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Title: THE ABSOLUTE RATE OF LGRB FORMATION

Abstract

We estimate the long-duration gamma-ray burst (LGRB) progenitor rate using our recent work on the effects of environmental metallically on LGRB formation in concert with supernovae (SNe) statistics via an approach patterned loosely off the Drake equation. Beginning with the cosmic star formation history, we consider the expected number of broad-line Type Ic events (the SNe type associated with LGRBs) that are in low-metallicity host environments adjusted by the contribution of high-metallicity host environments at a much reduced rate. We then compare this estimate to the observed LGRB rate corrected for instrumental selection effects to provide a combined estimate of the efficiency fraction of these progenitors to produce LGRBs and the fraction of which are beamed in our direction. From this we estimate that an aligned LGRB occurs for approximately every 4000 ± 2000 low-metallically broad-lined SNe Ic. Therefore, if one assumes a semi-nominal beaming factor of 100, then only about one such supernova out of 40 produce an LGRB. Finally, we propose an off-axis LGRB search strategy of targeting only broad-line Type Ic events that occur in low-metallicity hosts for radio observation.

Authors:
;  [1]
  1. Max-Planck Institute for Extraterrestrial Physics, Giessenbachstrasse 1, D-85748 Garching (Germany)
Publication Date:
OSTI Identifier:
22666219
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 823; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; BEAMS; COMPUTERIZED SIMULATION; COSMIC GAMMA BURSTS; EFFICIENCY; GALAXIES; GAMMA RADIATION; METALLICITY; STAR EVOLUTION; SUPERNOVAE; TYPE I SUPERNOVAE

Citation Formats

Graham, J. F., and Schady, P.. THE ABSOLUTE RATE OF LGRB FORMATION. United States: N. p., 2016. Web. doi:10.3847/0004-637X/823/2/154.
Graham, J. F., & Schady, P.. THE ABSOLUTE RATE OF LGRB FORMATION. United States. doi:10.3847/0004-637X/823/2/154.
Graham, J. F., and Schady, P.. Wed . "THE ABSOLUTE RATE OF LGRB FORMATION". United States. doi:10.3847/0004-637X/823/2/154.
@article{osti_22666219,
title = {THE ABSOLUTE RATE OF LGRB FORMATION},
author = {Graham, J. F. and Schady, P.},
abstractNote = {We estimate the long-duration gamma-ray burst (LGRB) progenitor rate using our recent work on the effects of environmental metallically on LGRB formation in concert with supernovae (SNe) statistics via an approach patterned loosely off the Drake equation. Beginning with the cosmic star formation history, we consider the expected number of broad-line Type Ic events (the SNe type associated with LGRBs) that are in low-metallicity host environments adjusted by the contribution of high-metallicity host environments at a much reduced rate. We then compare this estimate to the observed LGRB rate corrected for instrumental selection effects to provide a combined estimate of the efficiency fraction of these progenitors to produce LGRBs and the fraction of which are beamed in our direction. From this we estimate that an aligned LGRB occurs for approximately every 4000 ± 2000 low-metallically broad-lined SNe Ic. Therefore, if one assumes a semi-nominal beaming factor of 100, then only about one such supernova out of 40 produce an LGRB. Finally, we propose an off-axis LGRB search strategy of targeting only broad-line Type Ic events that occur in low-metallicity hosts for radio observation.},
doi = {10.3847/0004-637X/823/2/154},
journal = {Astrophysical Journal},
number = 2,
volume = 823,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 2016},
month = {Wed Jun 01 00:00:00 EDT 2016}
}