Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50539f&link_type=abstract
Spitzer Proposal ID #50539
Computer Science
Scientific paper
Dense molecular gas, warm dust, and hot ionized gas are different components of the multi-step transformation of cold gas into stars and star clusters. While empirical laws on star formation in galaxies have been established based on global measurements of these components, substantial galaxy-to-galaxy variations still exist and remain unexplained. To understand the mechanisms that induce and regulate star formation and thus galaxy evolution, we need to study processes on the local scales of typical star forming regions and giant molecular clouds. In a set of pilot studies, we analyzed the Spitzer and Galex data of nearby giant spirals M31, M33 and M99, and compared with the new interferometric CO maps of matching angular resolution. We found evidence that variations in local condition, environmental effects, and viewing geometry may explain much of the large scatter in the empirical relationships. Based on the success of this initial investigation, we have collected high- resolution CO images of 63 late-type galaxies from several large surveys, and we are working on obtaining a complete set of Spitzer and Galex data for these galaxies. A companion Spitzer archival research program will re-examine the existing observations along with CO, HI, UV and optical data, focusing on correlations in spatially resolved, individual star-forming regions. Here we propose MIPS imaging of the 11 galaxies in our CO sample that have not already been observed by Spitzer. A GO proposal will request IRAC time for these galaxies, which are a significant addition to our study because they substantially increase the fraction of gas-rich late types in the full sample. Insight from this program will be applicable to not only nearby system, but also high red-shift galaxies for which only integrated quantities are measurable.
Bush Stephanie
Cox Thomas J.
Fazio Giovanni
Keto Eric
Pahre Michael
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