Computer Science
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9896m&link_type=abstract
HST Proposal ID #9896
Computer Science
Hst Proposal Id #9896 Ism And Circumstellar Matter
Scientific paper
The effects of dust are crucial to the study of galaxies {through models of galaxy evolution and star formation rates/histories}, cosmology {e.g., through its effects on SNe Ia fluxes}, and the interpretation of gamma-ray burst afterglows. ?However, classical methods for obtaining precise extinction curves cannot be applied outside the Local Group. Recently, we demonstrated that gravitational lenses can be used to measure extinction curves at intermediate redshifts with high accuracy. We propose a survey of the extinction curves in 6 lens galaxies known to contain dust, to study the evolution of dust properties in galaxies out to z=1. ?We will obtain multi-wavelength photometry {6 filters from 8140 A to 2550 A} of each system to {1} construct non-parametric extinction curves which overlap the 2175 A feature, {2} measure R{V} to a 2-sigma accuracy better than 0.5 for parametric models of Galactic dust, and {3} discriminate between Galactic and SMC extinction curves to better than 2-sigma accuracy. The compact angular size of the lens systems {1-2 arcsec} and the need for near-UV images means that HST is required to make the measurements.
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