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Titolo:
The submillimetre extragalactic background light and the star-formation history of the Universe
Autore:
Cowie, LL; Barger, AJ;
Indirizzi:
Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA Univ Hawaii Honolulu HI USA 96822 ii, Inst Astron, Honolulu, HI 96822 USA
Titolo Testata:
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
fascicolo: 1772, volume: 358, anno: 2000,
pagine: 2133 - 2141
SICI:
1364-503X(20000715)358:1772<2133:TSEBLA>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
ULTRALUMINOUS IRAS GALAXIES; HUBBLE-DEEP-FIELD; HIGH-REDSHIFT; MOLECULAR GAS; INFRARED GALAXIES; EVOLUTION; EMISSION; COUNTS; IDENTIFICATION; TELESCOPE;
Keywords:
submillimetre imaging; redshift evolution; extragalactic background light;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Cowie, LL Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA Univ Hawaii 2680 Woodlawn Dr Honolulu HI USA 96822 HI 96822 USA
Citazione:
L.L. Cowie e A.J. Barger, "The submillimetre extragalactic background light and the star-formation history of the Universe", PHI T ROY A, 358(1772), 2000, pp. 2133-2141

Abstract

The submillimetre extragalactic background light is comparable with or exceeds that of the optical and ultraviolet (UV) wavelength ranges, showing directly that much of the energy radiated by star formation and active galactic nuclei is moved to far-infrared wavelengths. However, it is only as thisbackground at 850 mu m has been resolved with direct submillimetre imagingthat we have seen that it is largely created by a population of ultraluminous (or near-ultraluminous) infrared galaxies, which appear to lie at relatively high redshifts (z > 1). Mapping the redshift evolution of this major portion of universal star formation has been difficult because of the poor submillimetre spatial resolution, but this difficulty can be overcome by using extremely deep centimetre continuum radio observations to obtain precise astrometric information, since the bulk of the brighter submillimetre sources have detectable radio counterparts. With this precise position information available, we find that most of the submillimetre sources are extremely faint in the optical and near-infrared (I much greater than 24 and K = 21-22) and inaccessible to optical spectroscopy. Rough photometric redshift estimates can be made from combined radio and submillimetre energy distributions. We shall refer to this procedure as millimetric redshift estimation to distinguish it from photometric estimators in the optical and near-infrared. These estimators place the bulk of the submillimetre population at z = 1-3, where it corresponds to the high-redshift tail of the faint centimetreradio population. While still preliminary, the results suggest that the submillimetre population appears to dominate the star formation in this redshift range by almost an order of magnitude over the mostly distinct populations selected in the optical/UV.

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Documento generato il 21/09/18 alle ore 08:46:27