Imaging of a Lyman-alpha absorption cloud in front of the radio galaxy 4C41.17

Details Imaging of a Lyman-alpha absorption cloud in front of the radio galaxy 4C41.17 Imaging of a Lyman-alpha absorption cloud in front of the radio galaxy 4C41.17

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.362..224h&link_type=abstract

Nature (ISSN 0028-0836), vol. 362, no. 6417, p. 224-226.

Physics

26

Cosmic Gases, Ionized Gases, Lyman Alpha Radiation, Radiation Absorption, Radio Galaxies, Absorption Spectra, Line Spectra, Red Shift

Scientific paper

Extragalactic objects suggestive of highly ionized gas clouds or gas-rich protogalaxies have been noted in the 'y-alpha forest' quasar-absorption lines; different types of measurement have yielded highly discrepant numbers for the typical diameter, and nothing is known about these clouds' shapes that could suggest their origin. It is presently noted that the observation of enormous, luminous Ly-alpha haloes around some high-redshift radio galaxies furnishes a novel source of information about Lyman cloud size and shape, by serving as light screens against which absorbing clouds can be seen as dark shadows. Attention is given to the possible detection of such an absorbing cloud.

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