2009ApJS..181..110M


Query : 2009ApJS..181..110M

2009ApJS..181..110M - Astrophys. J., Suppl. Ser., 181, 110-128 (2009/March-0)

A catalog of X-ray point sources from two megaseconds of Chandra observations of the Galactic center.

MUNO M.P., BAUER F.E., BAGANOFF F.K., BANDYOPADHYAY R.M., BOWER G.C., BRANDT W.N., BROOS P.S., COTERA A., EIKENBERRY S.S., GARMIRE G.P., HYMAN S.D., KASSIM N.E., LANG C.C., LAZIO T.J.W., LAW C., MAUERHAN J.C., MORRIS M.R., NAGATA T., NISHIYAMA S., PARK S., RAMIREZ S.V., STOLOVY S.R., WIJNANDS R., WANG Q.D., WANG Z. and YUSEF-ZADEH F.

Abstract (from CDS):

We present a catalog of 9017 X-ray sources identified in Chandra observations of a 2°x 0°.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 4x1032 erg/s (0.5-8.0 keV; 90% confidence) over an area of 1 deg2, and up to an order of magnitude more sensitive in the deepest exposure (1.0 Ms) 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 2.8σ 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.

Abstract Copyright:

Journal keyword(s): Galaxy: center - X-rays: stars

VizieR on-line data: <Available at CDS (J/ApJS/181/110): table1.dat table2.dat table3.dat table4.dat table5.dat>

Nomenclature: Table 1: GCS NN (Nos 16-30) added. Table 2, col(2): CXOGC JHHMMSS.s+DDMMSS N=9017.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

CDS comments: Table 2, col(1): numbering NNNN not used in SIMBAD.

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Great Annihilator LXB 17 43 54.83 -29 44 42.6           ~ 647 1
2 AX J1744.3-2940 X 17 44 17.6 -29 39 48           ~ 4 0
3 NAME Sgr C MoC 17 44 36.3 -29 28 13           ~ 325 0
4 KS 1741-293 LXB 17 44 51.63 -29 20 42.8           ~ 93 0
5 CXOGC J174457.1-285740 X 17 44 57.1 -28 57 40           ~ 2 0
6 CXOGC J174457.4-285622 X 17 44 57.4 -28 56 22           ~ 2 0
7 CXOGC J174459.9-290538 X 17 44 59.9 -29 05 38           ~ 2 0
8 CXOGC J174459.9-290324 X 17 44 59.9 -29 03 24           ~ 2 0
9 CXOGC J174500.2-290057 X 17 45 00.2 -29 00 57           ~ 2 0
10 CXOGC J174501.9-285719 X 17 45 01.9 -28 57 19           ~ 2 0
11 CXOGC J174502.2-285749 X 17 45 02.2 -28 57 49           ~ 2 0
12 2XMM J174502.1-285450 LXB 17 45 02.33 -28 54 49.7           ~ 119 0
13 CXOGC J174502.4-290453 X 17 45 02.4 -29 04 53           ~ 2 0
14 CXOGC J174502.4-290205 X 17 45 02.4 -29 02 05           ~ 2 0
15 CXOGC J174502.8-290429 X 17 45 02.8 -29 04 29           ~ 2 0
16 CXOGC J174504.2-290610 X 17 45 04.2 -29 06 10           ~ 2 0
17 CXOGC J174504.2-290410 X 17 45 04.2 -29 04 10           ~ 2 0
18 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 925 0
19 [SKM2002] 27 LXB 17 45 35.65 -29 01 34.0           ~ 164 1
20 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12316 0
21 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3686 3
22 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 666 0
23 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 475 0
24 2E 3944 LXB 17 46 21.09 -28 43 42.3     12.50     ~ 106 0
25 CXO J174622.7-285218 X 17 46 22.73 -28 52 18.3           ~ 9 0
26 NAME Sgr B MoC 17 47 02 -28 25.4           ~ 201 0
27 [KRL2007b] 275 LXB 17 47 02.60 -28 52 58.9     14.20     ~ 160 0
28 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2022 1
29 AX J1748.0-2829 LXB 17 48 05.060 -28 28 25.80     13.60     ~ 175 0
30 NAME Galactic Bulge reg ~ ~           ~ 3633 0

    Equat.    Gal    SGal    Ecl

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2021.07.30-16:33:29

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