Titre du document

Can the Sub-millimetre Background Radiation be Cosmological?

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Nom du Corpus

AstroConcepts

Auteur(s)
  • LAWRENCE J. CAROFF
  • VAH PETROSIAN
Résumé

THE observed spectrum of the microwave background radiation1 and the observations of interstellar absorption lines2 point to a thermal origin, while the extreme isotropy of this radiation, not easily consistent with superposition of emission from discrete sources34, suggests that the microwave background is primordial. If so, the recent observations at sub-millimetre wavelengths (Shivanandan et al.5, Houck and Harwit6 and Muehlner and Weiss7) must have a different origin. Processes before or during the recombination epoch cannot distort a primordial blackbody spectrum to the extent indicated by the sub-millimetre observations8,9. If the observed isotropy6 of the sub-millimetre flux (I/I 0.5 within a beamwidth 0.008 steradians11) is an indication of its extragalactic origin, it must have been produced at an epoch later than the recombination epoch and probably after or during the formation of galaxies, but, in this case, it may be due to superposition of radiation from discrete sources. Another possibility is that the sub-millimetre flux is due to some optically thick resonant line in the galaxy10, or to several lines within a narrow band of frequency. Finally, a recent observation from Mauna Kea shows a background emission feature near 870 m, consistent with ref. 7 and possibly attributable to atmospheric N2O (I. Nolt, private communication). This observation was, however, made from a low altitude ( 5 km), where the infrared N2O column density is high and not well determined (M. Werner, private communication). These observations need verification.

Langue(s) du document
Indéterminé
Année de publication
1971
Revue

Nature

Éditeur
Nature
Type de publication
journal
Type de document
other
Présence de XML structuré
Oui
Version de PDF
1.4
Score de qualité du texte
4.849
Nom du concept
  • Active galaxies
Catégories Science-Metrix
  • 1 - general ; 2 - general science & technology ; 3 - general science & technology
Catégories Inist
  • 1 - sciences appliquees, technologies et medecines ; 2 - sciences biologiques et medicales ; 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - General ; 2 - Multidisciplinary ; 3 - Multidisciplinary
Catégories WoS
  • 1 - science ; 2 - multidisciplinary sciences
Identifiant ISTEX
7582760C494DA5C36B221FC491475FF814619DFC
ark:/67375/GT4-BQV7QB4B-M
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