X-ray source population of the Galactic center region obtained with ASCA
Masaaki Sakano(1), Katsuji Koyama(2), Hiroshi Murakami(2), Yoshitomo Maeda(3), Shigeo Yamauchi(4), The ASCA Galactic plane/center survey team
(1) NASDA/SURP, Tsukuba, Ibaraki 305-8505, Japan, firstname.lastname@example.org
(2) Kyoto Univ., Sakyo, Kyoto, 606-8502, Japan
(3) Pennsylvania State Univ., University Park, PA 16802-6305, USA
(4) Iwate Univ., Morioka, Iwate, 020-8550, Japan
Paper: proc of "New Century of X-ray Astronomy", 6-8 March 2001, Yokohama, Japan
From the ASCA X-ray point-source list in the Galactic center
5* 5 degree2 region,
we found the clear correlation between the position of the sources
and the absorption. This fact implies that
the major part of the absorption is due to the cold interstellar matter (ISM)
in the line of sight. Using the correlation, we estimate the distribution
of the cold ISM.
We also found that the ratio of high mass binaries to low mass binaries is
significantly smaller than that in the whole Galaxy or SMC, which implies
that the past starburst activity in the Galactic center region was rather quiet.
Preprints available from the authors at email@example.com
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