Precision cosmology with a combination of wide and deep Sunyaev-Zeldovich cluster surveys

Details Precision cosmology with a combination of wide and deep Sunyaev-Zeldovich cluster surveys Precision cosmology with a combination of wide and deep Sunyaev-Zeldovich cluster surveys

2010-05-03

arxiv.org/abs/1005.0387v3

Physical Review D (Vol.82, No.4, 2010)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 figures, 1 table; revised version

Scientific paper

10.1103/PhysRevD.82.041301

We show the advantages of a wedding cake design for Sunyaev-Zel'dovich cluster surveys. We show that by dividing up a cluster survey into a wide and a deep survey, one can essentially recover the cosmological information that would be diluted in a single survey of the same duration due to the uncertainties in our understanding of cluster physics. The parameter degeneracy directions of the deep and wide surveys are slightly different, and combining them breaks these degeneracies effectively. A variable depth survey with a few thousand clusters is as effective at constraining cosmological parameters as a single depth survey with a much larger cluster sample.

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