A redshift survey towards the cosmic microwave background cold spot

被引：27

作者：

Bremer, M. N. ^{[1
]}

Silk, J. ^{[2
]}

Davies, L. J. M. ^{[1
]}

Lehnert, M. D. ^{[3
]}

机构：

[1] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[2] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[3] Observ Paris, Phys & Instrumentat GEPI, Lab Etud Galaxies, UMR8111, F-92195 Meudon, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2010年 / 404卷 / 01期

关键词：

galaxies: distances and redshifts; cosmic microwave background; large-scale structure of Universe; VLT DEEP SURVEY; ANISOTROPY-PROBE; RADIO-SOURCES;

D O I：

10.1111/j.1745-3933.2010.00837.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have carried out a redshift survey using the VIMOS spectrograph on the VLT towards the cosmic microwave background cold spot. A possible cause of the cold spot is the Integrated Sachs-Wolfe effect imprinted by an extremely large void (hundreds of Mpc in linear dimension) at intermediate or low redshifts. The redshift distribution of over seven hundred z < 1 emission-line galaxies drawn from an I-band flux limited sample of galaxies in the direction of the cold spot shows no evidence of a gap on scales of Delta z greater than or similar to 0.05 as would be expected if such a void existed at 0.35 < z < 1. There are troughs in the redshift distribution on smaller scales (Delta z approximate to 0.01) indicating that smaller scale voids may connect regions separated by several degrees towards the cold spot. A comparison of this distribution with that generated from similarly sized subsamples drawn from widely spaced pointings of the VVDS survey does not indicate that the redshift distribution towards the cold spot is anomalous or that these small gaps can be uniquely attributed to real voids.

引用

页码：L69 / L73

页数：5

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