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Introduction
Applications of interpretable Machine Learning to physical systems. Development of the Bayesian Machine Scientist.
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March 2017 - May 2020
February 2015 - January 2017
January 2008 - October 2012
Publications
Publications (156)
Closed-form, interpretable mathematical models have been instrumental for advancing our understanding of the world; with the data revolution, we may now be in a position to uncover new such models for many systems from physics to the social sciences. However, to deal with increasing amounts of data, we need “machine scientists” that are able to ext...
Ever since Nikuradse’s experiments on turbulent friction in 1933, there have been theoretical attempts to describe his measurements by collapsing the data into single-variable functions. However, this approach, which is common in other areas of physics and in other fields, is limited by the lack of rigorous quantitative methods to compare alternati...
Given a finite and noisy dataset generated with a closed-form mathematical model, when is it possible to learn the true generating model from the data alone? This is the question we investigate here. We show that this model-learning problem displays a transition from a low-noise phase in which the true model can be learned, to a phase in which the...
We present an agile, hardware independent analysis methodology based on the spectral windows technique to detect and quantify the environmental activity concentration of artificial isotopes of interest. The method removes counts from Compton scattering, peak overlapping, intrinsic background and other unconsidered contributions to the spectral regi...
We present a new procedure to remotely calibrate gamma spectrometry detectors installed in the open air used in surveillance networks. The procedure includes energy calibration, determination of the energy resolution and estimation of the activity concentration. Our Proportional ROI-Cleaning algorithm (Cerezo et al., 2023) has been applied to diffe...
Given a finite and noisy dataset generated with a closed-form mathematical model, when is it possible to learn the true generating model from the data alone? This is the question we investigate here. We show that this model-learning problem displays a transition from a low-noise phase in which the true model can be learned, to a phase in which the...
Closed-form, interpretable mathematical models have been instrumental for advancing our understanding of the world; with the data revolution, we may now be in a position to uncover new such models for many systems from physics to the social sciences. However, to deal with increasing amounts of data, we need "machine scientists" that are able to ext...
Ever since Nikuradse's experiments on turbulent friction in 1933, there have been theoretical attempts to describe his measurements by collapsing the data into single-variable functions. However, this approach, which is common in other areas of physics and in other fields, is limited by the lack of rigorous quantitative methods to compare alternati...
We report on the detection of flaring activity from the Fanaroff-Riley I radio galaxy NGC 1275 in very-high-energy (VHE, E $>$ 100 GeV) gamma rays with the MAGIC telescopes. Observations were performed between 2016 September and 2017 February as part of a monitoring program. The brightest outburst with $\sim1.5$ times the Crab Nebula flux above 100...
A search for tau neutrino induced showers with the MAGIC telescopes is presented. The MAGIC telescopes located at an altitude of 2200 m a.s.l. in the Canary Island of La Palma, can point towards the horizon or a few degrees below across an azimuthal range of about 80 degrees. This provides a possibility to search for air showers induced by tau lept...
A search for tau neutrino induced showers with the MAGIC telescopes is presented. The MAGIC telescopes located at an altitude of 2200 m a.s.l. in the Canary Island of La Palma, can point towards the horizon or a few degrees below across an azimuthal range of about 80°. This provides a possibility to search for air showers induced by tau leptons ari...
The very-high-energy (VHE, $\gtrsim 100$ GeV) $\gamma$-ray MAGIC observations of the blazar S4 0954+65, were triggered by an exceptionally high flux state of emission in the optical. This blazar has a disputed redshift of z=0.368 or z$\geqslant$0.45 and an uncertain classification among blazar subclasses. The exceptional source state described here...
The dwarf spheroidal galaxy Ursa Major II (UMaII) is believed to be one of the most dark-matter dominated systems among the Milky Way satellites and represents a suitable target for indirect dark matter (DM) searches. The MAGIC telescopes carried out a deep observation campaign on UMaII between 2014 and 2016, collecting almost one hundred hours of...
e-ASTROGAM (`enhanced ASTROGAM') is a breakthrough Observatory space mission, with a detector composed by a Silicon tracker, a calorimeter, and an anticoincidence system, dedicated to the study of the non-thermal Universe in the photon energy range from 0.3 MeV to 3 GeV - the lower energy limit can be pushed to energies as low as 150 keV, albeit wi...
e-ASTROGAM (‘enhanced ASTROGAM’) is a breakthrough Observatory space mission, with a detector composed by a Silicon tracker, a calorimeter, and an anticoincidence system, dedicated to the study of the non-thermal Universe in the photon energy range from 0.3 MeV to 3 GeV – the lower energy limit can be pushed to energies as low as 150 keV, albeit wi...
