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A Catalog of X-ray Point Sources from Two Megaseconds of Chandra Observations of the Galactic Center | | M. P. Muno
; F. E. Bauer
; F. K. Baganoff
; R. M. Bandyopadhyay
; G. C. Bower
; W. N. Brandt
; P. S. Broos
; A. Cotera
; S. S. Eikenberry
; G. P. Garmire
; S. D. Hyman
; N. E. Kassim
; C. C. Lang
; T. J. W. Lazio
; C. Law
; J. C. Mauerhan
; M. R. Morris
; T. Nagata
; S. Nishiyama
; S. Park
; S. V. Ramirez
; S. R. Stolovy
; R. Wijnands
; Q. D. Wang
; Z. Wang
; F. Yusef-Zadeh
; | | Date: |
5 Sep 2008 | | Abstract: | We present a catalog of 9017 X-ray sources identified in Chandra observations
of a 2 by 0.8 degree field around the Galactic center. We increase the number
of known X-ray sources in the region by a factor of 2.5. The catalog
incorporates all of the ACIS-I observations as of 2007 August, which total 2.25
Msec of exposure. At the distance to the Galactic center (8 kpc), we are
sensitive to sources with luminosities >4e32 erg/s (0.5-8.0 keV; 90%
confidence) over an area of one square degree, and up to an order of magnitude
more sensitive in the deepest exposure (1.0 Msec) around Sgr A*. The positions
of 60% of our sources are accurate to <1" (95% confidence), and 20% have
positions accurate to <0.5". We search for variable sources, and find that 3%
exhibit flux variations within an observation, 10% exhibit variations from
observation-to-observation. We also find one source, CXOUGC J174622.7-285218,
with a periodic 1745 s signal (1.4% chance probability), which is probably a
magnetically-accreting cataclysmic variable. We compare the spatial
distribution of X-ray sources to a model for the stellar distribution, and find
2.8 sigma evidence for excesses in the numbers of X-ray sources in the region
of recent star formation encompassed by the Arches, Quintuplet, and Galactic
center star clusters. These excess sources are also seen in the luminosity
distribution of the X-ray sources, which is flatter near the Arches and
Quintuplet than elsewhere in the field. These excess point sources, along with
a similar longitudinal asymmetry in the distribution of diffuse iron emission
that has been reported by other authors, probably have their origin in the
young stars that are prominent at l~0.1 degree. | | Source: | arXiv, 0809.1105 | | Services: | Forum | Review | PDF | Favorites | |
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