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29 March 2024
 
  » arxiv » astro-ph/0502153

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Measuring the Three-Dimensional Structure of Galaxy Clusters. I. Application to a Sample of 25 Clusters
E. De Filippis ; M. Sereno ; M.W.Bautz ; G. Longo ;
Date 8 Feb 2005
Journal Astrophys.J. 625 (2005) 108-120
Subject astro-ph
Affiliation2,3,4), M.W.Bautz , G. Longo (3,4) ( MIT; INAF-OAC; Universita’ di Napoli Federico II, Italy; INFN Napoli, Italy
AbstractWe discuss a method to constrain the intrinsic three-dimensionale shapes of galaxy clusters by combining X-Ray and Sunyaev-Zeldovich observations. The method is applied to a sample of 25 X-Ray selected clusters, with measured Sunyaev-Zeldovich temperature decrements. The sample turns out to be slightly biased, with strongly elongated clusters preferentially aligned along the line of sight. This result demonstrates that X-Ray selected cluster samples may be affected by morphological and orientation effects even if a relatively high threshold signal-to-noise ratio is used to select the sample. A large majority of the clusters in our sample exhibit a marked triaxial structure, with prolate-like shapes being slightly more likely than oblate-like ones; the spherical hypothesis is strongly rejected for most sample members. Cooling flow clusters do not show preferentially regular morphologies.
Source arXiv, astro-ph/0502153
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