2004ApJ...601L.163B

Query : 2004ApJ...601L.163B

2004ApJ...601L.163B - Astrophys. J., 601, L163-L166 (2004/February-1)

Detection of hard X-ray emission from the galactic nuclear region with INTEGRAL.

BELANGER G., GOLDWURM A., GOLDONI P., PAUL J., TERRIER R., FALANGA M., UBERTINI P., BAZZANO A., DEL SANTO M., WINKLER C., PARMAR A.N., KUULKERS E., EBISAWA K., ROQUES J.P., LUND N. and MELIA F.

Abstract (from CDS):

This Letter presents the first results of an observational campaign to study the Galactic center with INTEGRAL, the International Gamma-Ray Astrophysics Laboratory. Mosaicked images were constructed using data obtained with ISGRI, the soft gamma-ray instrument of the coded aperture IBIS imager, in the energy ranges 20-40 and 40-100 keV. These give a yet unseen view of the high-energy sources of this region in hard X-rays and gamma rays with an angular resolution of 12' (FWHM). We report on the discovery of a source, IGR J1745.6-2901, coincident with the Galactic nucleus Sgr A* to within 0'.9. Located at R.A.=17h45m38{fs}5 (J2000.0), decl.=-29°01'15'' (J2000.0), the source is visible up to about 100 keV with a 20-100 keV luminosity at 8 kpc of (2.89±0.41)x1035 ergs/s. Although the new INTEGRAL source cannot unequivocally be associated to the Galactic nucleus, this is the first report of significant hard X-ray emission from within the inner 10' of the Galaxy and a contribution from the Galactic supermassive black hole itself cannot be excluded.

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Journal keyword(s): Black Hole Physics - Galaxy: Center - Galaxy: Nucleus - Gamma Rays: Observations - Stars: Neutron - X-Rays: Binaries

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
3 2E 3938 HXB 17 43 54.7 -29 44 44           ~ 693 1
4 KS 1741-293 LXB 17 44 51.63 -29 20 42.8           ~ 106 0
5 2XMM J174502.1-285450 LXB 17 45 02.4 -28 54 41           ~ 139 0
6 CXOU J174535.5-290124 X 17 45 35.58 -29 01 24.1           ~ 20 0
7 AX J1745.6-2901 LXB 17 45 35.6400 -29 01 33.888           ~ 191 1
8 1A 1742-289 X 17 45 37.1832 -29 01 04.656           ~ 93 1
9 [KRL2007b] 270 gam 17 45 38.5 -29 01 15           ~ 27 0
10 NAME Sgr A West HII 17 45 39.4 -29 00 24           ~ 381 0
11 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
12 CXOGC J174540.0-290014 X 17 45 40.0 -29 00 14           ~ 3 0
13 CXOGC J174540.0-290005 X 17 45 40.0 -29 00 05           ~ 24 1
14 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
15 NAME Sgr A East SNR 17 45 41 -29 00.8           ~ 523 2
16 2E 3943 LXB 17 46 05.3 -29 30 52           ~ 217 1
17 Granat 1743-290 X 17 46 21 -29 03.5     13.30     ~ 13 0
18 2E 3944 LXB 17 46 21.1 -28 43 39     12.50     ~ 126 0
19 CO 000.13-00.13 MoC 17 46.4 -28 54           ~ 24 0
20 AX J1747.4-3000 LXB 17 47 26.0 -30 00 02           ~ 119 0
21 1RXS J174725.6-300241 LXB 17 47 26.2 -30 02 45           ~ 69 0

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