Julia Pye

• BA social policy health and housing
• Professor (Associate) at Edge Hill University

Context. With a temperature of ∼285 K, WISEJ0855–0714 (hereafter, WISE 0855) is the coldest brown dwarf observed thus far. Studying such cold gas giants allows us to probe the atmospheric physics and chemistry of evolved objects that resemble Solar System gas giants. Aims. Using James Webb Space Telescope (JWST), we obtained observations to charact...

Introduction Sleep-wake disturbances are a commonly reported non-motor symptom in dementia with Lewy bodies patients (DLB). Wrist actigraphy offers a low-burden, cost-effective option to measure sleep disturbances and has demonstrated alterations in rest-activity patterns in other synucleinopathies. This study reports both parametric and non-parame...

Dusty star-forming galaxies (DSFGs) at z > 2 have been commonly observed in overdense regions, where the merging processes and large halo masses induce rapid gas accretion, triggering star formation rates (SFRs) up to ∼1000 M ⊙ yr ⁻¹ . Despite the importance of these DSFGs for understanding star formation in the early Universe, their stellar distri...

With a temperature of $\sim 285$ K WISE0855 is the coldest brown dwarf observed so far. Using the James Webb Space Telescope (JWST) we obtained observations that allow us to characterize WISE0855s atmosphere focusing on vertical variation in the water steam abundance, measuring trace gas abundances and receiving bulk parameters for this cold object...

Thanks to decades of observations using HST, the structure of galaxies at redshift $z>2$ has been widely studied in the rest-frame ultraviolet regime, which traces recent star formation from young stellar populations. But, we still have little information about the spatial distribution of the older, more evolved, stellar populations, constrained by...

By using an ultradeep JWST/MIRI image at 5.6 μ m in the Hubble eXtreme Deep Field, we constrain the role of strong H α emitters (HAEs) during “cosmic reionization” at z ≃ 7–8. Our sample of HAEs is comprised of young (<35 Myr) galaxies, except for one single galaxy (≈300 Myr), with low stellar masses (≲10 ⁹ M ⊙ ). These HAEs show a wide range of re...

Context. ExoplANETS-A is an EU Horizon-2020 project with the primary objective of establishing new knowledge on exoplanet atmospheres. Intimately related to this topic is the study of the host stars’ radiative properties in order to understand the environment in which exoplanets lie. Aims. The aim of this work is to exploit archived data from space...

We present MIRI/JWST medium-resolution spectroscopy (MRS) and imaging (MIRIM) of the lensed galaxy MACS1149-JD1 at a redshift of $z$\,=\,9.1092pm 0.0002, when the Universe was about 530 Myr old. We detect, for the first time, spatially resolved Halpha emission in a galaxy at a redshift above nine. The structure of the Halpha emitting gas consists o...

Brown dwarfs serve as ideal laboratories for studying the atmospheres of giant exoplanets on wide orbits, as the governing physical and chemical processes within them are nearly identical1,2. Understanding the formation of gas-giant planets is challenging, often involving the endeavour to link atmospheric abundance ratios, such as the carbon-to-oxy...

Background Rest-activity rhythm disturbance is common in older adults ‘at risk’ for dementia. This may be an early marker of underlying disease pathology and risk of future decline. However, our understanding of how rest-activity rhythm relates to brain integrity remains unclear. Methods This study used vertex-wise analyses to examine the associat...

We make use of JWST medium-band and broadband NIRCam imaging, along with ultradeep MIRI 5.6 μ m imaging, in the Hubble eXtreme Deep Field to identify prominent line emitters at z ≃ 7–8. Out of a total of 58 galaxies at z ≃ 7–8, we find 18 robust candidates (≃31%) for (H β + [O iii ]) emitters, based on their enhanced fluxes in the F430M and F444W f...

Luminous infrared galaxies at high redshifts ( z > 4) include extreme starbursts that build their stellar mass over short periods of time, that is, of 100 Myr or less. These galaxies are considered to be the progenitors of massive quiescent galaxies at intermediate redshifts ( z ∼ 2) but their stellar structure and buildup is unknown. Here, we pres...

Luminous infrared galaxies at high redshifts ($z$>4) include extreme starbursts that build their stellar mass over short periods of time (>100 Myr). These galaxies are considered to be the progenitors of massive quiescent galaxies at intermediate redshifts ($z\sim$2) but their stellar structure and buildup is unknown. Here, we present the first spa...

