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J/ApJ/610/247 M31 supersoft and quasi-soft X-ray sources (Di Stefano+, 2004)
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Beginning of ReadMe :J/ApJ/610/247 M31 supersoft and quasi-soft X-ray sources (Di Stefano+, 2004)
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Supersoft X-ray sources in M31.
I. A Chandra survey and an extension to quasi-soft sources.
Di Stefano R., Kong A.K.H., Greiner J., Primini F.A., Garcia M.R.,
Barmby P., Massey P., Hodge P.W., Williams B.F., Murray S.S., Curry S.,
Russo T.A.
<Astrophys. J., 610, 247-260 (2004)>
=2004ApJ...610..247D (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, nearby ; X-ray sources
Keywords: galaxies: individual (M31) - X-rays: binaries - X-rays: galaxies
Abstract:
We report on very soft X-ray sources (VSSs) in M31. In a survey that
was most sensitive to soft sources in four 8'x8' regions covered by
Chandra's ACIS-S S3 CCD, we find 33 VSSs that appear to belong to M31.
Fifteen VSSs have spectral characteristics mirroring the supersoft
X-ray sources studied in the Magellanic Clouds and Milky Way
(kT_eff_<=100eV); we therefore call these "classical" supersoft
sources, or simply supersoft sources (SSSs). Eighteen VSSs may have
either small (<10%) hard components or slightly higher effective
temperatures (but still less than 350eV). We refer to these VSSs as
quasi-soft sources (QSSs).
Description:
The data were taken as part of two separate observing campaigns. One
was a survey studying three distinct regions of the disk. These three
disk fields, which span a wide range of stellar populations, were each
observed three times (15ks for each ACIS-S observation) by Chandra
during 2000-2001, at intervals of 3-4months. The second campaign led
to superb coverage of the central region. The central region of M31
was observed by Chandra ACIS-I eight times from 1999 to 2001, with
exposure times ranging from 4 to 8.8ks. The details of the
observations are given in Kong et al. (2002, Cat. J/ApJ/577/738).
The same region was also observed by Chandra ACIS-S for 37.7ks (after
rejecting high-background periods) on 2001 October 5.