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Diffuse Lyα Emission around the cD Galaxy in A1795

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Clusters and Groups of Galaxies

Part of the book series: Astrophysics and Space Science Library ((ASSL,volume 111))

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Summary

We report briefly the discovery of diffuse Lyα emission coinciding with the optical filaments around the cD galaxy in the X-ray cluster A1795. The derived Lyα/Hβ ratio is close to the recombination value. From this ratio we find that the content of smoothly distributed HI is less than 100 solar masses. The non-detection of a stellar UV continuum implies that the formation rate of stars more massive than 3M⊙ is less than 1 per cent of the accretion rate. Combining UV, optical and radio data for the nonthermal nuclear source we find α ~.8.

Based on observations by the International Ultraviolet Explorer collected at the Villafranca Satellite Tracking Station of the European Space Agency.

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Authors and Affiliations

  1. Copenhagen University Observatory, Øster Voldgade 3, DK-1350, Copenhagen K, Denmark

    H. U. Nørgaard-Nielsen, H. E. Jørgensen & L. Hansen

Authors
  1. H. U. Nørgaard-Nielsen
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  2. H. E. Jørgensen
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  3. L. Hansen
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Editor information

Editors and Affiliations

  1. Osservatorio Astronomico di Trieste, Via Tiepolo 11, 34131, Trieste, Italy

    F. Mardirossian , G. Giuricin  & M. Mezzetti ,  & 

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© 1984 D. Reidel Publishing Company

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Nørgaard-Nielsen, H.U., Jørgensen, H.E., Hansen, L. (1984). Diffuse Lyα Emission around the cD Galaxy in A1795. In: Mardirossian, F., Giuricin, G., Mezzetti, M. (eds) Clusters and Groups of Galaxies. Astrophysics and Space Science Library, vol 111. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6412-9_65

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  • DOI: https://doi.org/10.1007/978-94-009-6412-9_65

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-009-6414-3

  • Online ISBN: 978-94-009-6412-9

  • eBook Packages: Springer Book Archive

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