Spontaneous breaking of Lorentz symmetry at energies on the order of the Planck energy or lower is predicted by many quantum gravity theories, implying non-trivial dispersion relations for the photon in vacuum. Consequently, gamma-rays of different energies, emitted simultaneously from astrophysical sources, could accumulate measurable differences...
MAGIC (Major Atmospheric Gamma Imaging Cherenkov) is a system of two 17 m diameter, F/1.03 Imaging Atmospheric Cherenkov Telescopes (IACT). They are dedicated to the observation of gamma rays from galactic and extragalactic sources in the very high energy range (VHE, 30 GeV to 100 TeV). This submission contains links to the proceedings for the 35th...
The microquasar Cygnus X-1 displays the two typical soft and hard X-ray states of a black-hole transient. During the latter, Cygnus X-1 shows a one-sided relativistic radio-jet. Recent detection of the system in the high energy (HE; $E\gtrsim60$ MeV) gamma-ray range with \textit{Fermi}-LAT associates this emission with the outflow. Former MAGIC obs...
MAGIC, a system of two imaging atmospheric Cherenkov telescopes, achieves its best performance under dark conditions, i.e. in absence of moonlight or twilight. Since operating the telescopes only during dark time would severely limit the duty cycle, observations are also performed when the Moon is present in the sky. Here we develop a dedicated Moo...
It is widely believed that the bulk of the Galactic cosmic rays are accelerated in supernova remnants (SNRs). However, no observational evidence of the presence of particles of PeV energies in SNRs has yet been found. The young historical SNR Cassiopeia A (Cas A) appears as one of the best candidates to study acceleration processes. Between Decembe...
The microquasar V404 Cygni underwent a series of outbursts in 2015, June 15-31, during which its flux in hard X-rays (20-40 keV) reached about 40 times the Crab Nebula flux. Because of the exceptional interest of the flaring activity from this source, observations at several wavelengths were conducted. The MAGIC telescopes, triggered by the INTEGRA...
e-ASTROGAM ('enhanced ASTROGAM') is a breakthrough Observatory space mission, with a detector composed by a Silicon tracker, a calorimeter, and an anticoincidence system, dedicated to the study of the non-thermal Universe in the photon energy range from 0.3 MeV to 3 GeV – the lower energy limit can be pushed to energies as low as 150 keV, albeit wi...
B1957+20 is a millisecond pulsar located in a black widow type compact binary system with a low mass stellar companion. The interaction of the pulsar wind with the companion star wind and/or the interstellar plasma is expected to create plausible conditions for acceleration of electrons to TeV energies and subsequent production of very high energy...
MAGIC, a system of two imaging atmospheric Cherenkov telescopes, achieves its best performance under dark conditions, i.e. in absence of moonlight or twilight. Since operating the telescopes only during dark time would severely limit the duty cycle, observations are also performed when the Moon is present in the sky. Here we develop a dedicated Moo...
The extragalactic VHE gamma-ray sky is rich in blazars. These are jetted active galactic nuclei viewed at a small angle to the line-of-sight. Only a handful of objects viewed at a larger angle are known so far to emit above 100 GeV. Multi-wavelength studies of such objects up to the highest energies provide new insights into the particle and radiat...
In this work we present data from observations with the MAGIC telescopes of SN 2014J detected in January 21 2014, the closest Type Ia supernova since Imaging Air Cherenkov Telescopes started to operate. We probe the possibility of very-high-energy (VHE; $E\geq100$ GeV) gamma rays produced in the early stages of Type Ia supernova explosions. We perf...
We present the first detection of the nearby (z=0.084) low-luminosity BL Lac object 1ES 1741+196 in the very high energy (VHE: E>100 GeV) band. This object lies in a triplet of interacting galaxies. Early predictions had suggested 1ES 1741+196 to be, along with several other high-frequency BL Lac sources, within the reach of MAGIC detectability. It...
