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JEM-X/INTEGRAL X-ray survey of the galactic center region

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Abstract

An X-ray survey of the Galactic center region with a radius of ~20◦ has been performed using the data obtained with the JEM-X telescope onboard the INTEGRAL observatory over ~10 years of observations (2003–2013). The exposure at the field center directly toward the Galactic center has reached 4.8 Ms. We have constructed sky maps in the 5–10 and 10–25 keV energy bands and compiled a catalog of detected sources. Together with 83 sources revealed on the integral sky maps, it includes 22 transients that are absent on them but are confidently detected during outbursts with a duration of several days. One of the persistent sources, IGR J17452-2909, has never been observed previously. In contrast to the catalog of sources detected in the harder energy band by the IBIS/ISGRI telescope onboard the INTEGRAL observatory, most of the sources in this catalog are low-mass X-ray binaries (73 of the 105 sources) and only 18 + 3 are high-mass X-ray binaries and cataclysmic variables. Out of the Galactic sources, there are also the black hole candidate XTE J1652-453, the peculiar X-ray burster XMMJ174457-2850.3, and the soft gamma repeater SGR 1806–20 in the catalog; out of the extragalactic sources, there are three active galactic nuclei and a galaxy cluster (Oph CL). The nature of four sources, including the newly discovered one, still remains unknown. We have constructed the luminosity function for the low-mass X-ray binaries from the catalog and considered other statistical properties of their sample.

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  1. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117997, Russia

    S. A. Grebenev & I. A. Mereminskiy

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Original Russian Text © S.A. Grebenev, I.A. Mereminskiy, 2015, published in Pis’ma v Astronomicheskiǐ Zhurnal, 2015, Vol. 41, No. 12, pp. 826–846.

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Grebenev, S.A., Mereminskiy, I.A. JEM-X/INTEGRAL X-ray survey of the galactic center region. Astron. Lett. 41, 765–784 (2015). https://doi.org/10.1134/S1063773715120038

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