Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-07-21
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
19 pages, 15 figures, accepted for PASJ Vol.63 No.6
Scientific paper
We surveyed the (1,1), (2,2), and (3,3) lines of NH3 and the H2O maser toward the molecular cloud L935 in the extended HII region NGC 7000 with an angular resolution of 1.6' using the Kashima 34-m telescope. We found five clumps in the NH3 emission with a size of 0.2--1 pc and mass of 9--452 M_sun. The molecular gas in these clumps has a similar gas kinetic temperature of 11--15 K and a line width of 1--2 km/s. However, they have different star formation activities such as the concentration of T-Tauri type stars and the association of H2O maser sources. We found that these star formation activities are related to the geometry of the HII region. The clump associated with the T-Tauri type star cluster has a high star formation efficiency of 36--62%. This clump is located near the boundary of the HII region and molecular cloud. Therefore, we suggest that the star formation efficiency increases because of the triggered star formation.
Handa Toshihiro
Kobayashi Hideyuki
Koyama Yasuhiro
Nagayama Takumi
Omodaka Toshihiro
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