HEAO 1 observations of high-energy X-rays from the Seyfert I galaxy MKN 509

Details HEAO 1 observations of high-energy X-rays from the Seyfert I galaxy MKN 509 HEAO 1 observations of high-energy X-rays from the Seyfert I galaxy MKN 509

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..513d&link_type=abstract

Astrophysical Journal, Part 1, vol. 250, Nov. 15, 1981, p. 513-516.

Astronomy and Astrophysics

Astrophysics

13

Astronomical Spectroscopy, Heao 1, Seyfert Galaxies, X Ray Sources, Emission Spectra, Photons, Power Spectra

Scientific paper

The results of observations of the Seyfert I galaxy Mkn 509 at high X-ray energies (14-140 keV) with the UCSD/MIT instrument aboard HEAO 1 are reported. The source is detected at energies above 40 keV, and the spectrum is consistent with an extrapolation of the power-law spectrum obtained at lower X-ray energies. Observations on four separate days in 1978 October indicate that the source is varying on a time scale of days.

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