Galaxy stellar mass (bottom) and SFR (top) for LGRB host galaxies considered in this paper. The lines indicate the limits shown in the figures of Savaglio et al. (2009): The solid and dashed lines in the bottom panel show the stellar mass as a function of redshift of a galaxy with a K-band magnitude of 24.3 and either an old stellar population or constant SFR, respectively. In the top panel, the line represents an Hα or [O II] emission flux of 1.3 × 10-17 erg s-1 or 0.7 × 10-17 erg s-1, respectively, assuming a dust extinction in the visual band A(V) = 0.53. The shaded area indicates our selection criteria: We work at redshift lower than 1.1 and above a minimal value for the stellar masses and SFR, so that our sample is complete.
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