Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315...46f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 46-67. CNR-supported research.
Astronomy and Astrophysics
Astronomy
113
Astronomical Spectroscopy, Spiral Galaxies, X Ray Astronomy, Galactic Nuclei, Galactic Radiation, Spatial Distribution, Spectrum Analysis, X Ray Spectra
Scientific paper
The results of a spatial and spectral analysis of a sample of spiral galaxies observed in X-rays with the Einstein satellite indicate that the X-ray emission is generally extended and complex. In some cases, discrete, very bright X-ray sources are detected, some of these coincident with the nuclear regions. The spectral fit of the IPC data to a thermal bremsstrahlung spectrum with a low-energy absorption cutoff shows that the average spectrum could be rather hard with kT greater than 2 keV, and with low-energy cutoff consistent with line-of-sight absorption. Results on NGC 4631, NGC 6946, and the nuclei of IC 342 and NGC 1313 are discussed and compared with previous observations in different energy ranges.
Fabbiano Giuseppina
Trinchieri Ginevra
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