The JWST is revolutionizing the study of high-redshift galaxies by providing for the first time a high-sensitivity view of the early Universe at infrared wavelengths, both with its Near Infrared Camera (NIRCam) and Mid Infrared Instrument (MIRI). In this paper, we make use of medium and broad-band NIRCam imaging, as well as ultra-deep MIRI 5.6 micr...

Using MIRI on-board JWST we present mid-infrared sub-arcsec imaging (MIRIM) and spectroscopy (MRS) of the hyperluminous infrared system SPT0311-58 at z=6.9. MIRI observations are compared with existing ALMA far-infrared continuum and [CII]158$\mu$m imaging. Even though the ALMA observations suggests very high star formation rates (SFR) in the easte...

We present a new prospective analysis of deep multi-band imaging with the James Webb Space Telescope (JWST). In this work, we investigate the recovery of high-redshift 5 < z < 12 galaxies through extensive image simulations of accepted JWST programs, including the Early Release Science in the EGS field and the Guaranteed Time Observations in the HU...

We present a new prospective analysis of deep multi-band imaging with the James Webb Space Telescope (JWST). In this work, we investigate the recovery of high-redshift $5<z<12$ galaxies through extensive image simulations of accepted JWST programs such as CEERS in the EGS field and HUDF GTO. We introduce complete samples of $\sim300,000$ galaxies w...

Health and social care professionals are required to work together to deliver person-centered care. Professionals therefore find themselves making decisions within multidisciplinary teams. For educators, there has been a call to bring students from differing professions together to learn to enable more effective teamwork, interprofessional communic...

PDS 70 is a $\sim$5 Myr old star with a gas and dust disc in which several proto-planets have been discovered. We present the first UV detection of the system along with X-ray observations taken with the \textit{Neil Gehrels Swift Observatory} satellite. PDS 70 has an X-ray flux of 3.4$\times 10^{-13}$ erg cm$^{-2}$ s$^{-1}$ in the 0.3-10.0 keV ran...

The James Webb Space Telescope (JWST) will provide deep imaging and spectroscopy for sources at redshifts above 6, covering the entire Epoch of Reionization (EoR, 6 < z < 10), and enabling the detailed exploration of the nature of the different sources during the first 1 Gyr of the history of the Universe. The Medium Resolution Spectrograph (MRS) o...

Context. Quasi-periodic pulsations (QPPs) are time variations in the energy emission during a flare that are observed on both the Sun and other stars and thus have the potential to link the physics of solar and stellar flares. Aims. We characterise the QPPs detected in an X-ray flare on the solar analogue, EK Draconis, which was observed by XMM-New...

Context. Quasi-periodic pulsations (QPPs) are time variations in the energy emission during a flare that are observed on both the Sun and other stars and thus have the potential to link the physics of solar and stellar flares. Aims. To characterise the QPPs detected in an X-ray flare on the solar analogue, EK Draconis, which was observed by XMM-New...

The James Webb Space Telescope will provide deep imaging and spectroscopy for sources at redshifts above 6, covering the Epoch of Reionization (EoR, 6 < z < 10). The Mid-IR instrument (MIRI) integral field spectrograph (MRS) will be the only instrument onboard JWST able to observe the brighest optical emission lines H$\alpha$ and [OIII]0.5007$\mu$m...

The primary objectives of the ExoplANETS-A project are to: establish new knowledge on exoplanet atmospheres; establish new insight on influence of the host star on the planet atmosphere; disseminate knowledge, using online, web-based platforms. The project, funded under the EU's Horizon-2020 programme, started in January 2018 and has a duration ~3...

We present soft x-ray observations made with the Einstein Observatory Imaging Proportional Counter (IPC) of IC443, W44 and W49B (for details of the observatory and instruments see Giacconi et al. 1979). The x-ray emission from IC443 and W44 is clearly concentrated within the interior of the remnant with little or no evidence for a limb-brightened s...

Introduction Previous systematic reviews and meta-analyses have identified cognitive deficits in adults with obstructive sleep apnoea (OSA). However, quantitative analysis of the association between OSA and neuropsychological performance has not been conducted specifically in older adults, for whom there is a greater risk of cognitive decline. Met...

Evidence of executive dysfunction in autism spectrum disorders (ASD) across development remains mixed and establishing its role is critical for guiding diagnosis and intervention. The primary objectives of this meta-analysis is to analyse executive function (EF) performance in ASD, the fractionation across EF subdomains, the clinical utility of EF...

