INTEGRAL observations of five sources in the Galactic Center region

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 the 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 $\sim 120$ 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 is an LMXB neutron star binary (presumably an X-ray burster) and two other sources (IGR J17597-2201 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.

arXiv comment8 pages, 7 figures, 2 tables, accepted for publication in A&A

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• Unveiling supergiant fast X-ray transient sources with INTEGRAL
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• INTEGRAL observations of recurrent fast X-ray transient sources
• The 2003 Outburst of the X-ray Transient H 1743-322: Comparisons with the Black Hole Microquasar XTE J1550-564
• INTEGRAL insight into the inner parts of the Galaxy. High mass X-ray binaries
• The INTEGRAL Galactic bulge monitoring program: the first 1.5 years
• INTEGRAL/IBIS 7-year All-Sky Hard X-Ray Survey. Part II: Catalog of Sources
• The optical counterpart to the peculiar X-ray transient XTE J1739-302
• Hard Spectra of X-Ray Pulsars from INTEGRAL Data
• XTE J1739-302 as a Supergiant Fast X-ray Transient
• A search for counterparts to massive X-ray binaries using photometric catalogues
• Identification of the optical counterparts of high-mass X-ray binaries through optical photometry and spectroscopy
• The 1 - 50 keV spectral and timing analysis of IGR J18027-2016: an eclipsing, high mass X-ray binary
• The peculiar 2011 outburst of the black hole candidate IGR J17091-3624, a GRS 1915+105 like source?
• Interplay between heartbeat oscillations and wind outflow in microquasar IGR J17091-3624
• Global characteristics of the first IBIS/ISGRI catalogue sources: unveiling a murky episode of binary star evolution
• The two INTEGRAL X-ray transients IGR J17091--3624 and IGR J17098--3628: a multi-wavelength long term campaign
• 3-200 keV spectral states and variability of the INTEGRAL Black Hole binary IGR J17464-3213
• Chandra observations of five INTEGRAL sources: new X-ray positions for IGR J16393-4643 and IGR J17091-3624
• NuSTAR observations of the supergiant X-ray pulsar IGR J18027-2016: accretion from the stellar wind and possible cyclotron absorption line
• Spectral states of the X-ray binary IGR J17091--3624 observed by INTEGRAL and RXTE
• The Galactic LMXB Population and the Galactic Centre Region
• State transition and flaring activity of IGR J17464-3213/H1743-322 with SPI/INTEGRAL telescope
• X-ray spectral state evolution in IGR J17091-3624 and comparison of its heartbeat oscillation properties with those of GRS 1915+105
• The early phase of a H1743-322 outburst observed by INTEGRAL, RXTE, Swift, and XMM/Newton
• The INTEGRAL source IGR J16328-4726: a High Mass X-ray Binary from the Beppo SAX era
• INTEGRAL long-term monitoring of the Supergiant Fast X-ray Transient XTE J1739-302
• A thin diffuse component of the Galactic Ridge X-ray emission and heating of the interstellar medium contributed by the radiation of Galactic X-ray binaries
• Suzaku observes weak flares from IGR J17391-3021 representing a common low-activity state in this SFXT
• GMRT observations of the field of INTEGRAL X-ray sources- II (newly discovered hard X-ray sources)
• XTE J1901+014 - the First Low-Mass Fast X-ray Transient?
• Sample of optically unidentified X-ray binaries in the Galactic bulge. Constraints on the physical nature from infrared photometric surveys
• Capturing the lowest luminosity state of the Supergiant Fast X-ray Transient XTE J1739-302