{"paper":{"title":"GMASS Ultradeep Spectroscopy of Galaxies at 1.4<z<2. II. Superdense passive galaxies: how did they form and evolve ?","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Cimatti (Universita` di Bologna - Dipartimento di Astronomia), A. Franceschini (Universita` di Padova - Dipartimento di Astronomia), A. Renzini (INAF - OAPD), C. Halliday (INAF - OAA), E. Daddi (CEA Saclay), G. Rodighiero (Universita` di Padova - Dipartimento di Astronomia), G. Zamorani (INAF - OABO), J. Kurk (MPIA Heidelberg), L. Pozzetti (INAF - OABO), M. Bolzonella (INAF - OABO), M. Brusa (MPE Garching), M. Dickinson (NOAO), M. Mignoli (INAF - OABO), P. Cassata (LAM), P. Rosati (ESO), S. Berta (MPE Garching)","submitted_at":"2008-01-08T08:37:07Z","abstract_excerpt":"We combine ultradeep optical spectroscopy from the GMASS project (\"Galaxy Mass Assembly ultradeep Spectroscopic Survey\") with GOODS multi-band photometry and HST imaging to study a sample of passive galaxiesat 1.39<z<1.99 selected at 4.5 microns. A stacked spectrum with an equivalent integration time of ~500 hours was obtained is publicly released. The spectral and photometric SED properties indicate very weak or absent star formation, moderately old stellar ages of ~1 Gyr (for solar metallicity) and stellar masses in the range of 10^{10-11} solar masses, thus implying that the major star form"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0801.1184","kind":"arxiv","version":1},"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"}