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Missing GRB host galaxies in deep mid-infrared observations: implications on the use of GRBs as star formation tracers

Le Floc'h, Emeric and Charmandaris, Vassilis and Forrest, Bill and Mirabel, Félix and Armus, Lee and Devost, Daniel (2006) Missing GRB host galaxies in deep mid-infrared observations: implications on the use of GRBs as star formation tracers. In: Gamma-ray bursts in the Swift era: sixteenth Maryland Astrophysics Conference, Washington, DC, 29 November-2 December 2005. AIP Conference Proceedings. No.836. American Institute of Physics , Melville, NY, pp. 528-533. ISBN 0-7354-0326-0.

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We report on the first mid-infrared observations of 16 GRB host galaxies performed with the Spitzer Space Telescope, and investigate the presence of evolved stellar populations and dust-enshrouded star-forming activity associated with GRBs. Only a very small fraction of our sample is detected by Spitzer, which is not consistent with recent works suggesting the presence of a GRB host population dominated by massive and strongly-starbursting galaxies (SFR >~ 100M[sun]yr^–1). Should the GRB hosts be representative of star-forming galaxies at high redshift, models of galaxy evolution indicate that >~ 50% of GRB hosts would be easily detected at the depth of our mid-infrared observations. Unless our sample suffers from a strong observational bias which remains to be understood, we infer in this context that the GRBs identified with the current techniques can not be directly used as unbiased probes of the global and integrated star formation history of the Universe.

Item Type:Book Section
Related URLs:
URLURL TypeDescription 10.1063/1.2207949OtherUNSPECIFIED 10.1063/1.2207949OtherUNSPECIFIED
Charmandaris, Vassilis0000-0002-2688-1956
Armus, Lee0000-0003-3498-2973
Additional Information:© 2006 American Institute of Physics. This conference in Washington DC was a really fruitful and pleasant meeting. The first author would like to thank all the people who contributed in making this event such a success.
Group:Infrared Processing and Analysis Center (IPAC)
Subject Keywords:gamma-ray sources (astronomical); infrared sources (astronomical); galaxies; star formation; cosmology
Series Name:AIP Conference Proceedings
Issue or Number:836
Record Number:CaltechAUTHORS:FLOaipcp06
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5313
Deposited By: Archive Administrator
Deposited On:09 Oct 2006
Last Modified:08 Nov 2021 20:24

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