The Spitzer Taurus Legacy Program: An Inventory Of Herbig-Haro Flows Over 43 Square Degrees

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The bandpasses of the Spitzer Space Telescope IRAC camera include several H2 rotational emission lines that can be excited in shocked molecular gas. The Spitzer/Taurus Legacy Program represents the largest area imaging survey to date of this star-forming region with sensitivity to Herbig-Haro flows. We have visually examined the IRAC channel 2 mosaics and found 22 compact nebulosities that we identify as Herbig-Haro objects. Six are mid-infrared counterparts to the previously known HH objects 192, 300, 410, 413, 434-436, and 704. The other 16 are previously unknown. Small bowshock pairs are found on opposite sides of DF Tau and DL Tau. A pair of large bowshocks is found 1.2 degrees on either side of the B22 cloud: A giant Herbig-Haro flow spanning almost 6 pc, with an ejection age of 104 years, and with TMR 1 as the most likely outflow source. For six of the new HH objects, no clear outflow source has been identified. We will present the Spitzer images and, if November weather cooperates, wide-field optical CCD images of the new flows from the Palomar 5m telescope.

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