Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8201m&link_type=abstract
HST Proposal ID #8201
Physics
Hst Proposal Id #8201 Galaxy Populations And Interactions
Scientific paper
Ultraluminous Infrared Galaxies {ULIRGs} are the most luminous galaxies known in the local universe, and are predominantly powered by massive star formation. ULIRGs are the only type of star forming galaxies in the local universe with bolometric luminosities approaching those of the Lyman-dropout systems and SCUBA sub-mm detections at z 3. However, very few observations of ULIRGs exist at ultraviolet {UV} wavelengths to compare to these high-z detections. Here we propose imaging a modest size sample of ULIRGs in the UV with STIS. This will extend the observations of these objects into the wavelength range where massive stars dominate the intrinsic spectrum. We will then be better able to compare the rest- frame UV morphology and overall SEDs of ULIRGs to the high-z systems. We will test whether transmitted UV light traces star formation and whether the UV SED reddens with dust absorption as is the case for UV selected starbursts. We will assess what impact ULIRGs make o n rest-frame UV surveys of galaxies. Our images combined with archival optical to near IR images will build on the HST heritage allowing key issues concerning the physics of ULIRGs to be addressed. These include the relative importance of clustered versus diffuse star formation, the mechanism of star formation feedback, and whether and how UV light escapes these dusty systems.
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