Imaging Atmospheric Cherenkov Telescopes (IACTs) represent a class of instruments which are dedicated to the ground-based observation of cosmic VHE gamma ray emission based on the detection of the Cherenkov radiation produced in the interaction of gamma rays with the Earth atmosphere. One of the key elements of such instruments is a pixelized focal...
We present an extensive study of the BL Lac object Mrk 501 based on a data set collected during the multi-instrument campaign spanning from 2009 March 15 to 2009 August 1 which includes, among other instruments, MAGIC, VERITAS, Whipple 10-m, Fermi-LAT, RXTE, Swift, GASP-WEBT and VLBA. We find an increase in the fractional variability with energy, w...
Imaging Atmospheric Cherenkov Telescopes (IACTs) represent a class of instruments which are dedicated to the ground-based observation of cosmic VHE gamma ray emission based on the detection of the Cherenkov radiation produced in the interaction of gamma rays with the Earth atmosphere. One of the key elements of such instruments is a pixelized focal...
We describe and report the status of a neutrino-triggered program in IceCube that generates real-time alerts for gamma-ray follow-up observations by atmospheric-Cherenkov telescopes (MAGIC and VERITAS). While IceCube is capable of monitoring the whole sky continuously, high-energy gamma-ray telescopes have restricted fields of view and in general a...
Context. We present the results of a multi-year monitoring campaign of the Galactic Center (GC) with the MAGIC telescopes. These observations were primarily motivated by reports that a putative gas cloud (G2) would be passing in close proximity to the super-massive black hole (SMBH), associated with Sagittarius A*, located at the center of our gala...
Blazars are variable emitters across all wavelengths over a wide range of timescales, from months down to minutes. It is therefore essential to observe blazars simultaneously at different wavelengths, especially in the X-ray and gamma-ray bands, where the broadband spectral energy distributions usually peak. In this work, we report on three "target...
e-ASTROGAM (`enhanced ASTROGAM') is a breakthrough Observatory mission dedicated to the study of the non-thermal Universe in the photon energy range from 0.3 MeV to 3 GeV. The mission is based on an advanced space-proven detector technology, with unprecedented sensitivity, angular and energy resolution, combined with polarimetric capability. In the...
Context. PKS 1510-089 is one of only a few flat spectrum radio quasars detected in the VHE (very-high-energy, > 100 GeV) gamma-ray band. Aims. We study the broadband spectral and temporal properties of the PKS 1510-089 emission during a high gamma-ray state. Methods. We performed VHE gamma-ray observations of PKS 1510-089 with the MAGIC telescopes...
The Cygnus Loop is a well-studied supernova remnant (SNR) that has been observed across the electromagnetic spectrum. Although widely believed to be an SNR shell with a blow- out region in the south, we consider the possibility that this object is two SNRs projected along the same line-of-sight by using multi-wavelength images and modelling. Our re...
Context. QSO B0218+357 is a gravitationally lensed blazar located at a redshift of 0.944. The gravitational lensing splits the emitted radiation into two components, spatially indistinguishable by gamma-ray instruments, but separated by a 10-12 day delay. In July 2014, QSO B0218+357 experienced a violent flare observed by the Fermi-LAT and followed...
SiPM photo detectors are nowadays commonly used in many applications. For large size telescopes like MAGIC or the future Large Size Telescope (LST) of the Cherenkov Telescope Array (CTA) project, a pixel size of some square centimeters is needed. An analog amplifier and sum stage was built and characterized. A large and compact SiPM matrix prototyp...
The Geminga pulsar, one of the brighest gamma-ray sources, is a promising candidate for emission of very-high-energy (VHE > 100 GeV) pulsed gamma rays. Also, detection of a large nebula have been claimed by water Cherenkov instruments. We performed deep observations of Geminga with the MAGIC telescopes, yielding 63 hours of good-quality data, and s...
Galactic cosmic rays reach energies of at least a few petaelectronvolts1 (of the order of 1015 electronvolts). This implies that our Galaxy contains petaelectronvolt accelerators (PeVatrons), but all proposed models of Galactic cosmic-ray accelerators encounter difficulties at exactly these energies2. Dozens of Galactic accelerators capable of acce...
