The Ultraviolet Luminosity Density of the Universe from Photometric Redshifts of Galaxies in the Hubble Deep Field

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dc.creatorPascarelle, Sebastian M.
dc.creatorLanzetta, Kenneth M.
dc.creatorFernandez-Soto, Alberto
dc.date1998-10-06
dc.date.accessioned2026-07-07T02:28:13Z
dc.date.available2026-07-07T02:28:13Z
dc.descriptionStudies of the Hubble Deep Field (HDF) and other deep surveys have revealed an apparent peak in the ultraviolet (UV) luminosity density, and therefore the star-formation rate density, of the Universe at redshifts 1<z<2. We use photometric redshifts of galaxies in the HDF to determine the comoving UV luminosity density and find that, when errors (in particular, sampling error) are properly accounted for, a flat distribution is statistically indistinguishable from a distribution peaked at z~1.5. Furthermore, we examine the effects of cosmological surface brightness (SB) dimming on these measurements by applying a uniform SB cut to all galaxy fluxes after correcting them to redshift z=5. We find that, comparing all galaxies at the same intrinsic surface brightness sensitivity, the UV luminosity density contributed by high intrinsic SB regions increases by almost two orders of magnitude from z~0 to z~5. This suggests that there exists a population of objects with very high star formation rates at high redshifts that apparently do not exist at low redshifts. The peak of star formation, then, likely occurs somewhere beyond z>2.
dc.description12 pages, 2 figures, LaTeX style file included, accepted for publication in ApJ Letters, vol. 508, November 10
dc.identifierhttps://arxiv.org/abs/astro-ph/9810060
dc.identifierhttp://arxiv.org/abs/astro-ph/9810060
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13027
dc.subjectAstrophysics
dc.titleThe Ultraviolet Luminosity Density of the Universe from Photometric Redshifts of Galaxies in the Hubble Deep Field
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