Mathematics – Probability
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1019h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, May 1986, p. 1019-1025.
Mathematics
Probability
9
Active Galaxies, Elliptical Galaxies, Seyfert Galaxies, Spectrum Analysis, Visible Spectrum, X Ray Spectra, Astronomical Spectroscopy, Balmer Series, Emission Spectra, Galactic Nuclei, H Alpha Line, Periodic Variations, Radio Spectra
Scientific paper
Optical observations of the elliptical galaxy NGC 6212 show it to be a type 1 Seyfert galaxy at z = 0.030, not a BL Lac object as suggested by Biermann, Strom, and Bartel (1985). The X-ray luminosity in the 0.3 - 3.5 keV band varies between 2x1042 and 8x1042erg s-1 over a period of months. One purpose of this paper is to emphasize that the X-ray variability and relatively weak radio emission of NGC 6212 are not unusual for Seyfert galaxies. In the absence of optical spectroscopy, the a priori probability that an object with the X-ray and radio properties of NGC 6212 will turn out to be a BL Lac object is much smaller than the probability that it will be a Seyfert galaxy.
Filippenko Alexei V.
Halpern Jules P.
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