Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..553j&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 553 - 556
Astronomy and Astrophysics
Astrophysics
6
Clusters Of Galaxies: Hubble Constant, Clusters Of Galaxies: X Rays
Scientific paper
Estimation of H0 from X-ray and Sunyaev-Zel'dovich observations of a cluster requires the co-fitting of the data with a cluster structure model. The data are now sufficiently good that naïve models are becoming inadequate, and the authors are developing a model in which the X-ray emission measure is used to help constrain the line-of-sight gas distribution. A model is presented which produces a good fit to Abell 1413, which contains a moderate cooling flow. The authors nevertheless emphasise that a secure estimate of H0 will come only after study of a sample of clusters. They further present evidence supporting the notion that radio halos result from merging clusters; spectral measurements of the radio halo in Abell 665 constrain the age of the halo to be less than 1.2×108yr. The homogenised temperature distributions of recently merged clusters make them good candidates for H0 estimation.
Jones Malcolm
Saunders Renee
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