X-Ray Heating of Dust in Gamma-Ray Burst Environments

Details X-Ray Heating of Dust in Gamma-Ray Burst Environments X-Ray Heating of Dust in Gamma-Ray Burst Environments

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jsara...4...26h&link_type=abstract

Journal of the Southeastern Association for Research in Astronomy, vol. 4, p. 26-30

Astronomy and Astrophysics

Astronomy

Gamma Rays: Bursts, Dust, Extinction, X-Rays

Scientific paper

We report observations in the R-band of the afterglow of GRB 090618 with the SARA 0.9m telescope at Kitt Peak National Observatory. The lightcurve can be fit with a broken power law, with a possible jet break at tj ∼ 0.74 days. The foreground extinction to this burst is AR = 0.036 while the extinction in the host galaxy is undetermined. We also carry out a study of dust destruction by X-ray heating due to the early emission from gamma-ray bursts. We find that dust can be destroyed to distances of a few parsecs, so that the local environment of a GRB may not contribute significantly to the possible obscuration. These results are consistent with earlier results based on dust sublimation from optical/UV flashes. While multiband photometry of GRB afterglows offers a powerful probe of dust evolution to large redshifts, the effects of the intense X-ray emission on dust in the vicinity of the burst must be taken into account.

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