Aims. We aim for an understanding of the morphological and spectral properties of the supernova remnant RCW 86 and for insights into the production mechanism leading to the RCW 86 very high-energy γ-ray emission. Methods. We analyzed High Energy Spectroscopic System (H.E.S.S.) data that had increased sensitivity compared to the observations present...
Massive star-forming regions assemble a large number of young stars with remnants of stellar evolution and a very dense environment. Therefore, particles accelerated in supernova remnants and pulsar wind nebulae encounter optimal conditions for interacting with target material and photon fields, and thus produce gamma-ray emission. However, observa...
In the past decade imaging atmospheric Cherenkov telescope arrays such as
H.E.S.S., MAGIC, VERITAS, as well as the Fermi-LAT space telescope have
provided us with detailed images and spectra of the {\gamma}-ray universe for
the first time. Currently the {\gamma}-ray community is preparing to build the
next-generation Cherenkov Telecope Array (CTA),...
The Cherenkov Telescope Array (CTA) is the the next generation facility of
imaging atmospheric Cherenkov telescopes; two sites will cover both
hemispheres. CTA will reach unprecedented sensitivity, energy and angular
resolution in very-high-energy gamma-ray astronomy. Each CTA array will include
four Large Size Telescopes (LSTs), designed to cover...
G349.7+0.2 is a young Galactic supernova remnant (SNR) located at the distance of 11.5 kpc and observed across the entire electromagnetic spectrum from radio to high energy (HE; 0.1 GeV < E < 100 GeV) γ-rays. Radio and infrared observations indicate that the remnant is interacting with a molecular cloud. In this paper, the detection of very high en...
Re-observations with the H.E.S.S. telescope array of the very-high-energy
(VHE) source HESS J1018-589 A coincident with the Fermi-LAT $\gamma$-ray binary
1FGL J1018.6-5856 have resulted in a source detection significance of more than
9$\sigma$, and the detection of variability ($\chi^2$/$\nu$ of 238.3/155) in
the emitted $\gamma$-ray flux. This var...
An annihilation signal of dark matter is searched for from the central region of the Milky Way. Data acquired in dedicated on-off observations of the Galactic center region with H.E.S.S. are analyzed for this purpose. No significant signal is found in a total of ∼9 h of on-off observations. Upper limits on the velocity averaged cross section, ⟨σv⟩,...
The Cygnus Loop is a nearby supernova remnant (SNR) observed across the
electromagnetic spectrum. With the analysis of 6 years of Fermi/LAT data we
find that, what previous studies had considered a single source, consists of an
extended source plus a point-like source south-east of the SNR. The extended
gamma-ray emission is well correlated with th...
The Large Magellanic Cloud, a satellite galaxy of the Milky Way, has been
observed with the High Energy Stereoscopic System (H.E.S.S.) above an energy of
100 billion electron volts for a deep exposure of 210 hours. Three sources of
different types were detected: the pulsar wind nebula of the most energetic
pulsar known N 157B, the radio-loud supern...
Very high energy (VHE, $E>$100 GeV) $\gamma$-ray flaring activity of the
high-frequency peaked BL Lac object \pg\ has been detected by the \hess\
telescopes. The flux of the source increased by a factor of 3 during the nights
of 2012 April 26 and 27 with respect to the archival measurements with hint of
intra-night variability. No counterpart of th...
The gamma-ray spectrum of the low-frequency-peaked BL Lac (LBL) object AP Librae is studied, following the discovery of very-high-energy (VHE; E > 100 GeV) gamma-ray emission up to the TeV range by the H.E.S.S. experiment. Thismakes AP Librae one of the few VHE emitters of the LBL type. The measured spectrum yields a flux of (8.8 +/- 1.5(stat) +/-...
Puppis A is an interesting ~4 kyr-old supernova remnant (SNR) that shows
strong evidence of interaction between the forward shock and a molecular cloud.
It has been studied in detail from radio frequencies to high-energy (HE,
0.1-100 GeV) gamma-rays. An analysis of the Fermi-LAT data has shown an
extended HE gamma-ray emission with a 0.2-100 GeV sp...
