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Gamma-ray Burst host galaxy gas and dust

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journal contribution
posted on 16.01.2017, 16:37 by Rhaana Starling, R. Wijers, K. Wiersema
We report on the results of a study to obtain limits on the absorbing columns to wards an initial sample of 10 long Gamma-Ray Bursts observed with BeppoSAX, using a new approach to SED fitting to nIR, optical and X-ray afterglow data, in count space and including the effects of metallicity. When testing MW, LMC and SMC extinction laws we find that SMC-like extinction provides the best fit in most cases. A MW-like ext inction curve is not preferred for any of these sources, largely since the 2175A bump, in principle detectable in all these afterglows, is not present in the data. We rule out an SMC-like gas-to-dust ratio or lower value for 4 of the hosts analysed here (assuming SMC metallicity and extinction law) whilst the remainder of the sample have too large an error to discriminate. We provide an accurate estimate of the line-of-sight extinction, improving upon the uncertainties for the majority of the extinction measurements made in previous studies of this sample.

Funding

The authors acknowledge funding from the EU RTN ‘Gamma-Ray Bursts: An Enigma and a Tool’, support from PPARC, and RS thanks the conference organisers for financial assistance.

History

Citation

The Eleventh Marcel Grossmann Meeting: pp. 2009-2011.

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Source

MG11 Meeting on General Relativity. Berlin, Germany

Version

AM (Accepted Manuscript)

Published in

The Eleventh Marcel Grossmann Meeting: pp. 2009-2011.

Publisher

World Scientific

isbn

9789812834300

Available date

16/01/2017

Publisher version

http://www.worldscientific.com/doi/abs/10.1142/9789812834300_0310

Temporal coverage: start date

23/07/2006

Language

en

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