1997/09/15 by Piero Madau, Madau, Piero · 1 citation
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Astrophysics (astro-ph) #Atmospheric Ozone and Climate #FOS: Physical sciences #History and Developments in Astronomy #Photocathodes and Microchannel Plates #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9709147
22 pages, 10 embedded postscript figures, LaTeX with PASP 'paspconf' style file. To appear in "The Hubble Deep Field", ed. M. Livio, S. M. Fall, & P. Madau, STScI Symposium Series
arxiv created 1997/09/15 · openalex publication_date 1997/09/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
I review a technique for interpreting faint galaxy data which traces the evolution with cosmic time of the galaxy luminosity density, as determined from several deep spectroscopic samples and the HDF. The method relies on the rest frame UV and near-IR continua of galaxies as indicators, for a given IMF and dust content, of their instantaneous SFR and total stellar mass, and offers the prospect of addressing in a coherent framework an important set of subjects: cosmic star formation history, dust in primeval galaxies, shape of the IMF, stellar mass-to-light ratios of present-day galaxies, extragalactic background light, Type II supernovae and heavy element enrichment history of the universe. The global spectrophotometric properties of field galaxies are well fit by a simple stellar evolution model, defined by a time-dependent SFR per unit comoving volume, a universal IMF which is relatively rich in massive stars, and a modest amount of dust reddening. The model is able to account for the entire background light recorded in the galaxy counts down to the very faint magnitude levels probed by the HDF, and produces visible mass-to-light ratios at the present epoch which are consistent with the values observed in nearby galaxies of various morphological types. The bulk (>60%) of the stars present today formed relatively recently (z<1.5), consistently with the expectations from a broad class of hierarchical clustering cosmologies, and in good agreement with the low level of metal enrichment observed at high redshifts in the damped Lyman-alpha systems. Throughout this review I emphasize how the poorly constrained amount of starlight that was absorbed by dust and reradiated in the far-IR at early epochs represents one of the biggest uncertainties in our understanding of the evolution of luminous matter in the universe.