Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...354...52d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 354, May 1, 1990, p. 52-57.
Astronomy and Astrophysics
Astronomy
50
Distance, Galactic Evolution, Luminosity, X Ray Astronomy, Emission Spectra, Mass To Light Ratios, Virgo Galactic Cluster, Visible Spectrum
Scientific paper
Using new apparent magnitudes and new distances as determined from the Dn-sigma method, the correlation of X-ray to optical luminosities is reexamined for E and SO galaxies. The residuals about the least-squares fits decline significantly but are not removed altogether. All attempts to correlate the remaining residuals with other structural and spectral parameters have given negative results, suggesting that some other, as yet unidentified, factor plays a role in defining X-ray luminosity with respect to optical luminosity. L(X) versus L(B) also appears to be a useful secondary distance indicator for early-type galaxies.
Donnelly Hank R.
Faber Sandra M.
O'Connell R. M.
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