ASCA X‐Ray Source Catalog in the Galactic Center Region

Abstract

The ASCA satellite made 107 pointing observations on a 5 ] 5 deg2 region around the center of our Galaxy from 1993 to 1999. In the X-ray images of the 0.7È3 keV or 3È10 keV bands, we found 52 point sources and a dozen di use sources. All the point sources are uniformly Ðtted with an absorbed power-law model. For selected bright sources, Sgr A*, AX J1745.6[2901, A1742[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 Ñare source XTE J1739[302, we present further detailed spectral and timing analyses and discuss their nature. The dozen extended X-ray sources comprise radio supernova remnants, giant molecular clouds, and some new discoveries. Most show emission lines from either highly ionized atoms or low-ionized irons. The X-ray spectra were Ðtted with either a thin thermal or power-law model. This paper summarizes the results and provides the ASCA X-ray source catalog in the Galactic center region.