A Chain of Dark Clouds in Projection Against the Galactic Center

Details A Chain of Dark Clouds in Projection Against the Galactic Center A Chain of Dark Clouds in Projection Against the Galactic Center

2008-12-04

arxiv.org/abs/0812.0865v1

Astronomy and Astrophysics

Astrophysics

13 pages, 7 figures, accepted for publication in PASJ

Scientific paper

In the J, H, and Ks bands survey of the the Galactic Center region over an area of 2deg x 5deg, we have found many dark clouds, among which a distinguished chain of dark clouds can be identified with a quiescent CO cloud. The distances of the clouds is estimated to be 3.2-4.2 kpc, corresponding to the Norma arm by our new method to determine distance to dark clouds using the cumulative number of stars against J-Ks colors. Adopting these estimated distances, the size is about 70 pc in length and the total mass of the cloud is 6x10^4 M_solar. Three compact HII regions harbor in the cloud, indicating that star forming activities are going on at the cores of the quiescent CO cloud on the spiral arm.

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