Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80135s&link_type=abstract
Spitzer Proposal ID #80135
Physics
Scientific paper
Forty-three square degrees of the nearby Taurus star-forming region were mapped as a Spitzer legacy science program using IRAC and MIPS. While the survey primarily targeted young stellar object point sources, it also detected 37 extended Herbig-Haro object emission nebulosities tracing shock waves in bipolar outflows. Sloan Digital Sky Survey images, specially obtained for part of the survey field, detect many of the same HH objects. Twenty-two sources overall are new discoveries, showing morphologies that range from small knots to large bowshocks. Many of the most interesting new objects have proven to be either undetectable, much fainter, or structurally different in groundbased followup imaging. The best approach to fully characterize these new outflows is thus new, deep imaging with Spitzer itself. We propose IRAC band1 and band2 imaging of the best six of these new outflow systems. The new images will be at least 10x more sensitive than the original survey data, which consisted of only 2x12 sec exposures. They will 1) Define the flow kinematics by measuring proper motions over the >6.5 year time baseline since the original survey data; 2) Provide sufficient signal-to-noise to allow meaningful conclusions on shock strength using the ratio of the band1/band2 images; and 3) Better reveal the overall flow structures by detecting fainter features such as outflow cavity walls, outer bowshock wings, or additional knots along the flow. The results will define the energetics and collimation of these new flows (two of which are giant flows more than two parsecs across) - unique new information on bipolar flows in the mid-IR.
Audard Marc
Knapp Gillian
Noriega-Crespo Alberto
Padgett Deborah
Stapelfeldt Karl
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