A CATALOG OF X-RAY POINT SOURCES FROM TWO MEGASECONDS OF CHANDRA OBSERVATIONS OF THE GALACTIC CENTER

被引：158

作者：

Muno, M. P. ^{[1
]}

Bauer, F. E. ^{[2
]}

Baganoff, F. K. ^{[3
]}

Bandyopadhyay, R. M. ^{[4
]}

Bower, G. C. ^{[5
,6
]}

Brandt, W. N. ^{[7
]}

Broos, P. S. ^{[7
]}

Cotera, A.

Eikenberry, S. S. ^{[4
]}

Garmire, G. P. ^{[7
]}

Hyman, S. D. ^{[9
]}

Kassim, N. E. ^{[10
]}

Lang, C. C. ^{[11
]}

Lazio, T. J. W. ^{[10
]}

Law, C. ^{[12
]}

Mauerhan, J. C. ^{[8
,13
]}

Morris, M. R. ^{[13
]}

Nagata, T. ^{[14
]}

Nishiyama, S. ^{[15
]}

Park, S. ^{[7
]}

Ramirez, S. V. ^{[16
]}

Stolovy, S. R. ^{[16
]}

Wijnands, R. ^{[12
]}

Wang, Q. D. ^{[17
]}

Wang, Z. ^{[18
]}

Yusef-Zadeh, F. ^{[19
]}

机构：

[1] CALTECH, Space Radiat Lab, Pasadena, CA 91104 USA

[2] Columbia Astrophys Lab, New York, NY 10027 USA

[3] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[4] Univ Florida, Dept Astron, Gainesville, FL 32611 USA

[5] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[6] Univ Calif Berkeley, Radio Astron Lab, Berkeley, CA 94720 USA

[7] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[8] SETI Inst, Mountain View, CA 94043 USA

[9] Sweet Briar Coll, Dept Phys & Engn, Sweet Briar, VA 24595 USA

[10] Naval Res Lab, Remote Sensing Div, Washington, DC 20375 USA

[11] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[12] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands

[13] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[14] Kyoto Univ, Dept Astron, Kyoto 6068502, Japan

[15] Natl Inst Nat Sci, Natl Astron Observ Japan, Tokyo 1818588, Japan

[16] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA

[17] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[18] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[19] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2009年 / 181卷 / 01期

关键词：

Galaxy: center; X-rays: stars; FIELD NORTH SURVEY; STAR-FORMATION; CATACLYSMIC VARIABLES; STELLAR CLUSTERS; LINE DIAGNOSTICS; CENTER REGION; XMM-NEWTON; EMISSION; GALAXY; DISCOVERY;

D O I：

10.1088/0067-0049/181/1/110

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a catalog of 9017 X-ray sources identified in Chandra observations of a 2 degrees x 0 degrees.8 field around the Galactic center. This enlarges 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 Ms of exposure. At the distance to the Galactic center ( 8 kpc), we are sensitive to sources with luminosities of 4 x 10(32) erg s(-1) (0.5-8.0 keV; 90% confidence) over an area of 1 deg(2), and up to an order of magnitude more sensitive in the deepest exposure (1.0Ms) 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, and 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 approximate to 0 ''.1.

引用

页码：110 / 128

页数：19

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[51] Bondi accretion and the problem of the missing isolated neutron stars [J].