Deep galaxy counts, extragalactic background light and the stellar baryon budget
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In this paper, the authors assess the constraints imposed by the observed extragalactic background light (EBL) on the cosmic history of star formation and the stellar-mass density today.Abstract:
We assess the constraints imposed by the observed extragalactic background light (EBL) on the cosmic history of star formation and the stellar-mass density today. The logarithmic slope of the galaxy number–magnitude relation from the Southern Hubble Deep Field imaging survey is flatter than 0.4 in all seven UBVIJHK optical bandpasses, i.e. the light from resolved galaxies has converged from the UV to the near-IR. We find a lower limit to the surface brightness of the optical extragalactic sky of about 15 nW m−2 sr−1, comparable to the intensity of the far-IR background from COBE data. Assuming a Salpeter initial mass function with a lower cut-off consistent with observations of M subdwarf disc stars, we set a lower limit of Ωg+sh2>0.0013 I50 to the visible (processed gas + stars) mass density required to generate an EBL at a level of 50 I50 nW m−2 sr−1; our ‘best-guess’ value is Ωg+sh2≈0.0031 I50. Motivated by the recent microlensing results of the MACHO collaboration, we consider the possibility that massive dark haloes around spiral galaxies are composed of faint white dwarfs, and show that only a small fraction (≲5 per cent) of the nucleosynthetic baryons can be locked in the remnants of intermediate-mass stars forming at zF≲5, as the bright early phases of such haloes would otherwise overproduce the observed EBL.read more
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Journal ArticleDOI
Galactic stellar and substellar initial mass function
TL;DR: A review of the present-day mass function and initial mass function in various components of the Galaxy (disk, spheroid, young, and globular clusters) and in conditions characteristic of early star formation is presented in this paper.
Journal ArticleDOI
Interpreting the Cosmic Infrared Background: Constraints on the Evolution of the Dust-enshrouded Star Formation Rate
Ranga-Ram Chary,David Elbaz +1 more
TL;DR: In this article, the evolution of the mid-infrared local luminosity function with redshift to the spectrum of the cosmic infrared background (CIRB) at j[ 5 km and the galaxy counts from various surveys at midinfrared, far infrared, and submillimeter wavelengths was investigated.
Journal ArticleDOI
Extragalactic optical-infrared background radiation, its time evolution and the cosmic photon-photon opacity
TL;DR: In this article, the authors have modelled the extragalactic optical and infrared backgounds using available information on cosmic sources in the universe from far-UV to sub-millimeter wavelengths over a wide range of cosmic epochs, and applied their photon-photon opacity estimates to the analysis of spectral data at TeV energies on a few BLAZARs of particular interest.
Journal ArticleDOI
THE COSMIC INFRARED BACKGROUND: Measurements and Implications ⁄
Michael G. Hauser,Eli Dwek +1 more
TL;DR: The cosmic infrared background records much of the radiant energy released by processes of structure formation that have occurred since the decoupling of matter and radiation following the Big Bang as discussed by the authors, with additional constraints coming from studies of the attenuation of TeV γ-rays.
Journal ArticleDOI
Extragalactic background light inferred from AEGIS galaxy-SED-type fractions
Aaron Dominguez,Aaron Dominguez,Joel R. Primack,David J. Rosario,Francisco Prada,Rudy C. Gilmore,Rudy C. Gilmore,Sandra M. Faber,David C. Koo,Rachel S. Somerville,Miguel A. Pérez-Torres,Pablo G. Pérez-González,J.-S. Huang,Marc Davis,Puragra Guhathakurta,Pauline Barmby,Christopher J. Conselice,Manuel Lozano,Jeffrey A. Newman,Michael C. Cooper +19 more
TL;DR: In this article, the evolution of the spectrum of the EBL between 0.1 and 1000 µm has been determined directly from galaxy spectral energy distribution (SED) observations over a wide redshift range.
References
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