The Implications of Direct Redshift Measurement of Gamma-Ray Bursts | Zendy

Ehud Cohen | Zendy; Tsvi Piran | Zendy

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The Implications of Direct Redshift Measurement of Gamma-Ray Bursts

Author(s) -

Ehud Cohen,

Tsvi Piran

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310916

Subject(s) - gamma ray burst , astrophysics , redshift , physics , galaxy , luminosity , cosmic cancer database , cosmic distance ladder , redshift survey , astronomy

The recent discoveries of X-ray and optical counterparts for GRBs, and apossible discovery of a host galaxy, implies that a direct measurement of thered-shift of some GRBs host galaxies is eminent. We discuss the implications ofsuch measurements. They could enable us to determine the GRBs luminositydistribution, the variation of the rate of GRBs with cosmic time, and even,under favorable circumstances, to estimate $\Omega$. Using GRB970508 alone, andassuming standard candles, we constrain the intrinsic GRB evolution to$\rho(z)=(1+z)^{-0.5\pm0.7}$.Comment: 12 Latex pages plus one postscript figur

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