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Using the IRAC images from the Spitzer c2d program, we have made a survey ofmid-infrared outflows in the rho Ophiuchi molecular cloud. Extended objectsthat have prominent emission in IRAC channel 2 (4.5 micron) compared to IRACchannel 1 (3.6 micron) and stand out as green objects in the three-color images(3.6 micron in blue, 4.5 micron in green, 8.0 micron in red) are identified asmid-infrared outflows. As a result, we detected 13 new outflows in the rhoOphiuchi molecular cloud that have not been previously observed in optical ornear-infrared. In addition, at the positions of previously observed HH objectsor near-infrared emission, we detected 31 mid-infrared outflows, among whichseven correspond to previously observed HH objects and 30 to near-infraredemission. Most of the mid-infrared outflows detected in the rho Ophiuchi cloudare concentrated in the L1688 dense core region. In combination with the surveyresults for Young Stellar Objects (YSOs) and millimeter and sub-millimetersources, the distribution of mid-infrared outflows in the rho Ophiuchimolecular complex hints a propagation of star formation in the cloud in thedirection from the northwest to the southeast as suggested by previous studiesof the region.

Outflows in rho Ophiuchi as Seen with the Spitzer Infrared Array Camera