HEAO 1 observations of high-energy X-rays from the Seyfert 1 galaxy MKN 509.
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1981
- DOI:
- 10.1086/159397
- Bibcode:
- 1981ApJ...250..513D
- Keywords:
-
- Astronomical Spectroscopy;
- Heao 1;
- Seyfert Galaxies;
- X Ray Sources;
- Emission Spectra;
- Photons;
- Power Spectra;
- Astrophysics