2011ApJ...727L..34W

Query : 2011ApJ...727L..34W

2011ApJ...727L..34W - Astrophys. J., 727, L34 (2011/February-1)

An evolving stellar initial mass function and the gamma-ray burst redshift distribution.

WANG F.Y. and DAI Z.G.

Abstract (from CDS):

Recent studies suggest that Swift gamma-ray bursts (GRBs) may not trace an ordinary star formation history (SFH). Here, we show that the GRB rate turns out to be consistent with the SFH with an evolving stellar initial mass function (IMF). We first show that the latest Swift sample of GRBs reveals an increasing evolution in the GRB rate relative to the ordinary star formation rate at high redshifts. We then assume only massive stars with masses greater than the critical value to produce GRBs and use an evolving stellar IMF suggested by Davé to fit the latest GRB redshift distribution. This evolving IMF would increase the relative number of massive stars, which could lead to more GRB explosions at high redshifts. We find that the evolving IMF can well reproduce the observed redshift distribution of Swift GRBs.

Abstract Copyright: ∼

Journal keyword(s): gamma-ray burst: general - stars: luminosity function, mass function

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GRB 090726 gB 16 34 43.50 +72 51 56.5           ~ 70 0

Query : 2011ApJ...727L..34W

Basic data :
GRB 090726 -- Gamma-ray Burst
Other object types: otypes_help 		gB (GRB)
ICRS coord. (ep=J2000) : 		16 34 43.50 +72 51 56.5 [ ] D 2009GCNR..234....1P
FK4 coord. (ep=B1950 eq=1950) : 		16 35 32.35 +72 57 59.1 [ ]
Gal coord. (ep=J2000) : 		105.47442 +35.66483 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 259181 [~] / z(~) 2.71 [~] / cz 812438 [~]
   D 2016ApJ...820...66D
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Identifiers (1) :
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GRB 090726

References (70 between 1850 and 2026) (Total 70)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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