Diffuse $\gamma$-ray emission is the most prominent observable signature of
celestial cosmic-ray interactions at high energies. While already being
investigated at GeV energies over several decades, assessments of diffuse
$\gamma$-ray emission at TeV energies remain sparse. After completion of the
systematic survey of the inner Galaxy, the H.E.S.S....
Dwarf spheroidal galaxies of the Local Group are close satellites of the
Milky Way characterized by a large mass-to-light ratio and are not expected to
be the site of non-thermal high-energy gamma-ray emission or intense star
formation. Therefore they are amongst the most promising candidates for
indirect dark matter searches. During the last years...
In this paper we report on the analysis of all the available optical and very
high-energy $\gamma$-ray ($>$200 GeV) data for the BL Lac object PKS
2155$-$304, collected simultaneously with the ATOM and H.E.S.S. telescopes from
2007 until 2009. This study also includes X-ray (RXTE, Swift) and high-energy
$\gamma$-ray (Fermi-LAT) data. During the per...
This letter reports the discovery of a remarkably hard spectrum source, HESS
J1641-463, by the High Energy Stereoscopic System (H.E.S.S.) in the very-high
energy (VHE) domain. HESS J1641-463 remained unnoticed by the usual analysis
techniques due to confusion with the bright nearby source HESS J1640-465. It
emerged at a significance level of 8.5 st...
Previous observations with HESS have revealed the existence of an extended
very-high-energy (VHE; E>100 GeV) gamma-ray source, HESS J1834-087, coincident
with the SNR W41. The origin of the gamma-ray emission has been further
investigated with HESS and the Fermi-LAT. The gamma-ray data provided by 61h
(HESS) and 4 yrs (Fermi LAT) of observations co...
Context: Very-high-energy (VHE; E>100 GeV) {\gamma}-ray emission from blazars
inevitably gives rise to electron-positron pair production through the
interaction of these {\gamma}-rays with the Extragalactic Background Light
(EBL). Depending on the magnetic fields in the proximity of the source, the
cascade initiated from pair production can result...
This Letter reports the discovery of a remarkably hard spectrum source, HESS J1641-463, by the High Energy Stereoscopic System (H.E.S.S.) in the very high energy (VHE) domain. HESS J1641-463 remained unnoticed by the usual analysis techniques due to confusion with the bright nearby source HESS J1640-465. It emerged at a significance level of 8.5 st...
Context. The galaxy IC 310 has recently been identified as a $\gamma$-ray
emitter by the Fermi-LAT and at very high energies by the MAGIC telescopes.
Originally classified as a head-tail radio galaxy, the nature of this object is
subject of controversy because its nucleus shows blazar-like behavior. Aims. In
order to understand the nature of IC 310...
Context. On March 28, 2011, the BAT instrument on board the Swift satellite detected a new transient event that in the very beginning was classified as a gamma ray burst (GRB). However, the unusual X-ray flaring activity observed from a few hours up to days after the onset of the event made a different nature seem to be more likely. The long-lastin...
We present the observations of the W51 complex with the MAGIC
telescopes. After collecting more than 50 h of good quality data, we are
able to measure the energy spectrum between 75 GeV and 5.5 TeV, and to
fit it with a single power law with an index of 2. 58 ± 0.
07stat ± 0. 22syst. We look for underlying
structures by means of detailed morphologi...
Motivated by the Costamante & Ghisellini (2002) predictions we investigated
if the blazar 1ES 1727+502 (z=0.055) is emitting very high energy (VHE, E>100
GeV) gamma rays. We observed the BL Lac object 1ES 1727+502 in stereoscopic
mode with the two MAGIC telescopes during 14 nights between May 6th and June
10th 2011, for a total effective observing...
Supernova remnants are a probable site of acceleration of particles via diffusive shock processes. High energies carried by electrons or protons are radiated into photons detectable from radio to gamma rays. MAGIC has recently observed W51C, one of the most luminous galactic supernova remnants, and completed its spectrum between 50 GeV and 5 TeV. W...
The supernova remnant (SNR) W51C interacts with the molecular clouds of the star-forming region W51B, making the W51 complex one of the most promising targets to study cosmic ray acceleration. Gamma-ray emission from this region was discovered by Fermi/LAT and H.E.S.S., although its location was compatible with the SNR shell, the molecular cloud (M...
