HEAO-1 spectra of X-ray emitting Seyfert 1 galaxies

Details HEAO-1 spectra of X-ray emitting Seyfert 1 galaxies HEAO-1 spectra of X-ray emitting Seyfert 1 galaxies

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979stin...7931117m&link_type=abstract

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Computer Science

Cosmic X Rays, Galactic Radiation, Heao 1, Seyfert Galaxies, X Ray Spectra, Background Radiation, Bremsstrahlung, Diffuse Radiation, Light Emission, Proportional Counters, Variability, X Ray Density Measurement

Scientific paper

The A-2 experiment on HEAO-1 determined spectral parameters for seven Seyfert 1 galaxies: NGC3783, NGC4151, NGC5548, NGC6814, MK509, MCG8-11-11, and ES0141-G55. The X-ray spectra above 5 keV can be well fit by power laws of energy index alpha between .3 and 1.0 and, with the exception of MK509, by a high temperature (kt 15 keV) thermal bremsstrahlung spectrum. The column densities, with the exception of NGC4151, are less than 5 x 10 to the 22nd power at/sq cm with only the low luminosity objects having measurable columns. Galaxy ES0141-G55 showed a strong soft X-ray excess in March 1978 similar to that seen in the BL lac object MK421. Variability on a six month time scale was exhibited by MCG8-11-11, NGC3783, and possibly NGC6814. Various correlations between optical and X-ray properties are discussed. Using the typical Seyfert 1 spectrum their contribution to the diffuse X-ray background above five keV is computed.

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