Castro Cerón 2006 伽玛暴宿主星系的恒星形成率

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astro-ph/0612355 [abs, ps, pdf, other] :

Title: Star formation rates and stellar masses in z ~ 1 gamma ray burst hosts
Authors: J. M. Castro Cerón, M. J. Michałowski, J. Hjorth, D. Watson, J. P. U. Fynbo, J. Gorosabel
Comments: 4 pages by emulateApJ, 1 table and 2 colour figures; published in ApJ Letters
Journal-ref: ApJ Letters, 653: L85-L88, 20 DEC 2006

We analyse 4.5, 8 and 24 um band Spitzer images of six gamma ray burst host galaxies at redshifts close to 1. We constrain their star formation rates (SFR) based on the entire available spectral energy distribution rather than the 24 um 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 10^9 to 10^10 Mo with a median of 5.6 x 10^9 Mo. Comparing the specific star formation rate (PHI = SFR/M*) of our sample as a function of M* to other representative types of galaxies (distant red galaxies, Ly-alpha 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 PHI.