[Abridged] Context. To construct and interpret the spectral energy
distribution (SED) of BL Lacertae objects, simultaneous broad-band observations
are mandatory. Aims. We present the results of a dedicated multi-wavelength
study of the high-frequency peaked BL Lacertae (HBL) object and known TeV
emitter 1ES 2344+514 by means of a pre-organised camp...
Magnetars are an extreme, highly magnetized class of isolated neutron stars
whose large X-ray luminosity is believed to be driven by their high magnetic
field. In this work we study for the first time the possible very high energy
gamma-ray emission above 100 GeV from magnetars, observing the sources 4U
0142+61 and 1E 2259+586. We observed the two...
We analyze 3.5 years of public Fermi/LAT data around the position of the supernova remnant HB 21, where four point-like sources from the 2nd
Fermi/LAT catalog are located. We determine that the gamma-ray
source is produced by a single extended source. We model the observed morphology as a uniform circle. The spectral energy distribution is best d...
We present the results of a long M87 monitoring campaign in very high energy
$\gamma$-rays with the MAGIC-I Cherenkov telescope. We aim to model the
persistent non-thermal jet emission by monitoring and characterizing the very
high energy $\gamma$-ray emission of M87 during a low state. A total of 150\,h
of data were taken between 2005 and 2007 wit...
The high frequency peaked BL Lac PKS 2155-304 with a redshift of z=0.116 was
discovered in 1997 in the very high energy (VHE, E >100GeV) gamma-ray range by
the University of Durham Mark VI gamma-ray Cherenkov telescope in Australia
with a flux corresponding to 20% of the Crab Nebula flux. It was later observed
and detected with high significance by...
Galaxy clusters are being assembled today in the most energetic phase of hierarchical structure formation which manifests itself in powerful shocks that contribute to a substantial energy density of cosmic rays (CRs). Hence, clusters are expected to be luminous gamma-ray emitters since they also act as energy reservoirs for additional CR sources, s...
Context. We present the discovery of very high energy (VHE, E > 100 GeV) γ-ray emission from the BL Lac object 1ES 1215+303 by the MAGIC telescopes and simultaneous multi-wavelength data in a broad energy range from radio to γ-rays. Aims. We study the VHE γ-ray emission from 1ES 1215+303 and its relation to the emissions in other wavelengths. Metho...
The very high energy (VHE) \gamma-ray source HESS J0632+057 has recently been
confirmed to be a \gamma-ray binary. The optical counterpart is the Be star MWC
148, and a compact object of unknown nature orbits it every ~321 d with a high
eccentricity of ~0.8. We monitored HESS J0632+057 with the stereoscopic MAGIC
telescopes from 2010 October to 201...
Context. We present the discovery of very high energy (VHE, E > 100GeV)
gamma-ray emission from the BL Lac object 1ES 1215+303 by the MAGIC telescopes
and simultaneous multi-wavelength data in a broad energy range from radio to
gamma-rays. Aims. We study the VHE gamma-ray emission from 1ES 1215+303 and its
relation to the emissions in other wavelen...
The giant radio galaxy M 87 with its proximity (16 Mpc), famous jet, and very massive black hole ((3 – 6) × 109 M
☉) provides a unique opportunity to investigate the origin of very high energy (VHE; E > 100 GeV) γ-ray emission generated in relativistic outflows and the surroundings of supermassive black holes. M 87 has been established as a VHE γ-r...
The W51 complex hosts the supernova remnant W51C which is known to interact
with the molecular clouds in the star forming region W51B. In addition, a
possible pulsar wind nebula CXO J192318.5+140305 was found likely associated
with the supernova remnant. Gamma-ray emission from this region was discovered
by Fermi/LAT (between 0.2 and 50 GeV) and H....
We study the non-thermal jet emission of the BL Lac object B3 2247+381 during
a high optical state. The MAGIC telescopes observed the source during 13 nights
between September 30th and October 30th 2010, collecting a total of 14.2 hours
of good quality very high energy (VHE) $\gamma$-ray data. Simultaneous
multiwavelength data was obtained with X-r...
