Astronomy and Astrophysics – Astronomy
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30680h&link_type=abstract
Spitzer Proposal ID #30680
Astronomy and Astrophysics
Astronomy
Scientific paper
Understanding galaxy formation is at the foundation of extragalactic astronomy. Galaxies are thought to be assembled via mergers of small dwarf-like systems at high redshift. One of the best ways of providing observational constraints to the models is through a better understanding of local examples of these "building blocks", star forming dwarf galaxies. We have exploited the SWIRE legacy database to perform an unbiased search for extreme star forming PAH-rich dwarf galaxies. We wish to observe a complete and flux-limited 8 um selected sample of 27 PAH-rich dwarf galaxies in the ELAIS N1 field with the Infrared Spectrograph. This proposal is part of a much larger study of the PAH-rich dwarf galaxy population. However, the Spitzer observations are critical for our project as this is a mid-infrared selected sample and we need to compare the mid-infrared properties with Spitzer surveys of known galaxy type. Only Spitzer enables us to measure the PAH features; directly observe the low-J rotational molecular hydrogen lines; and the fine structure lines in a practically extinction-free wavelength range. These observations will characterize the physical properties of the star-forming regions, e.g., star formation rate, excitation, electron density, warm molecular gas mass. Please note that this is a COMPLETE SURVEY OF 27 PAH-RICH DWARVES. The SPITZER TIME request is SPLIT between this GTO proposal (SJH_PDGT), which has my total GTO time allocation of 6.6 hrs for 4 sources AND a GO proposal (SJH_PDGO) to observe the remaining 23 SOURCES in 37.9 hrs.
Farrah Duncan
Higdon James J.
Higdon Sarah
Houck James R.
Lonsdale Carol
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