Journal Article

Issues in joint SZ and optical cluster finding

J. D. Cohn and Martin White

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 393, issue 2, pages 393-405
Published in print February 2009 | ISSN: 0035-8711
Published online February 2009 | e-ISSN: 1365-2966 | DOI:
Issues in joint SZ and optical cluster finding

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We apply simple optical and SZ (Sunyaev–Zel'dovich) cluster finders to mock galaxy catalogues and SZ flux maps created from dark matter haloes in a (1 h−1 Gpc)3 dark matter simulation, at redshifts 0.5 and 0.9. At each redshift, the two catalogues are then combined to assess how well they can improve each other, and compared to several variants of catalogues made using SZ flux and galaxy information simultaneously. We use several different criteria to compare the catalogues, and illustrate some of the tradeoffs which arise in tuning the galaxy cluster finders with respect to these criteria. We detail many of the resulting improvements and issues which arise in comparing and combining these two types of data sets.

Keywords: galaxies: clusters: general; cosmological parameters; cosmology: theory

Journal Article.  11112 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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