A chain of dark clouds in projection against the galactic center

Takahiro Nagayama, Shuji Sato, Shogo Nishiyama, Yuka Murai, Tetsuya Nagata, Hirofumi Hatano, Mikio Kurita, Motohide Tamura, Yasushi Nakajima, Koji Sugitani, Tomoharu Oka, Yoshiaki Sofue

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In a J, H, and Ks band survey of the Galactic center region over an area of 2° x 5°, 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 are estimated to be 3.2-4.2kpc, corresponding to the Norma arm, by our new method for determining the distances to dark clouds using the cumulative number of stars against the J - Ks color. By adopting these estimated distances, the size and total mass of the cloud are estimated to be ̃ 70 pc in length and 6 x 104 MG, respectively. Three compact H II regions exist in the cloud, indicating that star-forming activities are going on at the cores of the quiescent CO cloud on the spiral arm.

Original languageEnglish
Pages (from-to)283-290
Number of pages8
JournalPublications of the Astronomical Society of Japan
Volume61
Issue number2
DOIs
Publication statusPublished - 2009 Apr 25
Externally publishedYes

Keywords

  • ISM: clouds

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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