Correlations in the Far Infrared Background

Details Correlations in the Far Infrared Background Correlations in the Far Infrared Background

1999-06-25

arxiv.org/abs/astro-ph/9906399v3

Astrophys.J.530:124,2000

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures included, uses emulateapj.sty. More models explored than in original version. Accepted for publication in A

Scientific paper

10.1086/308374

We compute the expected angular power spectrum of the cosmic Far Infrared Background (FIRB). We find that the signal due to source correlations dominates the shot--noise for $\ell \la 1000$ and results in anisotropies with rms amplitudes $(\sqrt{\ell(\ell+1)C_\ell/2\pi})$ between 5% and 10% of the mean for $l \ga 150$. The angular power spectrum depends on several unknown quantities, such as the UV flux density evolution, optical properties of the dust, biasing of the sources of the FIRB, and cosmological parameters. However, when we require our models to reproduce the observed DC level of the FIRB, we find that the anisotropy is at least a few percent in all cases. This anisotropy is detectable with proposed instruments, and its measurement will provide strong constraints on models of galaxy evolution and large-scale structure at redshifts up to at least $z \sim5$.

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