Antonios Manousakis

Antonios Manousakis
University of Sharjah | US · Department of Applied Physics

Ph.D. University of Geneva

About

67
Publications
5,250
Reads
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726
Citations
Citations since 2017
22 Research Items
451 Citations
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
Additional affiliations
September 2018 - August 2020
University of Sharjah
Position
  • Professor
July 2015 - September 2015
Polish Academy of Sciences
Position
  • supervision of 2 summer students
October 2012 - December 2018
Polish Academy of Sciences
Position
  • PostDoc Position
Education
September 2007 - December 2011
University of Geneva
Field of study
  • Astronomy and Astrophysics
October 2000 - November 2006
University of Crete
Field of study
  • Physics and Astronomy

Publications

Publications (67)
Article
Full-text available
THESEUS is a medium size space mission of the European Space Agency, currently under evaluation for a possible launch in 2032. Its main objectives are to investigate the early Universe through the observation of gamma-ray bursts and to study the gravitational waves electromagnetic counterparts and neutrino events. On the other hand, its instruments...
Article
Full-text available
THESEUS is a medium size space mission of the European Space Agency, currently under evaluation for a possible launch in 2032. Its main objectives are to investigate the early Universe through the observation of gamma-ray bursts and to study the gravitational waves electromagnetic counterparts and neutrino events. On the other hand, its instruments...
Conference Paper
Full-text available
Sharjah-Sat-1 is currently being developed as a collaborative research project among the Sharjah Academy for Astronomy, Space Sciences, and Technology (SAASST), University of Sharjah (UoS), Istanbul Technical University (ITU), and Sabanci University (SU). A 3U CubeSat design has been adopted with a dual payload onboard: (i) an improved X-ray Detect...
Preprint
THESEUS is a medium size space mission of the European Space Agency, currently under evaluation for a possible launch in 2032. Its main objectives are to investigate the early Universe through the observation of gamma-ray bursts and to study the gravitational waves electromagnetic counterparts and neutrino events. On the other hand, its instruments...
Preprint
Full-text available
High mass X-ray binaries are among the brightest X-ray sources in the Milky Way, as well as in nearby Galaxies. Thanks to their highly variable emissions and complex phenomenology, they have attracted the interest of the high energy astrophysical community since the dawn of X-ray Astronomy. In more recent years, they have challenged our comprehensi...
Article
Full-text available
High mass X-ray binaries are among the brightest X-ray sources in the Milky Way, as well as in nearby Galaxies. Thanks to their highly variable emissions and complex phenomenology, they have attracted the interest of the high energy astrophysical community since the dawn of X-ray Astronomy. In more recent years, they have challenged our comprehensi...
Article
Full-text available
Strong winds from massive stars are a topic of interest to a wide range of astrophysical fields, e.g., stellar evolution, X-ray binaries or the evolution of galaxies. Massive stars, as heavy as 10 to 20 solar masses, generate dense fast outflows that continuously supply their surroundings with metals, kinetic energy and ionizing radiation, triggeri...
Article
The All-sky Medium Energy Gamma-ray Observatory (AMEGO) is a probe class mission concept that will provide essential contributions to multimessenger astrophysics in the late 2020s and beyond. AMEGO combines high sensitivity in the 200 keV to 10 GeV energy range with a wide field of view, good spectral resolution, and polarization sensitivity. There...
Preprint
Full-text available
Supergiant X-ray binaries usually comprise a neutron star accreting from the wind of a OB supergiant companion. They are classified as classical systems and the supergiant fast X-ray transients (SFXTs). The different behavior of these sub-classes of sources in X-rays, with SFXTs displaying much more pronounced variability, is usually (at least) par...
Preprint
Full-text available
The All-sky Medium Energy Gamma-ray Observatory (AMEGO) is a probe class mission concept that will provide essential contributions to multimessenger astrophysics in the late 2020s and beyond. AMEGO combines high sensitivity in the 200 keV to 10 GeV energy range with a wide field of view, good spectral resolution, and polarization sensitivity. There...
Conference Paper
Full-text available
The SHARJAH-SAT-1 would be the first CubeSat mission to be developed by the Sharjah Academy for Astronomy, Space Sciences, and Technology (SAASST) students and researchers, with the aim of not only designing, fabricating, testing & launching the CubeSat itself, but also building the capacities and expertise for future SAASST CubeSat missions as wel...
Preprint
Full-text available
Vela X-1 is an eclipsing high mass X-ray binary (HMXB) consisting of a 283s accreting X-ray pulsar in a close orbit of 8.964 days around the B0.5Ib supergiant HD77581 at a distance of just 2.4 kpc. The system is considered a prototype of wind-accreting HMXB and it has been used as a baseline in different theoretical or modelling studies. We discuss...