This case report is the first published description of a minimally invasive transurethral endoscopic-guided approach to repair multiple bladder tears in a standing mare. The mare was diagnosed with a ruptured bladder 48 h post-partum based on clinical signs, transabdominal ultrasonography, serum and peritoneal fluid analysis, and cystoscopy. Under...

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...

The determination of galaxy redshifts in James Webb Space Telescope (JWST)'s blank-field surveys will mostly rely on photometric estimates, based on the data provided by JWST's Near-Infrared Camera (NIRCam) at 0.6-5.0 {\mu}m and Mid Infrared Instrument (MIRI) at {\lambda}>5.0 {\mu}m. In this work we analyse the impact of choosing different combinat...

The determination of galaxy redshifts in James Webb Space Telescope (JWST)'s blank-field surveys will mostly rely on photometric estimates, based on the data provided by JWST's Near-Infrared Camera (NIRCam) at 0.6-5.0 {\mu}m and Mid Infrared Instrument (MIRI) at {\lambda}>5.0 {\mu}m. In this work we analyse the impact of choosing different combinat...

The thermoelectric transport properties of a rectangular Aharonov-Bohm ring at low temperature are investigated using a theoretical approach based on Green's functions. The oscillations in the transmission coefficient as the field is varied can be used to tune the thermoelectric response of the ring. Large magnitude thermopowers are obtainable whic...

Patient experience is increasingly used as an indicator of high quality care in addition to more traditional clinical end-points. Surveys are generally accepted as appropriate methodology to capture patient experience. No validated patient experience surveys exist specifically for adolescents and young adults (AYA) aged 13-24 years at diagnosis wit...

Thin-film resonant absorbers for the far-IR spectral range were fabricated, characterized, and modeled. The 3-μm-thick structure comprises a periodic surface array of metal squares, a dielectric spacer and a metallic ground plane. Up to 95% absorption for the fundamental band at ~53.5μm wavelength (5.6 THz) is achieved experimentally. Absorption ba...

The Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST) provides measurements over the wavelength range 5 to 28.5 microns. MIRI has, within a single 'package', four key scientific functions: photometric imaging, coronagraphy, single-source low-spectral resolving power (R ~ 100) spectroscopy, and medium-resolving power (R ~ 1500...

We present estimates of cool-star X-ray flare rates determined from the XMM-Tycho survey (Pye et al . 2015, A&A, 581, A28), and compare them with previously published values for the Sun and for other stellar EUV and white-light samples. We demonstrate the importance of applying appropriate corrections, especially in regard to the total, effective s...

Patient experience is increasingly used as an indicator of high quality care in addition to more traditional clinical end-points. Surveys are generally accepted as appropriate methodology to capture patient experience. No validated patient experience surveys exist specifically for adolescents and young adults (AYA) aged 13-24 years at diagnosis wit...

The X-ray emission from flares on cool (i.e. spectral-type F-M) stars is indicative of very energetic, transient phenomena, associated with energy release via magnetic reconnection. We present a uniform, large-scale survey of X-ray flare emission. The XMM-Newton Serendipitous Source Catalogue and its associated data products provide an excellent ba...

Thanks to the large collecting area (3 x ~1500 cm$^2$ at 1.5 keV) and wide field of view (30' across in full field mode) of the X-ray cameras on board the European Space Agency X-ray observatory XMM-Newton, each individual pointing can result in the detection of hundreds of X-ray sources, most of which are newly discovered. Recently, many improveme...

Coherent, i.e., ballistic, thermoelectric transport in electron waveguide structures containing right-angle bends in single, double, and U-bend configurations is investigated. A theory based on Green&apos;s functions is used to derive the transmission function (and from that the transport coefficients) and allows for the inclusion of realistic mode...

Magnesium (Mg) supplementation has shown to modulate the stress responses to transport in other species. An experiment was designed to evaluate the effect of Mg for alleviating stress associated with road transportation in lambs. Two groups (n = 18 each) of 4-month old male crossbred lambs (24 ± 4.5 kg) were fed a basal diet comprising oaten hay, p...

The majority of active galactic nuclei (AGN) are obscured by large amounts of absorbing material that makes them invisible at many wavelengths. X-rays, given their penetrating power, provide the most secure way for finding these AGN. The XMM-Newton serendipitous source catalog is the largest catalog of X-ray sources ever produced; it contains about...

