ASCA X-ray source catalogue in the Galactic Center region

Masaaki Sakano(1) Katsuji Koyama(2), Hiroshi Murakami(2,5) Yoshitomo Maeda(3,5,6) Shigeo Yamauchi(4)

(1) Space Utilization Research Program (SURP), National Space Develop Agency of Japan (NASDA), 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505 Japan,
(2) Department of Physics, Kyoto University, Kyoto 606-8502 Japan,
(3) Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Lab. University park, PA 16802-6305,
(4) Faculty of Humanities and Social Sciences, Iwate University, 3-18-34 Ueda, Morioka, Iwate 020-8550, Japan,
(5) Research Fellow of the Japan Society for the Promotion of Science.
(6) Subaru Telescope,National Astronomical Observatory of Japan, 650 North Aohoku Place, Hilo, HI 96720

Paper: ApJS, 2001, in press


EPrint Server: astro-ph/0108376


The ASCA satellite made 107 pointing observations on a 5* 5 deg2 region around the center of our Milky Way Galaxy (the Galactic Center) from 1993 to 1999. In the X-ray images of the 0.7-3 keV or 3-10 keV bands, we found 52 point sources and a dozen diffuse sources. All the point sources are uniformly fitted with an absorbed power-law model. For selected bright sources, Sgr A^*, AX J1745.6-2901, A 1742-294, SLX 1744-300, GRO J1744-28, SLX 1737-282, GRS 1734-292, AX J1749.2-2725, KS 1741-293, GRS 1741.9-2853, and an unusual flare source XTE J1739-302, we present further detailed spectral and timing analyses, and discuss on their nature. A dozen extended X-ray sources comprise radio supernova remnants, giant molecular clouds, and those new discoveries. Most show emission lines from either highly ionized atoms or low-ionized irons. The X-ray spectra were fitted with either a thin thermal or power-law model. This paper summarizes the results and provides the ASCA X-ray source catalogue in the Galactic Center region.

Preprints available from the authors at , or the raw TeX (no figures) if you click here.

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