X-ray source population of the Galactic center region obtained with ASCA

Details X-ray source population of the Galactic center region obtained with ASCA X-ray source population of the Galactic center region obtained with ASCA

2001-07-23

arxiv.org/abs/astro-ph/0107444v1

Astronomy and Astrophysics

Astrophysics

submitted to Proceeding of "New Century of X-ray Astronomy", 6-8 March 2001, Yokohama, Japan (2 pages, 1 Fig, requires pasp.st

Scientific paper

From the ASCA X-ray point-source list in the Galactic center 5x5 degree^2 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.

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