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J/A+A/469/27 XMM serendipitous survey AXIS X-ray source counts (Carrera+, 2007)
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Beginning of ReadMe :J/A+A/469/27 XMM serendipitous survey AXIS X-ray source counts (Carrera+, 2007)
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The XMM-Newton serendipitous survey.
III. The AXIS X-ray source counts and angular clustering.
Carrera F.J., Ebrer J., Mateos S., Ceballos M.T., Corral A., Barcons X.,
Page M.J., Rosen S.R., Watson M.G., Tedds J.A., Della Ceca R., Maccacaro T.,
Brunner H., Freyberg M., Lamer G., Bauer F.E., Ueda Y.
<Astron. Astrophys. 469, 27 (2007)>
=2007A&A...469...27C (SIMBAD/NED BibCode)
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ADC_Keywords: Surveys ; X-ray sources
Keywords: surveys - X-rays: general -
cosmology: large-scale structure of the Universe
Abstract:
Recent results have revised upwards the total X-ray background (XRB)
intensity below 10keV, therefore an accurate determination of the
source counts is needed. There are also contradictory results on the
clustering of X-ray selected sources.
We have studied the X-ray source counts in four energy bands: soft
(0.5-2keV), hard (2-10keV), XID (0.5-4.5keV) and ultra-hard
(4.5-7.5keV) in order to evaluate the contribution of sources at
different fluxes to the X-ray background. We have also studied the
angular clustering of X-ray sources in those bands.
AXIS (An XMM International Survey) is a survey of 36 high Galactic
latitude XMM observations covering 4.8deg^2^ in the Northern sky and
containing 1433 serendipitous X-ray sources detected with 5-sigma
significance. This survey has similar depth to the XMM catalogues and
therefore serves as a pathfinder to explore their possibilities. We
have combined this survey with shallower and deeper surveys, and
fitted the source counts with a Maximum Likelihood technique. Using
only AXIS sources we have studied the angular correlation using a
novel robust technique.
Our source counts results are compatible with most previous samples in
the soft, XID, ultra-hard and hard bands. We have improved on previous
results in the hard band. The fractions of the XRB resolved in the
surveys used in this work are 87%, 85%, 60% and 25% in the soft, hard,
XID and ultra-hard bands, respectively. Extrapolation of our source
counts to zero flux is not sufficient to saturate the XRB intensity.
Only galaxies and/or absorbed AGN could contribute the remaining
unresolved XRB intensity. Our results are compatible, within the
errors, with recent revisions of the XRB intensity in the soft and
hard bands. The maximum fractional contribution to the XRB comes from
fluxes within about a decade of the break in the source counts
( 10^-14^cgs), reaching 50% of the total in the soft and hard bands.
Angular clustering (widely distributed over the sky and not confined
to a few deep fields) is detected at 99-99.9% significance in the soft
and XID bands, with no detection in the hard and ultra-hard band
(probably due to the smaller number of sources). We cannot confirm the
detection of significantly stronger clustering in the hard-spectrum
hard sources.
Medium depth surveys such as AXIS are essential to determine the
evolution of the X-ray emission in the Universe below 10keV.
Description:
We include here the basic data for the 36 XMM-Newton fields and the
2560 X-ray sources in that paper:
- XMM-Newton pn count-rates in four bands (band 2 0.5-2keV,
band 3 2-4.5keV, band 4 4.5-7.5keV, band 5 7.5-12keV)
- spectral photon indices in the 0.5-4.5keV band, in the 2-10keV
band and in the 0.5-10keV band
- fluxes in the soft (0.5-2keV), hard (2-10keV), XID (0.5-4.5keV),
ultra-hard (4.5-7.5keV) and "total" (0.5-10keV) bands
- flags to describe to which of the samples discussed in that paper
(soft, hard, XID or ultra-hard) each source belongs to
There is no spectral or flux information on the sources not belonging
to any of the samples, the count-rates are given for completeness