Abstract Clusters of galaxies are filled with a hot teneous plasma which is emitting soft X-rays over very extended regions. The ROSAT observatory with its high resolution and high sensitivity X-ray telescope allows to image nearby clusters in great detail and is therefore ideally suited to study the structure and morphology of galaxy clusters. In particular the distribution of the intracluster gas can be mapped, some information on the temperature structure of the gas can be obtained, the gravitational mass can be infered, and the dynamical state of the clusters can be investigated. Results of such studies for some nearby clusters as Virgo, Perseus and Coma are presented. Gas mass fractions of the total gravitational mass of the cluster in excess of 10 to 15% are infered from X-ray observations where the cluster emission can be traced out to an Abell radius (3 Mpc). If these values are taken to be representative for the matter composition in the Universe it has interesting consequences for cosmology as for example for the nucleosythesis models and the mean density of the Universe.


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    Titel :

    ROSAT observations of galaxy clusters and cosmological implications


    Beteiligte:
    Böhringer, H. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 13 , 12 ; 181-190


    Erscheinungsdatum :

    01.01.1993


    Format / Umfang :

    10 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    ROSAT Observations of Galaxy Clusters and Cosmological Implications

    Boehringer, H. / COSPAR | British Library Conference Proceedings | 1993




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    ROSAT observations of X-ray sources in globular clusters

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