We analyse how the area swept out by a Brownian motion up to its first passage time correlates with the first passage time itself, obtaining several exact results in the process. Additionally, we analyse the relationship between the time average of a Brownian motion during a first passage and the maximum value attained. The results, which find vari...

Hospitals are now faced with delivering value-based care (high quality patient care at a reduced cost) rather than volume-based care. To investigate the impact of IT on value-creation in health care, we identify and theorize how the extent of use and rate of growth in use for three HIT capabilities (Clinical Process Management, Patient Engagement,...

Sustainability has emerged as a key area of interest in response to a growing concern surrounding the adverse effects of pollution, such as climate change and health problems. Given these concerns, firms need to re-evaluate their traditional bottom line measures. We conceptualize production/distribution technologies (PDTs) and sense-making technolo...

Tables 8-33 list the X-ray sources detected in the 26 different fields observed in this study, with their X-ray parameters and optical and infrared counterparts. (27 data files).

Many different classes of X-ray sources contribute to the Galactic landscape at high energies. Although the nature of the most luminous X-ray emitters is now fairly well understood, the population of low-to-medium X-ray luminosity (Lx = 10^27-10^34 erg/s) sources remains much less studied, our knowledge being mostly based on the observation of loca...

The JWST Mid Infrared Instrument (MIRI) operates in the 5-28μm wavelength range and can be configured for imaging, coronographic imaging, long-slit, low-resolution spectroscopy or medium resolution spectroscopy with an integral field unit. SCASim is one of a suite of simulators which operate together to simulate all the different modes of the in...

This summary reports on papers presented at the Cool Stars-16 meeting in the splinter session "Solar and Stellar flares." Although many topics were discussed, the main themes were the commonality of interests, and of physics, between the solar and stellar flare communities, and the opportunities for important new observations in the near future.

Two observational campaigns were carried out during the eclipses of EE Cep in 2003 and 2008/9 to verify whether the eclipsing body in the system is indeed a dark disk and to understand the observed changes in the depth and durations of the eclipses. Multicolour photometric data and spectroscopic observations at both low and high resolution were col...

This summary reports on papers presented at the Cool Stars-16 meeting in the splinter session "Solar and Stellar flares." Although many topics were discussed, the main themes were the commonality of interests, and of physics, between the solar and stellar flare communities, and the opportunities for important new observations in the near future.

The XMM-Newton 2XMM Serendipitous Source Catalogue is being used as the basis for a survey of stellar X-ray flares. As 2XMM (and its successive Data Releases) is the largest X-ray-source catalogue to date, and as X-ray light-curves are produced as standard data products, the catalogue provides an excellent basis for a comprehensive and sensitive su...

Introduction Department of Health published guidance on ‘Improving Outcomes in Upper Gastro-intestinal cancer’ in January 2001.1 One of the important recommendations was ‘Fast Track Endoscopy’ service within 2 weeks for patients with suspicion of cancer (‘the 2 weeks rule’). Our aim was to compare the detection of curative Upper GI cancers (Oesopha...

At fast rotation rates, the coronal activity of G- and K-type stars has been observed to ‘saturate’ and then decline again at even faster rotation rates – a phenomenon dubbed ‘supersaturation’. In this paper, we investigate coronal activity in fast-rotating M-dwarfs using deep XMM–Newton observations of 97 low-mass stars of known rotation period in...

Jo Pye, Director of Insights for Mintel in Asia Pacific speaks about fast moving consumer goods (FMCG) innovation in the foods, beverages and personal care sectors. Topics covered include the scale of global innovation, innovation myths and the four pillars of global innovation: Health and Wellness, Premiumisation, Convenience and Environmental, wh...

We report on a large stellar flare from the nearby dMe flare star EV Lac observed by the Swift and Konus-Wind satellites and the Liverpool Telescope. It is the first large stellar flare from a dMe flare star to result in a Swift trigger based on its hard X-ray intensity. Its peak fX from 0.3 to 100 keV of 5.3 × 10–8 erg cm–2 s–1 is nearly 7000 time...

The light reflected from many scarab beetles is strongly circularly polarized, a phenomenon that may be unique in nature. Approximately 1500 genera and more than 19 000 species/subspecies of scarab beetles (Scarabaeoidea) in the collection of the Natural History Museum, London, were surveyed with circularly polarizing filters to assess how widespre...