Article
Enabled by the Fermi Large Area Telescope, we now know that pulsars fill the gamma-ray sky, and we are beginning to understand their emission mechanism and their distribution throughout the Galaxy. To address key questions calls for a sensitive, wide-field MeV telescope, which can detect the population of MeV-peaked pulsars hinted at by Fermi.
Preprint
Enabled by the Fermi Large Area Telescope, we now know young and recycled pulsars fill the gamma-ray sky, and we are beginning to understand their emission mechanism and their distribution throughout the Galaxy. However, key questions remain: Is there a large population of pulsars near the Galactic center? Why do the most energetic pulsars shine so...
Article
Full-text available
In this White Paper we present the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies related to Observatory Science targets. These include flaring stars, supernova remnants, accreting white dwarfs, low and high mass X-ray binaries, radio quiet and radio loud active galactic nuclei, tidal disruption events, and gamma-...
Article
In this paper we present the science potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies of strongly magnetized objects. We will focus on the physics and astrophysics of strongly magnetized objects, namely magnetars, accreting X-ray pulsars, and rotation powered pulsars. We also discuss the science potential of eXTP fo...
Article
p>In this paper we describe the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies related to accretion flows in the strong field gravity regime around both stellar-mass and supermassive black-holes. eXTP has the unique capability of using advanced “spectral-timing-polarimetry” techniques to analyze the rapid variatio...
Preprint
Full-text available
In this paper we describe the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies related to accretion flows in the strong field gravity regime around both stellar-mass and supermassive black-holes. eXTP has the unique capability of using advanced 'spectral-timing-polarimetry' techniques to analyze the rapid variations...
Article
Full-text available
We simulate an oscillating polytropic torus with constant specific angular momentum around a Schwarzschild black hole. The goal is to search for quasi-periodic oscillations in the light curve of the torus. The torus is subjected to an initial radial, vertical or diagonal (combination of radial and vertical) velocity perturbation. The hydrodynamical...
Article
Full-text available
Strong winds from massive stars are a topic of interest to a wide range of astrophysical fields. In High-Mass X-ray Binaries the presence of an accreting compact object on the one side allows to infer wind parameters from studies of the varying properties of the emitted X-rays; but on the other side the accretor’s gravity and ionizing radiation can...
Article
In this paper we report on a long multi-wavelength observational campaign of the supergiant fast X-ray transient prototype IGR J17544-2619. A 150 ks-long observation was carried out simultaneously with XMM-Newton and NuSTAR, catching the source in an initial faint X-ray state and then undergoing a bright X-ray outburst lasting about 7 ks. We studie...
Conference Paper
Full-text available
The Large Observatory For x-ray Timing (LOFT) is a mission concept which was proposed to ESA as M3 and M4 candidate in the framework of the Cosmic Vision 2015-2025 program. Thanks to the unprecedented combination of effective area and spectral resolution of its main instrument and the uniquely large field of view of its wide field monitor, LOFT wil...
Article
T CrB is a symbiotic recurrent nova known to exhibit active phases, characterised by apparent increases in the hot component temperature and the appearance of flickering, i.e. changes in the observed flux on the time-scale of minutes. Historical UV observations have ruled out orbital variability as an explanation for flickering and instead suggest...
Conference Paper
Full-text available
We have modeled hydrodynamical tori in the Klu{\'z}niak-Lee pseudo-Newtonian potential. The tori in equilibrium were perturbed with uniform sub-sonic velocity fields: vertical, radial and diagonal respectively, and allowed to evolve in time. We identify the eigenmodes corresponding to those of slender tori. The results of our simulations are releva...
Article
Full-text available
We performed axisymmetric hydrodynamic simulations of perturbed tori orbiting a black hole. The tori in equilibrium were constructed with a constant distribution of angular momentum in a pseudo-Newtonian potential (Klu{\'z}niak-Lee). Epicyclic motions were triggered by adding sub-sonic velocity fields: radial, vertical and diagonal to the tori in e...
Article
Full-text available
We simulate an oscillating purely hydrodynamical torus with constant specific angular mo- mentum around a Schwarzschild black hole. The goal is to search for quasi-periodic oscil- lations (QPOs) in the light curve of the torus. The initial torus setup is subjected to radial, vertical and diagonal (combination of radial and vertical) velocity pertur...
Article
Full-text available
