Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296..447t&link_type=abstract
Astrophysical Journal, Vol.296, NO. 2/SEP15, P. 447, 1985
Astronomy and Astrophysics
Astrophysics
144
Scientific paper
The statistical analysis of a sample of 29 elliptical and S0 field galaxies observed with the Einstein observatory is presented. The data show a correlation between the X-ray and the optical blue luminosity of the form lx ∝ lB1.64 ±0.15. This is significantly steeper than the correlation observed in spiral and irregular galaxies: lx ∝ lB1.08 ±0.07. Several mechanisms for the origin of the X-ray emission in these galaxies have been investigated to explain the observed correlation. Most likely two separate mechanisms are present: thermal radiation from hot gas is required to explain the high-luminosity massive objects (M > 5 x 1011 Msun, Lx, 1041 ergs s -1), while a collection of low-mass binary sources can explain the low-luminosity, low-mass objects. A comparison between radio-loud and radio-quiet galaxies shows that high optical luminosity, or high mass, is required for the onset of nuclear activity, at both radio and X-ray wavelengths. However, this is not sufficient to ensure the presence of active nuclear sources, and a second parameter (at least) is needed. A comparison between radio-loud elliptical galaxies and QS0s shows that the same X-ray emission mechanism that is operating in QSQs could explain the high X-ray luminosity end of the radio-loud galaxy distribution.
Fabbiano Giuseppina
Trinchieri Ginevra
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