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The Anisotropy in the distribution of Extragalactic Infrared Sources and Background

Published online by Cambridge University Press:  03 August 2017

P. de Bernardis ,
R. Fabbri ,
S. Masi ,
F. Melchiorri ,
B. Olivo  and
W. Pecorella
P. de Bernardis
Affiliation:
Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy
R. Fabbri
Affiliation:
Dipartimento di Fisica, Università degli studi, Firenze, Italy
S. Masi
Affiliation:
Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy
F. Melchiorri
Affiliation:
Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy
B. Olivo
Affiliation:
IFA-CNR, Roma, Italy
W. Pecorella
Affiliation:
Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy

Abstract

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We analyze the anisotropies in the extragalactic infrared background and in the source counts in standard cosmology perturbed by large-scale, small-amplitude density fluctuations. The dipole anisotropy of the diffuse background is connected to the dipole of the cosmic background radiation and of the source counts, and a full consistency with a large (≃ 7%) anisotropy in the IRAS source counts is found to imply a low density (Ω0 ≃ 0.2) universe, contrary to a previous claim. We analyze also higher order harmonics. Using the IRAS Low-Resolution All-Sky Maps we obtain an upper limit of 0.17MJy/sr on the dipole of the 100 μm background and show that it is consistent with a source-count anisotropy of 7% only for a low intensity, I ≤ 1.2 M Jy/sr, of the background itself.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 130: Large Scale Structures of the Universe , 1988 , pp. 15 - 23
Copyright
Copyright © Reidel 1988 

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