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ID 14640
file
creator
Yonetoku, D.
Murakami, T.
Nakamura, T.
Yamazaki, Ryo
Inoue, A.K.
Ioka, K.
subject
early universe
gamma rays
bursts
NDC
Astronomy. Space sciences
abstract
We estimate a gamma-ray burst (GRB) formation rate based on the new relation between the spectral peak energy (Ep) and the peak luminosity. The new relation is derived by combining the data of Ep and the peak luminosities by BeppoSAX and BATSE, and it looks considerably tighter and more reliable than the relations suggested by the previous works. Using the new Ep-luminosity relation, we estimate redshifts of the 689 GRBs without known distances in the BATSE catalog and derive a GRB formation rate as a function of the redshift. For the redshift range of 0 ≤ z ≤ 2, the GRB formation rate increases and is well correlated with the star formation rate, while it keeps constant toward z ∼ 12. We also discuss the luminosity function and the redshift dependence of the intrinsic luminosity.
journal title
Astrophysical Journal
volume
Volume 609
issue
Issue 2
start page
935
end page
951
date of issued
2004-06
publisher
University of Chicago Press
issn
0004-637X
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2004 The American Astronomical Society.
relation url
department
Graduate School of Science