TY - JOUR
T1 - The mystery of the missing GRB redshifts
AU - Coward, David M.
AU - Howell, Eric
AU - Branchesi, Marica
AU - Guetta, Dafne
AU - Kanaan, Chadia
N1 - Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
PY - 2012
Y1 - 2012
N2 - It is clear that optical selection effects have distorted the “true" GRB redshift distribution to its presently observed biased distribution. We a statistically optimal model that implies GRB host galaxy dust extinction could account for up to 40% of missing optical afterglows and redshifts in z = 0 − 3, but the bias is negligible at very high-z. The limiting sensitivity of the telescopes, and the time to acquire spectroscopic/photometric redshifts, are significant sources of bias for the very high-z sample. We caution on constraining star formation rate and luminosity evolution using the GRB redshift distribution without accounting for these selection effects.
AB - It is clear that optical selection effects have distorted the “true" GRB redshift distribution to its presently observed biased distribution. We a statistically optimal model that implies GRB host galaxy dust extinction could account for up to 40% of missing optical afterglows and redshifts in z = 0 − 3, but the bias is negligible at very high-z. The limiting sensitivity of the telescopes, and the time to acquire spectroscopic/photometric redshifts, are significant sources of bias for the very high-z sample. We caution on constraining star formation rate and luminosity evolution using the GRB redshift distribution without accounting for these selection effects.
UR - http://www.scopus.com/inward/record.url?scp=85052389039&partnerID=8YFLogxK
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AN - SCOPUS:85052389039
SN - 1824-8039
VL - 2012-May
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 2012 Gamma-Ray Bursts Conference, GRB 2012
Y2 - 7 May 2012 through 11 May 2012
ER -