Suzaku Observations of Unidentified X-Ray Sources Towards the Galactic Bulge

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Abstract

The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan

We present the Suzaku observations of two unidentified sources discovered with ROSAT towards the Galactic bulge. We obtained the wide-band spectra of these sources above 2 keV, for the first time. The X-ray spectrum of 1RXS J165256.3-264503 showed a Kalpha emission line from He-like Ne and was well reproduced by two thin-thermal plasma components with temperatures of 0.7 and 2.4 keV, which is reminiscent of a spectrum of an active binary. On the other hand, the spectrum of 1RXS J174459.5-172640, extending up to 20 keV, was well represented with a cut-off powerlaw model with a photon index of 2.2 and a cut-off energy of 17 keV, or a multi-color disk blackbody (kT approximately 0.2 keV) plus Comptonized blackbody model, where the electron temperature is 19 keV. Therefore, we inferred that the former is a RS-CVn type binary and the latter is a low-mass X-ray binary (LMXB) with a luminosity of approximately 10(exp 35) erg s(sup -1), at which the X-ray emission mechanism of the LMXB has seldom been studied systematically.

Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science

資料番号: AA0064574103

レポート番号: JAXA-SP-09-008E

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