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Date and Time of the Query: 2019-03-21 T08:37:12 PDT
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For refcode 1990ApJ...354...52D:
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1990ApJ...354...52D THE CORRELATION OF X-RAY AND OPTICAL LUMINOSITIES OF EARLY-TYPE GALAXIES USING NEW DATA AND DISTANCES R. HANK DONNELLY, S. M. FABER, AND R. M. O'CONNELL University of California Observatories/Lick Observatory Board of Studies in Astronomy and Astrophysics, University of California at Santa Cruz Received 1989 June 16; accepted 1989 October 30 ABSTRACT Using new apparent magnitudes and new distances as determined from the D_n_^-{sigma}^ method, we have reexamined the correlation of X-ray to optical luminosities for E and S0 galaxies. The residuals about our 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. Subject headings: galaxies: distances - galaxies: photometry - galaxies: X- rays
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