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Mapping the Cosmic Web with the largest all-sky surveys

Published online by Cambridge University Press:  12 October 2016

Maciej Bilicki ,
John A. Peacock ,
Thomas H. Jarrett ,
Michelle E. Cluver  and
Louise Steward
Maciej Bilicki
Affiliation:
Department of Astronomy, University of Cape Town, South Africa, email: maciek@ast.uct.ac.za Kepler Institute of Astronomy, University of Zielona Góra, Poland
John A. Peacock
Affiliation:
Institute for Astronomy, University of Edinburgh, United Kingdom
Thomas H. Jarrett
Affiliation:
Department of Astronomy, University of Cape Town, South Africa, email: maciek@ast.uct.ac.za
Michelle E. Cluver
Affiliation:
Department of Astronomy, University of Cape Town, South Africa, email: maciek@ast.uct.ac.za
Louise Steward
Affiliation:
Department of Astronomy, University of Cape Town, South Africa, email: maciek@ast.uct.ac.za
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Abstract

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Our view of the low-redshift Cosmic Web has been revolutionized by galaxy redshift surveys such as 6dFGS, SDSS and 2MRS. However, the trade-off between depth and angular coverage limits a systematic three-dimensional account of the entire sky beyond the Local Volume (z < 0.05). In order to reliably map the Universe to cosmologically significant depths over the full celestial sphere, one must draw on multiwavelength datasets and state-of-the-art photometric redshift techniques. We have undertaken a dedicated program of cross-matching the largest photometric all-sky surveys – 2MASS, WISE and SuperCOSMOS – to obtain accurate redshift estimates of millions of galaxies. The first outcome of these efforts – the 2MASS Photometric Redshift catalog (2MPZ, Bilicki et al. 2014a) – has been publicly released and includes almost 1 million galaxies with a mean redshift of z=0.08. Here we summarize how this catalog was constructed and how using the WISE mid-infrared sample together with SuperCOSMOS optical data allows us to push to redshift shells of z∼ 0.2 –0.3 on unprecedented angular scales. Our catalogs, with ∼ 20 million sources in total, provide access to cosmological volumes crucial for studies of local galaxy flows (clustering dipole, bulk flow) and cross-correlations with the cosmic microwave background such as the integrated Sachs-Wolfe effect or lensing studies.

Keywords

catalogssurveysgalaxies: distances and redshiftstechniques: photometricmethods: data analysis(cosmology:) large-scale structure of universecosmology: observations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 143 - 148
Copyright
Copyright © International Astronomical Union 2016 

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