The general formalism relevant for studies of the contributions to the background of extragalactic sources is summarized. Analytic formulae, useful to highlight some basic aspects, are presented; many of them were, to our knowledge, never published before. In particular we point out and discuss the effect on source counts of a luminosity dependent K-correction, such as that appropriate for rich clusters of galaxies, and of a spectrum steeply increasing towards high frequencies as is the case for the sub-mm/mm spectrum of galaxies. Also we derive simple analytic approximations useful to compute the contribution of clustering to small scale fluctuations.

Extragalactic backgrounds .1. General formalism

Danese, Luigi
1996-01-01

Abstract

The general formalism relevant for studies of the contributions to the background of extragalactic sources is summarized. Analytic formulae, useful to highlight some basic aspects, are presented; many of them were, to our knowledge, never published before. In particular we point out and discuss the effect on source counts of a luminosity dependent K-correction, such as that appropriate for rich clusters of galaxies, and of a spectrum steeply increasing towards high frequencies as is the case for the sub-mm/mm spectrum of galaxies. Also we derive simple analytic approximations useful to compute the contribution of clustering to small scale fluctuations.
1996
35
4
289
303
Dezotti, G; Franceschini, A; Toffolatti, L; Mazzei, P; Danese, Luigi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/15805
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