Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980stin...8512839m&link_type=abstract
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Astronomy and Astrophysics
Astronomy
Flux Density, Seyfert Galaxies, X Ray Astronomy, X Ray Sources, X Ray Spectra, Emission Spectra, Infrared Spectra, Luminous Intensity, Periodic Variations, Spectrophotometry, X Ray Density Measurement
Scientific paper
A new X-ray source, H0523-00, with the optically variable Seyfert 1 galaxy AKN 120 is identified. The source has a 2-10 keV X-ray flux of 2 x 10 to the -11th ergs/sq cm s which corresponds to a 2-10 keV X-ray luminosity of 10 to the 44th ergs/s. X-ray observations over a 1.5 year time span combined with contemporaneous optical photometry show a decrease in the optical with no corresponding decrease in the X-ray. In contrast, similar observations of MCG 8-11-11 show a contemporaneous decrease in optical and X-ray fluxes. It is noted that the infrared and X-ray spectral slopes for these two objects are similar, with the optical being steeper by roughly one unit.
Marshall Francis E.
Mushotzky Richard
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