Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249p..21f&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, March 15, 1991, p. 21P-23P. Research supported by
Astronomy and Astrophysics
Astronomy
13
Dark Matter, Hydrogen Ions, Iue, Photons, Quasars, Ultraviolet Astronomy, Emission Spectra, Galactic Clusters, Luminosity, X Ray Spectra
Scientific paper
Dark matter which produces hydrogen-ionizing photons on a time-scale of 2 x 10 to the 23rd s has been shown to explain many problems in astronomy and cosmology. Clusters of galaxies composed of such dark matter will be luminous sources of ionizing photons. Here, the results of a search for an otherwise unidentified, extended emission-line in the IUE spectrum of the quasar 3C263 are reported. Optical imaging and spectroscopy of the quasar show that it lies at the center of a moderately rich cluster of galaxies. No line was detected. Either the central surface density of dark matter in the cluster is less than 0.34 g/sq cm or the decay lifetime of the dark matter exceeds the above estimate. Alternatively, the line may be absorbed by cold clouds similar to those recently discovered with X-ray spectra of nearby clusters.
Fabian Andrea C.
Naylor Tim
Sciama Dennis W.
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