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

Details Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL

2003-11-06

arxiv.org/abs/astro-ph/0311147v3

Astrophys.J. 601 (2004) L163-L166

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures

Scientific paper

10.1086/381738

This letter presents the first results of an observational campaign to study the Galactic Centre with INTEGRAL. The mosaicked images obtained with the IBIS/ISGRI coded aperture instrument in the energy ranges 20-40 and 40-100 keV, give a yet unseen view of the high-energy sources of this region in hard X- and gamma-rays with an angular resolution of 12 arcmin (FWHM). We report on the discovery of a source, IGR J17456-2901, coincident with the Galactic Nucleus SgrA* to within 0.9 arcmin. Located at R.A.(J2000.0) = 17h45m38.5s, Dec.(J2000.0) = -29:01:15, the source is visible up to about 100 keV with a 20-100 keV luminosity at 8 kpc of (2.89 +/- 0.41) x 10^35 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 arcmin of the Galaxy and a contribution from the galactic supermassive black hole itself cannot be excluded.

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