The giant radio galaxy M 87 with its proximity (16 Mpc), famous jet, and very massive black hole ((3-6) x 10(9) M-circle dot) provides a unique opportunity to investigate the origin of very high energy (VHE; E > 100 GeV) gamma-ray emission generated in relativistic outflows and the surroundings of supermassive black holes. M 87 has been established...
The MAGIC data center has recently introduced a new computing service, which is available to the whole collaboration. This service will be complemented with DataCooker, an analysis system currently in development. This system implements the MAGIC data analysis chain and integrates it in the data center infrastructure. DataCooker is designed to prov...
We report on the detection of very-high energy (VHE, E>100 GeV) gamma-ray
emission from NGC 1275, the central radio galaxy of the Perseus cluster of
galaxies. The source has been detected by the MAGIC telescopes with a
statistical significance of 6.6 sigma above 100 GeV in 46 hr of stereo
observations carried out between August 2010 and February 20...
We present very high energy (VHE, E > 100 GeV) {\gamma}-ray observations of
the {\gamma}-ray binary system LS I+61 303 obtained with the MAGIC stereo
system between 2009 October and 2010 January. We detect a 6.3{\sigma}
{\gamma}-ray signal above 400 GeV in the combined data set. The integral flux
above an energy of 300 GeV is F(E>300 GeV)=(1.4 +- 0...
Galaxy clusters are being assembled today in the most energetic phase of
hierarchical structure formation which manifests itself in powerful shocks that
contribute to a substantial energy density of cosmic rays (CRs). Hence,
clusters are expected to be luminous gamma-ray emitters since they also act as
energy reservoirs for additional CR sources, s...
We report on the observation of γ-rays above 25 GeV from the Crab pulsar (PSR B0532+21) using the MAGIC I telescope. Two data sets from observations during the winter period 2007/2008 and 2008/2009 are used. In order to discuss the spectral shape from 100 MeV to 100 GeV, one year of public Fermi Large Area Telescope (Fermi-LAT) data are also analyz...
Compilation of the papers contributed by the MAGIC collaboration to the 32nd
International Cosmic Ray Conference (ICRC 2011), which took place between
August 11 and 18, 2011 in Beijing, China. The papers are sorted in 6
categories: Overview and Highlight papers; Instrument, software and techniques;
Galactic sources; Extragalactic sources; Multi-wav...
The MAGIC Telescopes produce around 300 TBytes of raw data per year that
arepre-processed on-site at the Observatory Roque de los Muchachos, La
Palma, andthen transferred to the MAGIC Data Center at Barcelona, for
storage,processing and internal data access by MAGIC users. MAGIC Data
Center issupported by Institut de Física d'Altes Energies (IFAE),...
Located in a dense complex environment, W51C provides an excellent scenario to probe accelerated protons in SNRs and their interaction with surrounding target material. Here we report the observation of extended Very High Energy (VHE) gamma-ray emission from the W51C supernova remnant (SNR) with MAGIC. Detections of extended gamma-ray emission in t...
Located in a dense complex environment, W51C provides an excellent scenario to probe accelerated protons in SNRs and their interaction with surrounding target material. Here we report the observation of extended Very High Energy (VHE) gamma-ray emission from the W51C supernova remnant (SNR) with MAGIC. The VHE observations presented here, obtained...
We use 73 h of stereoscopic data taken with the MAGIC telescopes to
investigate the very high-energy (VHE) gamma-ray emission of the Crab pulsar.
Our data show a highly significant pulsed signal in the energy range from 50 to
400 GeV in both the main pulse (P1) and the interpulse (P2) phase regions. We
provide the widest spectra to date of the VHE...
We report on the observation of $\gamma$-rays above 25\,GeV from the Crab
pulsar (PSR B0532+21) using the MAGIC I telescope. Two data sets from
observations during the winter period 2007/2008 and 2008/2009 are used. In
order to discuss the spectral shape from 100\,MeV to 100\,GeV, one year of
public {\it Fermi} Large Area Telescope ({\it Fermi}-LAT...
MAGIC is a system of two Imaging Atmospheric Cherenkov Telescopes located in
the Canary island of La Palma. Since autumn 2009 both telescopes have been
working together in stereoscopic mode, providing a significant improvement with
respect to the previous single-telescope observations. We use observations of
the Crab Nebula taken at low zenith angl...