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A New Population of High-Redshift Short-Duration Gamma-Ray Bursts

, , , , , , , , , , , , , , , , , , , , , , , , , and

© 2007. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, ,

0004-637X/664/2/1000

Abstract

The redshift distribution of the short-duration gamma-ray bursts (GRBs) is a crucial, but currently fragmentary, clue to the nature of their progenitors. Here we present optical observations of nine short GRBs obtained with Gemini, Magellan, and the Hubble Space Telescope. We detect the afterglows and host galaxies of two short bursts, and host galaxies for two additional bursts with known optical afterglow positions, and five with X-ray positions (lesssim6'' radius). In eight of the nine cases we find that the most probable host galaxies are faint, R ≈ 23-26.5 mag, and are therefore starkly different from the first few short GRB hosts with R ≈ 17-22 mag and z lesssim 0.5. Indeed, we measure spectroscopic redshifts of z ≈ 0.4-1.1 for the four brightest hosts. A comparison to large field galaxy samples, as well as the hosts of long GRBs and previous short GRBs, indicates that the fainter hosts likely reside at z gsim 1. Our most conservative limit is that at least half of the five hosts without a known redshift reside at z > 0.7 (97% confidence level), suggesting that about img1.gif to img2.gif of all short GRBs originate at higher redshifts than previously determined. This has two important implications: (1) we constrain the acceptable age distributions to a wide lognormal (σ gsim 1) with τ* ~ 4-8 Gyr, or to a power law, P(τ) ∝ τn, with -1 lesssim n lesssim 0; and (2) the inferred isotropic energies, Eγ,iso ~ 1050-1052 ergs, are significantly larger than ~1048-1049 ergs for the low-redshift, short GRBs, indicating a large spread in energy release or jet opening angles. Finally, we reiterate the importance of short GRBs as potential gravitational-wave sources and find a conservative detection rate with the advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) of ~2-6 yr-1.

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