Castro Cerón 2010 伽马暴宿主星系的质量和SFR

主要内容:
说宿主星系都是低质量的star forming system，比field galaxy的平均质量都小。SFR，甚至specific star formation rate都比别人低。

为什么呢？
我觉得其它高SFR的星系应该有更多的伽马暴。原因会不会是高SSFR的星系的尘埃比较多，伽马射线出不来呢？

"the dust-uncorrected UV SFR"和做了修正的区别大吗？这里的SFR的范围是10^-2 M _sun yr^-1 < SFR < 10 M _sun yr^-1. 但是看另一篇文章，却是（0.03，300）！见ADS 2011ApJ...735L...8K， 或者：2010AJ....140.1557L

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Title:		On the Distribution of Stellar Masses in Gamma-ray Burst Host Galaxies
Authors:		Castro Cerón, J. M.; Michałowski, M. J.; Hjorth, J.; Malesani, D.; Gorosabel, J.; Watson, D.;Fynbo, J. P. U.; Morales Calderón, M.
Affiliation:		AA(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark;...)
Publication:		The Astrophysical Journal, Volume 721, Issue 2, pp. 1919-1927 (2010). (ApJ Homepage)
Publication Date:		10/2010
Origin:		IOP
ApJ Keywords:		cosmology: observations, dust, extinction, galaxies: fundamental parameters, galaxies: ISM, gamma-ray burst: general, infrared: galaxies
DOI:		10.1088/0004-637X/721/2/1919
Bibliographic Code:		2010ApJ...721.1919C

Abstract

We analyze Spitzer images of 30 long-duration gamma-ray burst (GRB) host galaxies. We estimate their total stellar masses (M_sstarf) based on the rest-frame K-band luminosities (L_{K_{rest}}) and constrain their star formation rates (SFRs; not corrected for dust extinction) based on the rest-frame UV continua. Further, we compute a mean M_⋆ /L_{K_{rest}} = 0.45 M_sun/L _sun. We find that the hosts are low M _sstarf, star-forming systems. The median M _sstarf in our sample (langM _sstarfrang = 10^9.7 M _sun) is lower than that of "field" galaxies (e.g., Gemini Deep Deep Survey). The range spanned by M _sstarf is 10⁷ M_sun < M _sstarf < 10¹¹ M _sun, while the range spanned by the dust-uncorrected UV SFR is 10^-2 M _sun yr^-1 < SFR < 10 M _sun yr^-1. There is no evidence for intrinsic evolution in the distribution of M _sstarf with redshift. We show that extinction by dust must be present in at least 25% of the GRB hosts in our sample and suggest that this is a way to reconcile our finding of a relatively lower UV-based, specific SFR (phi ≡ SFR/M _sstarf) with previous claims that GRBs have some of the highest phi values. We also examine the effect that the inability to resolve the star-forming regions in the hosts has on phi.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.

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