TY - JOUR
T1 - Star Formation Rates and Stellar Masses in z ~ 1 Gamma-Ray Burst Hosts
AU - Castro Cerón, J. M.
AU - Michalowski, Michal
AU - Hjorth, J.
AU - Watson, D.
AU - Fynbo, J. P. U.
AU - Gorosabel, J.
PY - 2006/12/1
Y1 - 2006/12/1
N2 - We analyze 4.5, 8, and 24 μm band Spitzer images of six gamma-ray
burst host galaxies at redshifts close to 1. We constrain their star
formation rates (SFRs) based on the entire available spectral energy
distribution rather than the 24 μm band only. Further, we estimate
their stellar masses (M*) based on rest-frame K-band
luminosities. Our sample spans a wide range of galaxy properties:
derived SFRs range from less than 10 to a few hundred solar masses per
year; values of M* range from 109 to
1010 Msolar with a median of
5.6×109 Msolar. Comparing the specific star
formation rate (φ≡SFR/M*) of our sample as a
function of M* to other representative types of galaxies
(distant red galaxies, Lyα emitters, Lyman break galaxies,
submillimeter galaxies, and z~2 galaxies from the Great Observatories
Origins Deep Survey-North field), we find that gamma-ray burst hosts are
among those with the highest φ.
This work is based in part on observations made with the Spitzer Space
Telescope, which is operated by the Jet Propulsion Laboratory,
California Institute of Technology, under a contract with NASA.
AB - We analyze 4.5, 8, and 24 μm band Spitzer images of six gamma-ray
burst host galaxies at redshifts close to 1. We constrain their star
formation rates (SFRs) based on the entire available spectral energy
distribution rather than the 24 μm band only. Further, we estimate
their stellar masses (M*) based on rest-frame K-band
luminosities. Our sample spans a wide range of galaxy properties:
derived SFRs range from less than 10 to a few hundred solar masses per
year; values of M* range from 109 to
1010 Msolar with a median of
5.6×109 Msolar. Comparing the specific star
formation rate (φ≡SFR/M*) of our sample as a
function of M* to other representative types of galaxies
(distant red galaxies, Lyα emitters, Lyman break galaxies,
submillimeter galaxies, and z~2 galaxies from the Great Observatories
Origins Deep Survey-North field), we find that gamma-ray burst hosts are
among those with the highest φ.
This work is based in part on observations made with the Spitzer Space
Telescope, which is operated by the Jet Propulsion Laboratory,
California Institute of Technology, under a contract with NASA.
U2 - 10.1086/510618
DO - 10.1086/510618
M3 - Article
SN - 1538-4357
VL - 653
JO - Astrophysical Journal
JF - Astrophysical Journal
ER -