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Issue A&A
Volume 430, Number 3, February II 2005
Page(s) 997 - 1003
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20041677



A&A 430, 997-1003 (2005)
DOI: 10.1051/0004-6361:20041677

INTEGRAL observations of five sources in the Galactic Center region

A. Lutovinov1, M. Revnivtsev1, 2, S. Molkov1 and R. Sunyaev1, 2

1  Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117810 Moscow, Russia
    e-mail: lutovinov@hea.iki.rssi.ru
2  Max-Planck-Institute für Astrophysik, Karl-Schwarzschild-Str. 1, 85740 Garching bei München, Germany

(Received 16 July 2004 / Accepted 10 September 2004)

Abstract
A number of new X-ray sources (IGR J17091-3624, IGR/XTE J17391-3021, IGR J17464-3213 (=XTE J17464-3213 = H 1743-322), IGR J17597-2201, SAX/IGR J18027-2017) have been observed with the INTEGRAL observatory during ultra deep exposure of the Galactic Center region in August-September 2003. Most of them were permanently visible by INTEGRAL at energies higher than $\sim $ 20 keV, but IGR/XTE J17391-3021 was observed only during its flaring activity with a flux maximum of ~ 120 mCrab. IGR J17091-3624, IGR J17464-3213 and IGR J17597-2201 were detected up to $\sim $100-150 keV. In this paper we present the analysis of INTEGRAL observations of these sources to determine the nature of these objects. We conclude that all of them have a galactic origin. Two sources are black hole candidates (IGR J17091-3624 and IGR J17464-3213), one (IGR J17597-2201) is an LMXB neutron star binary (presumably an X-ray burster) and two other sources (IGR J17391-3021 and SAX/IGR J18027-2017) are neutron stars in high mass binaries; one of them (SAX/IGR J18027-2017) is an accreting X-ray pulsar.


Key words: Galaxy: center -- stars: binaries: general -- X-rays: binaries

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