Ariel V X-ray observations of two type I Seyfert galaxies

Details Ariel V X-ray observations of two type I Seyfert galaxies Ariel V X-ray observations of two type I Seyfert galaxies

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.192p...1h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 192, July 1980, p. 1P-6P.

Astronomy and Astrophysics

Astronomy

8

Seyfert Galaxies, Spaceborne Astronomy, X Ray Sources, X Ray Spectra, Ariel 5 Satellite, Hubble Constant, Radiant Flux Density, Red Shift, Stellar Luminosity

Scientific paper

X-ray spectra of the type I Seyfert galaxies ESO 012-G21 and Markarian 464 obtained by the proportional counter spectrometer on board Ariel 5 are presented. ESO 012-G21 is found to have an X-ray luminosity of 1.5 x 10 to the 44th erg/sec at a redshift of 0.03 and a Hubble constant of 50 km/sec per Mpc, and is identified with the X-ray source 3U 0055-79. An X-ray luminosity varying within a year from 3 to 0.9 x 10 to the 44th erg/sec has been obtained for Mkn 464, and a column of absorbing of around 2.5 x 10 to the 23 H atoms/sq cm has been detected in front of the source. Evidence for a low energy cut-off in the X-ray spectrum of Mkn 464 is also noted.

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