The early acceleration of stellar winds in massive stars is poorly constrained. The scattering of hard X-ray photons emitted by the pulsar in the high-mass X-ray binary Vela X-1 can be used to probe the stellar wind velocity and density profile close to the surface of its supergiant companion HD 77581. We built a high signal-to-noise and high resol...
Article
Full-text available
This is a White Paper in support of the mission concept of the Large Observatory for X-ray Timing (LOFT), proposed as a medium-sized ESA mission. We discuss the potential of LOFT for the study of active galactic nuclei. For a summary, we refer to the paper.
Article
Full-text available
This is a White Paper in support of the mission concept of the Large Observatory for X-ray Timing (LOFT), proposed as a medium-sized ESA mission. We discuss the potential of LOFT for the study of high-mass X-ray binaries and ultra-luminous X-ray sources. For a summary, we refer to the paper.
Article
Full-text available
$Context$: Vela X-1 is the prototype of the classical sgHMXB systems. Recent continuous and long monitoring campaigns revealed a large hard X-rays variability amplitude with strong flares and off-states. This activity has been interpreted invoking clumpy stellar winds and/or magnetic gating mechanisms. $Aims$: We are probing if the observed behavio...
Article
Full-text available
Supergiant High Mass X-ray Binary systems (sgHMXBs) consist of a massive, late type, star and a neutron star. The massive stars exhibits strong, radiatively driven, stellar winds. Wind accretion onto compact object triggers X-ray emission, which alters the stellar wind significantly. Hydrodynamic simulation has been used to study the neutron star -...
Article
Supergiant High Mass X-ray Binary systems (sgHMXBs) consist of a massive, late type, star and a neutron star. The massive stars exhibit strong, radiatively driven, stellar winds. Wind accretion onto compact object triggers X-ray emission, which alters the stellar wind significantly. Hydrodynamic simulation has been used to study the neutron star -...
Article
Full-text available
Context. A population of obscured supergiant high mass X-ray binaries has been discovered by INTEGRAL. X-ray wind tomography of IGR J17252-3616 inferred a slow wind velocity to account for the enhanced obscuration. Aims: The main goal of this study is to understand under which conditions high obscuration could occur. Methods: We have used an hydrod...
Article
Full-text available
The LOFT mission concept is one of four candidates selected by ESA for the M3 launch opportunity as Medium Size missions of the Cosmic Vision programme. The launch window is currently planned for between 2022 and 2024. LOFT is designed to exploit the diagnostics of rapid X-ray flux and spectral variability that directly probe the motion of matter d...
Article
Full-text available
We report on all the INTEGRAL and Swift data collected during the first outburst observed from IGRJ18179-1621. The broad-band spectral analysis showed that the X-ray emission from the source is heavily absorbed (N_H~10^23 cm^-2), and well described by a flat power-law with a high energy rollover (cutoff energy 9-12 keV, e-folding energy 4-7 keV). W...
Article
Persistently highly-absorbed High-Mass X-Ray Binary systems provide new insights on the accretion flow and on the wind of massive stars. We report on observations and hydrodynamical simulations of the system IGR J17252-3616. The comparison of the simulation results with the detailled observations with INTEGRAL and XMM-Newton along the orbit allow t...
Article
Following the discovery of the new hard X-ray transient IGR J17494-3030 with INTEGRAL (Atel #3984, #3985), a follow-up observation has been performed with Swift on 2012 March 20 at 15:04 UTC (total exposure time 1 ks). A single object is detected within the JEM-X error circle. The best determined Swift/XRT position (90% c.l.) is at: RA=267.3491 D...
Article
Hard X-ray monitoring observations by INTEGRAL of the Norma Arm region show that the X-ray binary and black-hole candidate 4U 1630-47 has brightened in the hard X-rays (>18 keV) which could indicate the start of a possible state transition since its X-ray outburst of 2011 December (ATel #3830). During INTEGRAL revolution 1143 (2012 Feb. 22), 4U 163...
Article
Full-text available
INTEGRAL played a key role in discovering obscured sgHMXB in the Galaxy. We used XMM-Newton to perform X-ray wind tomography of a specific of these systems, IGR J17252-3616, featuring eclipses of the accreting pulsar. The X-ray band (0.2-10 keV) reveals vital information on the geometry of the surrounding gas probing simultaneously the absorption a...
Article
Full-text available
AX J1910.7+0917 is a still unidentified source discovered with ASCA and observed more recently with IBIS/ISGRI, mainly noticeable for its rather hard spectrum. We analyzed all the public available data on this source, and we took advantage of the recent improvements performed in the INTEGRAL data analysis software to fully exploit the IBIS/ISGRI da...
Article
Full-text available
We take advantage of the high sensitivity of the IBIS/ISGRI telescope and the improvements in the data analysis software to investigate the nature of the still poorly known X-ray source AX J1910.7+0917, and search for close-by previously undetected objects. We analyze all publicly available INTEGRAL data of AX J1910.7+0917, together with a number o...
