TY - JOUR
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
Y1 - 2009/4/25
N2 - 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.
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.
KW - ISM: clouds
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U2 - 10.1093/pasj/61.2.283
DO - 10.1093/pasj/61.2.283
M3 - Article
AN - SCOPUS:67650701743
VL - 61
SP - 283
EP - 290
JO - Publication of the Astronomical Society of Japan
JF - Publication of the Astronomical Society of Japan
SN - 0004-6264
IS - 2
ER -