Detection of diffuse Lyman-alpha emission from the cD galaxy in Abell 1795

Details Detection of diffuse Lyman-alpha emission from the cD galaxy in Abell 1795 Detection of diffuse Lyman-alpha emission from the cD galaxy in Abell 1795

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135l...3n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 1, June 1984, p. L3-L6. Research supported by the Danish Space Resear

Astronomy and Astrophysics

Astronomy

18

Elliptical Galaxies, Galactic Clusters, Interstellar Gas, Lyman Alpha Radiation, Ultraviolet Astronomy, Diffuse Radiation, Emission Spectra, Galactic Structure, Stellar Evolution, Ultraviolet Spectra

Scientific paper

The authors report the discovery of diffuse Lyα emission from the cD galaxy in Abell 1795 which has a high X-ray derived mass accretion rate. The Lyα emission coincides with the main optical filamentary structures and the Lyα/Hβ ratio is close to the recombination value indicating a very low H I column density. The widely accepted assumption that the accreted mass ends up as stars is severely constrainted by the authors' UV observations. If star formation occurs at all, the IMF must be quite different from our Galaxy i.e. the formation of high mass stars (>3 M_sun;) must be less and the star formation process must be extremely efficient.

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