Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259...67a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 1, p. 67-81.
Astronomy and Astrophysics
Astronomy
99
Astronomical Spectroscopy, Galactic Clusters, Rosat Mission, X Ray Sources, B Stars, Emission Spectra, H Alpha Line, Red Shift, Sky Surveys (Astronomy), Spaceborne Astronomy
Scientific paper
Results are given from the first stage of an optical follow-up study of the X-ray brightest clusters of galaxies detected in the Rosat All-Sky Survey (RASS). The redshifts of the central galaxies in 29 of the X-ray brightest Abell and Zwicky clusters in the RASS have been measured using the Faint Object Spectrograph on the Isaac Newton Telescope. Approximately 40 percent of the central galaxy spectra obtained show strong optical line emission. In several cases, this emission is spectacular. The central cluster galaxy in Zwicky 3146 is the most luminous such galaxy in optical lines yet discovered, having an H -alpha luminosity approximately twice that of NGC 1275. The link between optical line emission and the presence of an excess of blue continuum flux in the spectra is reexamined; the two are found to be correlated. The spectral shape of the excess flux is well matched by B stars.
Allen Steven W.
Böhringer Hans
Crawford Carolin S.
Ebeling Harald
Edge Alastair C.
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