Modest Obscured Star-Formation Rates Inferred from EVLA Observations of Dark GRB Host Galaxies

Astronomy and Astrophysics – Astronomy

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If a significant fraction of cosmic star formation occurs in submillimeter- and radio-luminous galaxies, and if gamma-ray bursts serve as an unbiased tracer of star formation, many GRBs should be hosted within these systems - but few radio host detections have been reported to date. We present host observations with the full-bandwidth EVLA of a sample of highly dust-obscured ("dark") GRBs previously found to have occurred within significantly dust-obscured galaxies. All systems are quite faint at radio wavelengths, and most are undetected even at the level of the EVLA's sensitivity (RMS 5 microJy). The implied radio-derived star-formation rates are modest, usually comparable to what is inferred from the dust-corrected optical observations. These results suggest that most dark GRBs occur within dusty regions of relatively ordinary galaxies, and indicate that the most extreme systems rarely produce GRBs.

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