The photometric and spectroscopic observational campaign organized for the 2008/9 eclipse of EE Cep revealed features, which indicate that the eclipsing disk in the EE Cep system has a multi-ring structure. We suggest that the gaps in the disk can be related to the possible planet formation. Comment: 6 pages, 6 figures, contribution to the conferen...

Constant frequency echolocation signals of the Rhinolophidae and Hipposideridae have generally been found to occupy narrow bands, at least within single populations. Examination of three species of Hipposideridae from a cave in Kenya shows a wide spread of frequencies in each case. In Hipposideros commersoni the pulses occur in two bands at 56 and...

Two hundred women with breast cysts proven by aspiration were entered into a randomized double-blind trial of evening primrose oil (Efamol) at a dose of 3 g daily by mouth or placebo for a year. Neither the number of patients developing recurrent cysts nor the total numbers of recurrent cysts were significantly reduced in the Efamol treated group c...

The skulls, temporal bones and cochleas of some insect-eating night-feeding bats have been examined. The minute structure of the cochlea is considered with regard to the use of ultrasonic waves and their echoes for locating obstacles and prey in complete darkness. A theory as to how these animals find their way through obstacles to their food is pu...

We have used the Faint Object Spectrograph of the Hubble Space Telescope to record the ultraviolet emissions of solar-type [(B-V)0 ~ 0.6 mag] dwarf stars in young galactic clusters: five in the Hyades (t ~ 600 Myr); three in the Pleiades (t ~ 70 Myr); and two in α Persei (t ~ 50 Myr). Despite high levels of scattered light in the G130H (1140-1606 Å...

Pointed observations with XMM-Newton provide the basis for creating catalogues of X-ray sources detected serendipitously in each field. This paper describes the creation and characteristics of the 2XMM catalogue. The 2XMM catalogue has been compiled from a new processing of the XMM-Newton EPIC camera data. The main features of the processing pipel...

The 2XMM catalog, the world's largest catalog of X-ray sources, was published in August 2007 by the XMM-Newton Survey Science Centre (SSC). All observations using XMM-Newton which had been released to the public domain by May 2007 were processed using the latest data analysis software and calibration. Spectra and time-series are available for the b...

Aims: Pointed observations with XMM-Newton provide the basis for creating catalogues of X-ray sources detected serendipitously in each field. This paper describes the creation and characteristics of the 2XMM catalogue. Methods: The 2XMM catalogue has been compiled from a new processing of the XMM-Newton EPIC camera data. The main features of the pr...

peripheral nerve fibres;cochlear receptor;receptor cells;sensory cells;tectorial membrane

The Swift team reports the detection of a superflare from the dMe flare star EV Lac. The Burst Alert Telescope (BAT) triggered on EV Lac during a pre-planned slew at 2008-04-25T05:13:57 = T0(BAT), and resulted in an automatic trigger slew to the source. The hard X-ray source was already declining in flux as it entered the BAT field of view during t...

We present the XMM-Newton Medium sensitivity Survey (XMS), including a total of 318 X-ray sources found among the serendipitous content of 25 XMM-Newton target fields. The XMS comprises four largely overlapping source samples selected at soft (0.5-2 keV), intermediate (0.5-4.5 keV), hard (2-10 keV) and ultra-hard (4.5-7.5 keV) bands, the first thre...

At 8:52 am on 8 October 2005 a massive earthquake wracked northern Pakistan and Kashmir. Various teams were sent to Islamabad and the disaster region from the UK. We discuss the types of injury patterns seen and recommend that a central register of volunteers should be created to deal with similar situations in the future.

Large scale X-ray background anisotropy measurements may be combined with our peculiar velocity deduced from the microwave background to search for matter perturbations within z ~ 5, Ariel V data show a significant 12 h variation with a pole coincident, within the errors, with the microwave velocity direction. If this variation is wholly extragalac...

Good contrast is seen between normal tissue and regions of tumor in terahertz pulsed imaging of basal cell carcinoma (BCC). To date, the source of contrast at terahertz frequencies is not well understood. In this paper we present results of a spectroscopy study comparing the terahertz properties (absorption coefficient and refractive index) of exci...

Largely thermal considerations have led the James Webb Space Telescope (JWST) Mid Infra Red Instrument (MIRI) European Consortium to specify a CFRP hexapod with rigidised Invar endfittings and brackets to form the Primary Structure of the instrument. Each bracket incorporates a pair of orthogonal flexures to provide kinematic mounting to JWST. The...

