1SXPS: A deep swift X-ray telescope point source catalog with light curves and spectra

P. A. Evans, J. P. Osborne, A. P. Beardmore, K. L. Page, R. Willingale, C. J. Mountford, C. Pagani, D. N. Burrows, J. A. Kennea, M. Perri, G. Tagliaferri, N. Gehrels

Research output: Contribution to journalArticle

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Abstract

We present the 1SXPS (Swift-XRT point source) catalog of 151,524 X-ray point sources detected by the Swift-XRT in 8 yr of operation. The catalog covers 1905 deg2 distributed approximately uniformly on the sky. We analyze the data in two ways. First we consider all observations individually, for which we have a typical sensitivity of 3 × 10-13 erg cm -2 s-1 (0.3-10 keV). Then we co-add all data covering the same location on the sky: these images have a typical sensitivity of 9 × 10-14 erg cm-2 s-1 (0.3-10 keV). Our sky coverage is nearly 2.5 times that of 3XMM-DR4, although the catalog is a factor of 1.5 less sensitive. The median position error is 5.″5 (90% confidence), including systematics. Our source detection method improves on that used in previous X-ray Telescope (XRT) catalogs and we report >68, 000 new X-ray sources. The goals and observing strategy of the Swift satellite allow us to probe source variability on multiple timescales, and we find 30, 000 variable objects in our catalog. For every source we give positions, fluxes, time series (in four energy bands and two hardness ratios), estimates of the spectral properties, spectra and spectral fits for the brightest sources, and variability probabilities in multiple energy bands and timescales.

Original languageEnglish (US)
Article number8
JournalAstrophysical Journal, Supplement Series
Volume210
Issue number1
DOIs
StatePublished - Jan 1 2014

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point sources
light curve
catalogs
point source
telescopes
sky
x rays
erg
energy bands
timescale
position errors
sensitivity
detection method
hardness
energy
confidence
coverings
probe
time series
probes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Evans, P. A., Osborne, J. P., Beardmore, A. P., Page, K. L., Willingale, R., Mountford, C. J., ... Gehrels, N. (2014). 1SXPS: A deep swift X-ray telescope point source catalog with light curves and spectra. Astrophysical Journal, Supplement Series, 210(1), [8]. https://doi.org/10.1088/0067-0049/210/1/8
Evans, P. A. ; Osborne, J. P. ; Beardmore, A. P. ; Page, K. L. ; Willingale, R. ; Mountford, C. J. ; Pagani, C. ; Burrows, D. N. ; Kennea, J. A. ; Perri, M. ; Tagliaferri, G. ; Gehrels, N. / 1SXPS : A deep swift X-ray telescope point source catalog with light curves and spectra. In: Astrophysical Journal, Supplement Series. 2014 ; Vol. 210, No. 1.
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Evans, PA, Osborne, JP, Beardmore, AP, Page, KL, Willingale, R, Mountford, CJ, Pagani, C, Burrows, DN, Kennea, JA, Perri, M, Tagliaferri, G & Gehrels, N 2014, '1SXPS: A deep swift X-ray telescope point source catalog with light curves and spectra', Astrophysical Journal, Supplement Series, vol. 210, no. 1, 8. https://doi.org/10.1088/0067-0049/210/1/8

1SXPS : A deep swift X-ray telescope point source catalog with light curves and spectra. / Evans, P. A.; Osborne, J. P.; Beardmore, A. P.; Page, K. L.; Willingale, R.; Mountford, C. J.; Pagani, C.; Burrows, D. N.; Kennea, J. A.; Perri, M.; Tagliaferri, G.; Gehrels, N.

In: Astrophysical Journal, Supplement Series, Vol. 210, No. 1, 8, 01.01.2014.

Research output: Contribution to journalArticle

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T2 - A deep swift X-ray telescope point source catalog with light curves and spectra

AU - Evans, P. A.

AU - Osborne, J. P.

AU - Beardmore, A. P.

AU - Page, K. L.

AU - Willingale, R.

AU - Mountford, C. J.

AU - Pagani, C.

AU - Burrows, D. N.

AU - Kennea, J. A.

AU - Perri, M.

AU - Tagliaferri, G.

AU - Gehrels, N.

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N2 - We present the 1SXPS (Swift-XRT point source) catalog of 151,524 X-ray point sources detected by the Swift-XRT in 8 yr of operation. The catalog covers 1905 deg2 distributed approximately uniformly on the sky. We analyze the data in two ways. First we consider all observations individually, for which we have a typical sensitivity of 3 × 10-13 erg cm -2 s-1 (0.3-10 keV). Then we co-add all data covering the same location on the sky: these images have a typical sensitivity of 9 × 10-14 erg cm-2 s-1 (0.3-10 keV). Our sky coverage is nearly 2.5 times that of 3XMM-DR4, although the catalog is a factor of 1.5 less sensitive. The median position error is 5.″5 (90% confidence), including systematics. Our source detection method improves on that used in previous X-ray Telescope (XRT) catalogs and we report >68, 000 new X-ray sources. The goals and observing strategy of the Swift satellite allow us to probe source variability on multiple timescales, and we find 30, 000 variable objects in our catalog. For every source we give positions, fluxes, time series (in four energy bands and two hardness ratios), estimates of the spectral properties, spectra and spectral fits for the brightest sources, and variability probabilities in multiple energy bands and timescales.

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