Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284...65f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. 65-74.
Astronomy and Astrophysics
Astronomy
49
Galactic Evolution, Galactic Structure, Radio Galaxies, Spiral Galaxies, X Ray Astronomy, Emission Spectra, Spectral Energy Distribution, Visible Spectrum
Scientific paper
The results of X-ray observations carried out with the Einstein satellite of 14 nearby field spiral and irregular galaxies are reported. The integrated properties of the galaxies are examined in the luminosity range from 10 to the 38th and 10 to the 40th ergs per sec at 0.5-3.0 keV. It is found that the X-ray luminosities of the galaxies are correlated with both the optical (blue) and the radio luminosities (1.4 GHz). The linear relationship found between the X-ray and the optical blue luminosities suggests a relationship to be between the X-ray luminosity and the stellar content of spiral galaxies exhibiting blue luminosities. On the basis of the correlations, it is proposed that most of the spiral galaxies are relatively young systems of not less than about 10 to the 9th years. Data obtained from the Einstein satellite and those of a previous investigation of the blue galaxies are compared in a table.
Fabbiano Giuseppina
Macdonald Alan
Trinchieri Ginevra
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