The Building Design Partnership (BDP) Engineering is applying modern methods of construction practice and using modern methods of construction and a sustainable approach for its projects from an environmental perspective. BDP Engineering used cement replacements for both E-Innovations and the New Technology buildings and is encouraging maximum perm...

The feasibility of using terahertz pulsed imaging to map margins of exposed breast tumors was investigated by imaging 22 excised human breast tissue specimens with carcinoma excised from 22 women (mean age, 59 years; range, 39-80 years). The study was approved by the local ethics research committee, and informed consent was obtained from all patien...

We report XMM-Newton observations of the young open cluster NGC 2547 which allow us to characterise coronal activity in solar-type stars at an age of 30 Myr. X-ray emission peaks among G-stars at luminosities (0.3-3keV) of Lx~10^{30.5} erg/s and declines to Lx<=10^{29.0} erg/s among M-stars. Coronal spectra show evidence for multi-temperature diffe...

We report XMM-Newton observations of the young open cluster NGC 2547 which allow us to characterise coronal activity in solar-type stars at an age of 30 Myr. X-ray emission peaks among G-stars at luminosities (0.3-3keV) of Lx~10^{30.5} erg/s and declines to Lx<=10^{29.0} erg/s among M-stars. Coronal spectra show evidence for multi-temperature diffe...

Advances in semiconductor materials and NIR ultrafast lasers have made it possible to generate and detect broadband electromagnetic pulses with frequencies ranging from 0.1 to over 3 THz (1 THz = 1012 Hz). We present recent work using these THz pulses to image exposed breast cancer and spectroscopic results that indicate differences in the properti...

Studies of basal cell carcinoma using terahertz pulsed imaging have revealed a significant difference between regions of tumor and healthy tissue. These differences are manifested in the reflected pulse due to what is thought to be changes in refractive index and absorption. We present measurements of the refractive index and absorption coefficient...

Studies in terahertz (THz) imaging have revealed a difference between diseased and healthy tissue in the THz regime. Since water has strong absorptions at THz frequencies, a likely contributing factor to the contrast mechanism is variation in water content. We have previously modelled the propagation of a THz waveform through water and normal skin...

We have developed a portable terahertz pulsed imaging system (TPI) for use in a hospital environment. The system uses photoconduction to generate and detect terahertz with a frequency content from 0.1-4 THz. In this paper, we report on a feasibility study using TPI for imaging tumours of the breast. Several breast samples were imaged and parameters...

Terahertz radiation lies between the infrared and microwave regions of the electromagnetic spectrum and can be used to excite large amplitude vibrational modes of molecules and probe the weak interactions between them. Terahertz pulsed imaging (TPI) is a noninvasive imaging technique that utilises this radiation. To determine whether TPI could diff...

The technology behind optically-driven terahertz (THz) system is now well developed and commercial applications of this new technology are now beginning to emerge. The terahertz frequency range (0.1 to 10 THz) covers far infrared wavelengths. Terahertz light has the advantages that it is non-ionizing and is not highly scattered like visible and nea...

The first XMM-Newton serendipitous source catalogue has been released on 2003 April 7. The XCAT-DB (http://xcatdb.u-strasbg.fr) is one of the sites from which it is available. The database offers powerful tools to perform various kinds of scientific analysis, particularly designed to deal with links between catalogue sources and correlated entries...

We report on the first detection of X-ray emission from a brown dwarf in the Pleiades, the M7-type Roque 14, obtained using the EPIC detectors on XMM–Newton. This is the first X-ray detection of a brown dwarf intermediate in age between ≈12 and ≈320 Myr. The emission appears persistent, although we cannot rule out flare-like behaviour with a decay...

Terahertz (THz) radiation lies between the infrared and microwave regions of the electromagnetic spectrum. Advances in THz technology have opened up many opportunities in this scientifically and technologically important spectroscopic region. The THz frequency range excites large amplitude vibrational modes of molecules as well as probing the weak...

We have used a 40-ks XMM-Newton observation to examine the X-ray emission of 33 proposed M-type members in. the core of the Pleiades. We reach a limiting X-ray luminosity of LX ~ × 1027 erg s-1 in the field centre and detect 17 of 19 members with MIc < 10.5 (where MIc is absolute magnitude in the Cousins I band, which is centered on 790 nm), and 2...