Submitted to ApJ IRAC Observations of CO J = 4 → 3 High-Velocity Cloud in the 30 Doradus Complex in the Large Magellanic Cloud

• Main Authors: Hak-sub Kim, Sungeun Kim, Jih-yong Bak, Mario Garcia, Bernard Br, Kecheng Xiao, Wilfred Walsh, R. Chris Smith, Soyoung Youn
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Antarctic; The Antarctic; Antarc*
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.313.1076; http://arxiv.org/pdf/0704.2821v1.pdf

We present the results of 12 CO J = 2 → 1 observations of the X-ray bright giant shell complex 30 Doradus in the Large Magellanic Cloud (LMC) using the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO). This is the one of the largest HII complexes in the Local Group. We compare the 12 CO J = 2 → 1 observations against previously taken 12 CO J = 4 → 3 observations and analyze the spatial distribution of young stellar objects (YSO’s) within the cloud using the Spitzer IRAC observations of the 30 Doradus complex. Both peaks of 12 CO J = 2 → 1 and J = 4 → 3 emitting clouds coincide with the densest region of the filaments where multiple shells are colliding. We find that the YSO’s are clustered in the southern ridge of the warm and dense molecular gas clouds traced by 12 CO J = 4 → 3, indicating a filamentary structure of star formation throughout the 30 Doradus. We also find that some of Class I YSO’s candidates which are likely to be Associated with a high-velocity component of 12 CO J = 4 → 3 emitting clouds are present. This is a bona fide place where the triggered star formation had happened and newly formed stars may have produced such a high-velocity outflow interacting with the surrounding molecular cloud material.