Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..253u&link_type=abstract
Astronomical Journal, vol. 88, Mar. 1983, p. 253-259.
Astronomy and Astrophysics
Astronomy
24
Astronomical Spectroscopy, Emission Spectra, Galactic Nuclei, Line Spectra, Markarian Galaxies, Seyfert Galaxies, X Ray Sources, Early Stars, H Ii Regions, H Lines, Spectrophotometry, Visible Spectrum
Scientific paper
The X-ray and optical properties of a selection of compact nucleus, emission line Markarian galaxies have been studied. Observations with the Einstein Observatory have detected X-rays from all the Seyfert galaxies and none of the narrow emission line galaxies in the sample. This result supports the idea that powerful X-ray emission is correlated with the presence of a broad optical emission line component. The emission line spectra of the Seyfert galaxies show much higher excitation than do the narrow-line galaxies, whose spectra are similar to those of H II regions. Both the optical properties and the radio and X-ray upper limits of the non-Seyfert galaxies are consistent with the suggestion that those objects have undergone bursts of massive star formation.
Ulvestad James S.
Wilson Andrew S.
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