Journal
ASTRONOMICAL JOURNAL
Volume 138, Issue 6, Pages 1830-1845Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/138/6/1830
Keywords
infrared: ISM; infrared: stars; ISM: individual (rho Ophiuchi); ISM: jets and outflows; stars: formation
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Funding
- NASA
- NSFC [10733030, 10621303]
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Using the IRAC images from the Spitzer c2d program, we have made a survey of mid-infrared outflows in the rho Ophiuchi molecular cloud. Extended objects that have prominent emission in IRAC channel 2 (4.5 mu m) compared to IRAC channel 1 (3.6 mu m) and stand out as green objects in the three-color images (3.6 mu m in blue, 4.5 mu m in green, 8.0 mu m in red) are identified as mid-infrared outflows. As a result, we detected 13 new outflows in the rho Ophiuchi molecular cloud that have not been previously observed in either the optical or the near-infrared. In addition, at the positions of previously observed HH objects or near-infrared emission, we detected 31 mid-infrared outflows, among which seven correspond to previously observed HH objects and 30 to near-infrared emission. Most of the mid-infrared outflows detected in the rho Ophiuchi cloud are concentrated in the L1688 dense core region. In combination with the survey results for young stellar objects (YSOs) and millimeter and submillimeter sources, the distribution of mid-infrared outflows in the rho Ophiuchi molecular complex hints a propagation of star formation in the cloud in the direction from the northwest to the southeast, as suggested by previous studies of the region.
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