Apparent and actual galaxy cluster temperatures |
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| Authors: | Andrew R Liddle Pedro T P Viana A Kathy Romer Robert G Mann |
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| Institution: | ;1Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QJ;2Centro de Astrofísica da Universidade do Porto, Rua das Estrelas s/c, 4100 Porto, Portugal;3Physics Department, Carnegie Mellon University, Pittsburgh PA 15213, USA;4Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 9HJ |
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| Abstract: | The redshift evolution of the galaxy cluster temperature function is a powerful probe of cosmology. However, its determination requires the measurement of redshifts for all clusters in a catalogue, which is likely to prove challenging for large catalogues expected from XMM-Newton , which may contain of the order of 2000 clusters with measurable temperatures, distributed around the sky. In this paper we study the apparent cluster temperature, which can be obtained without cluster redshifts. We show that the apparent temperature function itself is of limited use in constraining cosmology, and so concentrate our focus on studying how apparent temperatures can be combined with other X-ray information to constrain the cluster redshift. We also briefly study the circumstances under which the non-thermal spectral features can provide redshift information. |
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| Keywords: | galaxies: clusters: general |
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