Article
Full-text available
Our goal is to understand the specificities of highly absorbed sgHMXB and in particular of the companion stellar wind, thought to be responsible for the strong absorption. We have monitored IGR J17252-3616, a highly absorbed system featuring eclipses, with XMM-Newton to study the vari- ability of the column density and of the Fe K{\alpha} emission...
Article
Full-text available
IGR J17252-3616 is an heavily absorbed and eclipsing High Mass X-ray Binary with an ab-sorbing hydrogen column density >1023 cm-2 . We have observed it with XMM-Newton to understand the geometry of the absorbing material. Observations were scheduled in order to cover as many orbital phases as possible. Timing analysis is constraining the orbital so...
Article
The latest RXTE observations of XTEJ1752-223 detected this source in an intermediate state, and suggested that a spectral transition from the soft to the hard state was most likely taking place (Atel #2518). Following this announcement, we analyzed the INTEGRAL data of the latest revolutions in the direction of the source. In the period preceding t...
Article
The recurrent Nova U Sco was discovered in outburst on 28 January 2010 (http://www.aavso.org/publications/alerts/alert415.shtml). From 2010-01-28 17:01:43 to 2010-01-29 05:10:01 (exposure time ~45 ks), INTEGRAL was observing the field around Sco X-1 (PI M. Revnivtsev), and U Sco was inside the IBIS/ISGRI and JEMX-2 fields of view. The source was no...
Article
Full-text available
Aims. Soft X-ray excesses have been detected in several Be/X-ray binaries and interpreted as the signature of hard X-ray reprocessing in the inner accretion disk. The system XMMU J054134.7-682550, located in the LMC, featured a giant Type II outburst in August 2007. The geometry of this system can be understood by studying the response of the soft...
Article
INTEGRAL observed the Be/X-ray binary pulsar 1A 0535+262 at large off-axis angle (> 15 degrees) between 2009-08-03T00:53 and 2009-08-04T04:32 for 11 ksec. The observation confirms the new outburst reported by Finger et al. (ATel #2142). The average flux of the source during the observation measured by INTEGRAL IBIS/ISGRI was 318+-11 mCrab (20-40 ke...
Article
We report on the first detection of the Be star HMXBs GX 304-1 and H 1417-624 above 20 keV with the IBIS/ISGRI X-ray imager on board INTEGRAL. From 2008-06-24 to 2008-07-09, INTEGRAL performed monitoring observations of the Galactic plane around l=305 degrees for a total exposure time of 352 ksec. GX 304-1 was detected in all spacecraft revolutions...
Article
We report the discovery of a optical nova in M31 on four consecutive dithered R filter CCD images obtained on (2007 July 19.00741, 19.00890, 19.01041, 19.01193, with corresponding R magnitudes of 18.8, 18.7, 18.8, 18.5) obtained at the 1.3m Ritchey Chretien f/7.5 telescope at Skinakas Observatory, Crete, Greece, using an Andor DZ436-BV CCD Camera (...
Article
The high-mass X-ray binary SAX J2103.5+4545 was observed from Skinakas observatory (Crete) on 2007 May 14 (UT 22:24) and 20 (UT 22:12). The H alpha line showed a double-peak profile and weak emission with equivalent width 2.5+-0.2 and 1.9+-0.2 angstrom, respectively. This is the first report of H alpha emission since 2003 August. The optical activi...
Article
Full-text available
Classical novae are quite frequent in M~31. However, very few spectra of M31 novae have been studied to date, especially during the early decline phase. Our aim is to study the photometric and spectral evolution of a M31 nova event close to outburst. We present photometric and spectroscopic observations of M31N 2005-09c, a classical nova in the dis...
Article
We carried out spectroscopic observations of the optical transient near M31 reported in ATel #611 (RA = 00h38m54.63s DEC =+40o27'34.2" (J2000)) from the 1.3m telescope of the Skinakas Observatory in Crete (Greece) on the nights 28 and 29 September 2005. The spectra covered the range 3800-7000 angstroms. All the lines of the Balmer series up to H-8...
Article
Full-text available
We present the results of our search for optical counterparts to high-mass X-ray transient sources discovered by various X-ray missions. We obtained CCD images of the X-ray fields through BVR and Halpha filters in order to identify early-type stars in the R-Halpha versus B-V colour-colour diagram. We also obtained medium-resolution spectroscopy of...
Article
After the submission of ATel #339 a few formatting inconsistencies and some missing/incorrect information were spotted. This is the corrected version of ATel #339. It also contains new information concerning the association of the proposed counterpart with the Halpha emission line star [KW97] 6-30. We report photometric and spectroscopic optical ob...
Article
After the discovery of the new INTEGRAL source IGRJ16442-554 (Atel #2185), a Swift follow-up was requested. Swift/XRT observed IGRJ16442-554 on 2009-09-02 at 14:09:58 UT, for a total exposure time of 5 ks. Only one source was detected within the INTEGRAL/ISGRI error box. The refined source position is: RA: 16 44 38.15 DEC: -55 50 45.93 (J2000) with...

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