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Title:
Galaxy Counts on the Cosmic Microwave Background Cold Spot
Authors:
Granett, Benjamin R.; Szapudi, István; Neyrinck, Mark C.
Affiliation:
AA(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA ), AB(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA), AC(Department of Physics and Astronomy, Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218, USA)
Publication:
The Astrophysical Journal, Volume 714, Issue 1, pp. 825-833 (2010). (ApJ Homepage)
Publication Date:
05/2010
Origin:
IOP
Astronomy Keywords:
cosmic background radiation, cosmology: observations, large-scale structure of universe, methods: statistical
DOI:
10.1088/0004-637X/714/1/825
Bibliographic Code:
2010ApJ...714..825G

Abstract

The cold spot on the cosmic microwave background (CMB) could arise due to a supervoid at low redshift through the integrated Sachs-Wolfe effect. We imaged the region with MegaCam on the Canada-France-Hawaii Telescope and present galaxy counts in photometric redshift bins. We rule out the existence of a 100 Mpc radius spherical supervoid with underdensity delta = -0.3 at 0.5 < z < 0.9 at high significance. The data are consistent with an underdensity at low redshift, but the fluctuations are within the range of cosmic variance and the low-density areas are not contiguous on the sky. Thus, we find no strong evidence for a supervoid. We cannot resolve voids smaller than a 50 Mpc radius; however, these can only make a minor contribution to the CMB temperature decrement.
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