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2SXPS: An improved and expanded Swift X-ray telescope point source catalog

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posted on 27.08.2020, 10:48 by PA Evans, KL Page, JP Osborne, AP Beardmore, R Willingale, DN Burrows, JA Kennea, M Perri, M Capalbi, G Tagliaferri, SB Cenko
We present the 2SXPS (Swift-XRT Point Source) catalog, containing 206,335 point sources detected by the Swift X-ray Telescope (XRT) in the 0.3--10 keV energy range. This catalog represents a significant improvement over 1SXPS, with double the sky coverage (now 3,790 deg$^2$), and several significant developments in source detection and classification. In particular, we present for the first time techniques to model the effect of stray light -- significantly reducing the number of spurious sources detected. These techniques will be very important for future, large effective area X-ray mission such as the forthcoming Athena X-ray observatory. We also present a new model of the XRT point spread function, and a method for correctly localising and characterising piled up sources. We provide light curves -- in four energy bands, two hardness ratios and two binning timescales -- for every source, and from these deduce that over 80,000 of the sources in 2SXPS are variable in at least one band or hardness ratio. The catalog data can be queried or downloaded via a bespoke web interface at https://www.swift.ac.uk/2SXPS, via HEASARC, or in Vizier (IX/58).

History

Citation

P. A. Evans et al 2020 ApJS 247 54

Author affiliation

Department of Physics and Astronomy

Version

AM (Accepted Manuscript)

Published in

The Astrophysical Journal Supplement Series

Volume

247

Issue

54

Publisher

American Astronomical Society

issn

0067-0049

eissn

1538-4365

Acceptance date

05/03/2020

Copyright date

2020

Available date

01/04/2021

Language

English

Publisher version

https://iopscience.iop.org/article/10.3847/1538-4365/ab7db9