Statistics – Computation
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21710801u&link_type=abstract
American Astronomical Society, AAS Meeting #217, #108.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Statistics
Computation
Scientific paper
With the intent of furthering our understanding of the dust properties of the universe as a function of redshift, we investigate the utility of using GRBs as probes of dust composition. Using the measured optical properties of graphite and silicate particles, we can reproduce the extinction observed in GRB spectral energy distributions (SEDs). The photometric SEDs of 78 GRBs with redshifts in the range 0 < z < 5 are fit according to this method, allowing us to measure the graphite and silicate column densities along the line of sight to the GRB, the visual extinction in the host frame, and, in cases where the hydrogen column density for that GRB has also been measured, the dust-to-gas ratio of the host galaxy. In addition, we present computational models of dust evolution in galaxies as a function of redshift. We compare the results of our observations to the predicted trends in the model and discuss the use of GRBs as probes of dust evolution and star formation.
Hartmann Dieter H.
Kann David Alexander
Updike Adria C.
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