Search Publications
Second ROSAT all-sky survey (2RXS) source catalogue
Haberl, F.; Nandra, K.; Freyberg, M. J. +3 more
Aims: We present the second ROSAT all-sky survey source catalogue, hereafter referred to as the 2RXS catalogue. This is the second publicly released ROSAT catalogue of point-like sources obtained from the ROSAT all-sky survey (RASS) observations performed with the position-sensitive proportional counter (PSPC) between June 1990 and August 199…
The XMM-Newton serendipitous survey. VII. The third XMM-Newton serendipitous source catalogue
Esquej, P.; Motch, C.; Ballet, J. +37 more
Context. Thanks to the large collecting area (3 ×~1500 cm2 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 up to several hundred X-ray sources, most of which are newly discovere…
Discovery of Coherent Pulsations from the Ultraluminous X-Ray Source NGC 7793 P13
Harrison, F. A.; Ptak, A.; Stern, D. +12 more
We report the detection of coherent pulsations from the ultraluminous X-ray source (ULX) NGC 7793 P13. The ≈0.42 s nearly sinusoidal pulsations were initially discovered in broadband X-ray observations using XMM-Newton and NuSTAR taken in 2016. We subsequently also found pulsations in archival XMM-Newton data taken in 2013 and 2014. The significan…
The MUSCLES Treasury Survey. I. Motivation and Overview
Loyd, R. O. Parke; Kowalski, Adam F.; Hawley, Suzanne L. +19 more
Ground- and space-based planet searches employing radial velocity techniques and transit photometry have detected thousands of planet-hosting stars in the Milky Way. With so many planets discovered, the next step toward identifying potentially habitable planets is atmospheric characterization. While the Sun-Earth system provides a good framework f…
Optimal binning of X-ray spectra and response matrix design
Kaastra, J. S.; Bleeker, J. A. M.
Aims: A theoretical framework is developed to estimate the optimal binning of X-ray spectra.
Methods: We derived expressions for the optimal bin size for model spectra as well as for observed data using different levels of sophistication.
Results: It is shown that by taking into account both the number of photons in a given spectral…
The RedMaPPer Galaxy Cluster Catalog From DES Science Verification Data
Benoit-Lévy, A.; Nichol, R. C.; D'Andrea, C. B. +87 more
We describe updates to the redMaPPer algorithm, a photometric red-sequence cluster finder specifically designed for large photometric surveys. The updated algorithm is applied to 150 {{deg}}2 of Science Verification (SV) data from the Dark Energy Survey (DES), and to the Sloan Digital Sky Survey (SDSS) DR8 photometric data set. The DES …
Consistent dust and gas models for protoplanetary disks. I. Disk shape, dust settling, opacities, and PAHs
Waters, L. B. F. M.; Pinte, C.; Ménard, F. +19 more
We propose a set of standard assumptions for the modelling of Class II and III protoplanetary disks, which includes detailed continuum radiative transfer, thermo-chemical modelling of gas and ice, and line radiative transfer from optical to cm wavelengths. The first paper of this series focuses on the assumptions about the shape of the disk, the d…
A systematic search for changing-look quasars in SDSS
Ross, Nicholas P.; Magnier, Eugene; Horne, Keith +10 more
We present a systematic search for changing-look quasars based on repeat photometry from Sloan Digital Sky Survey (SDSS) and Pan-STARRS1, along with repeat spectra from SDSS and SDSS-III Baryon Oscillation Spectroscopic Survey. Objects with large, |Δg| > 1 mag photometric variations in their light curves are selected as candidates to look for c…
The XXL Survey. I. Scientific motivations - XMM-Newton observing plan - Follow-up observations and simulation programme
Smith, G. P.; Chiappetti, L.; Altieri, B. +89 more
Context. The quest for the cosmological parameters that describe our universe continues to motivate the scientific community to undertake very large survey initiatives across the electromagnetic spectrum. Over the past two decades, the Chandra and XMM-Newton observatories have supported numerous studies of X-ray-selected clusters of galaxies, acti…
Resolved atomic lines reveal outflows in two ultraluminous X-ray sources
Fabian, Andrew C.; Middleton, Matthew J.; Pinto, Ciro
Ultraluminous X-ray sources are extragalactic, off-nucleus, point sources in galaxies, and have X-ray luminosities in excess of 3 × 1039 ergs per second. They are thought to be powered by accretion onto a compact object. Possible explanations include accretion onto neutron stars with strong magnetic fields, onto stellar-mass black holes…