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

doi:10.1093/pasj/61.2.283

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 journal › Article › peer-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 M_G, 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 language	English
Pages (from-to)	283-290
Number of pages	8
Journal	Publications of the Astronomical Society of Japan
Volume	61
Issue number	2
DOIs	https://doi.org/10.1093/pasj/61.2.283
Publication status	Published - 2009 Apr 25
Externally published	Yes

Keywords

ISM: clouds

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/pasj/61.2.283

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A chain of dark clouds in projection against the galactic center. / Nagayama, Takahiro; Sato, Shuji; Nishiyama, Shogo; Murai, Yuka; Nagata, Tetsuya; Hatano, Hirofumi; Kurita, Mikio; Tamura, Motohide; Nakajima, Yasushi; Sugitani, Koji; Oka, Tomoharu; Sofue, Yoshiaki.

In: Publications of the Astronomical Society of Japan, Vol. 61, No. 2, 25.04.2009, p. 283-290.

Research output: Contribution to journal › Article › peer-review

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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.",

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T1 - A chain of dark clouds in projection against the galactic center

AU - Nagayama, Takahiro

AU - Sato, Shuji

AU - Nishiyama, Shogo

AU - Murai, Yuka

AU - Nagata, Tetsuya

AU - Hatano, Hirofumi

AU - Kurita, Mikio

AU - Tamura, Motohide

AU - Nakajima, Yasushi

AU - Sugitani, Koji

AU - Oka, Tomoharu

AU - Sofue, Yoshiaki

PY - 2009/4/25

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AB - 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.

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