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IX/43 1SXPS Swift X-ray telescope point source catalogue (Evans+ 2014)
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Beginning of ReadMe :IX/43 1SXPS Swift X-ray telescope point source catalogue (Evans+ 2014)
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1SXPS: A deep Swift X-ray telescope point source catalogue 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.
<Astrophys. J., Suppl. Ser. 210, 8 (2014)>
=2013yCat.9043....0E
=2014ApJS..210....8E
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ADC_Keywords: X-ray sources ; Surveys
Mission_Name: Swift
Keywords: Catalogs ; Surveys ; X-rays: observations ; Methods: data analysis
Abstract:
We present the 1SXPS (Swift-XRT Point Source) catalogue of 151,524
X-ray point-sources detected by the Swift-XRT in 8 years of operation.
The catalogue covers 1905 square degrees 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 3e-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 9e-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 XRT catalogues 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.
Description:
The 1SXPS catalogue is a point-source catalogue built from all
Swift-XRT Photon Counting mode data of at least 100-s in duration
gathered prior to 2012 October 12 (Swift was launched in 2004
November). It contains positions, fluxes, spectral details,
variability information and a flag indicating the reliability of the
detection for 151,524 objects. Various values (e.g. the count rates)
are given in 4 bands:
Total = 0.3-10 keV
Soft = 0.3-1 keV
Medium = 1-2 keV
Hard = 2-10 keV
The source detection was performed in each of these bands independently,
and the results combined to give this final catalogue.