Computer Science
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12258g&link_type=abstract
HST Proposal ID #12258. Cycle 18
Computer Science
Scientific paper
Observations of nearby and distant galaxies {galaxy SEDS, lensed galaxies, and gamma ray bursts} have shown that dust with a wide variation in ultraviolet {UV} extinction properties {e.g., weak and strong 2175 Angstrom bumps} is the norm and not the exception. The Small Magllanic Cloud {SMC} is known to have dust spanning the full range of UV dust properties and is relatively nearby, making it the best galaxy to study the effects of environment {nearby star formation, gas-to-dust ratio, etc.} on the dust extinction. The SMC has sightlines with the traditional SMC extinction curve {no 2175 Angstrom bump, high far-UV rise} and one sightline with a much more Galactic extinction curve {2175 Angstrom bump, weaker far-UV rise}. Unfortunately, there are only five existing SMC extinction curves making any correlation between extinction behavior and environment necessarily very tentative. We are proposing to determine the ultraviolet extinction curves toward 11 additional stars in the SMC thereby tripling the number of SMC extinction curves measured. The 11 reddened and 4 comparison stars for this proposal were picked from samples of hot stars with high quality spectral types and normal U through IRAC 8 micron SEDs {e.g., no Be stars}. The new sightlines have different levels of star formation activity and infrared dust properties. In addition to helping understand the origin of the UV dust extinction variations in galaxies, the study of the spatial variation of UV extinction in the SMC also holds the promise of helping to understand the origin of the 2175 Angstrom bump.;
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