Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-11-03
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
13 pages, 12 figures, Submitted to MNRAS
Scientific paper
Star-forming galaxies which are too faint to be detected individually produce intensity fluctuations in the cosmic background light at infrared,millimetre and radio wavelengths. This contribution needs to be taken into account as a foreground when using the primordial signal to constrain cosmological parameters. The extragalactic fluctuations are also interesting in their own right as they depend on the star formation history of the Universe and the way in which this connects with the formation of cosmic structure. We present a new framework which allows us to predict the occupation of dark matter haloes by star-forming galaxies and uses this information, in conjunction with an N-body simulation of structure formation, to predict the power spectrum of intensity fluctuations in the infrared background. We compute the emission from galaxies at far-infrared, millimetre and radio wavelengths. Our method gives accurate predictions for the clustering of galaxies both within and between dark matter haloes. The calculation presented uses a previously published galaxy formation model, and, without any adjustment of the model parameters, comes reasonably close to reproducing recent estimates of the extragalactic fluctuations in the background made from early data analysed by the Planck Collaboration, particularly at higher frequencies.
Baugh Carlton M.
Cole Shaun
Efstathiou George
Frenk Carlos S.
Kim Han-Seek
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