{"paper":{"title":"On the distribution of stellar masses in gamma-ray burst host galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"2), 3), D. Malesani (1), D. Watson (1), J. Gorosabel (4), J. Hjorth (1), J. M. Castro Cer\\'on (1, J. P. U. Fynbo (1), M. J. Micha{\\l}owski (1, M. Morales Calder\\'on (5); ((1) Dark Cosmology Centre (NBI) Copenhagen; (2) Herschel Science Centre (ESA/ESAC) Madrid; (3) Institute for Astronomy (ROE) Edinburgh; (4) Instituto de Astrof\\'isica de Andaluc\\'ia (CSIC) Granada; (5) Spitzer Science Centre (Caltech) Pasadena)","submitted_at":"2008-03-17T11:31:41Z","abstract_excerpt":"We analyse Spitzer images of 30 long-duration gamma-ray burst (GRB) host galaxies. We estimate their total stellar masses (M*) based on the rest-frame K-band luminosities (L_Krest) 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_Krest = 0.45 Msun/Lsun. We find that the hosts are low M*, star-forming systems. The median M* in our sample (<M*> = 10^9.7 Msun) is lower than that of \"field\" galaxies (e.g., Gemini Deep Deep Survey). The range spanned by M* is 10^7 Msun < M* < 10^11 Msun, while the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0803.2235","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}