Physics and Astronomy Colloquium Series
Thursday, March 13, 2014
Dr. Jason Ybarra
Instituto de Astronomía, UNAM
Abstract: The data from the Spitzer Space Telescope Infrared Array Camera (IRAC) has provided invaluable insights in star formation. In addition to the identification and classification of young forming stars, IRAC photometry can be used to analyze extended emission seen in star forming regions. The location of shocked molecular hydrogen (H2) emission in IRAC photometric color space can be used to search for protostellar outflows and to probe the thermal conditions of the shocked gas in the flow. In this study we model the emission from UV excited fluorescent H2 and PAH grains in photo-dissociation regions (PDRs) and calculate the resulting color space. We show that the density of a PDR is reflected in the color space along with the strength of the radiation field. Additionally, we find that color analysis can be used to distinguish between shocked and UV excited H2 emission.
The Physics and Astronomy Colloquium Series is open to all members of the university. Unless otherwise noted, talks are held on Thursday afternoons at 4:00-5:20 in Mendocino 1015. Schedule is regularly updated as dates, titles, and abstracts are received. Please check back often. To receive updates about the Colloquium Series, please join our Events Mailing List. For past semesters' series, see our archive.
Spring 2014 Semester Schedule
Note: There are several talks this semester scheduled on Tuesdays at 4PM.
Please check back frequently for updates to our schedule
February 11 (Tuesday)