X-ray continuum and line emission of the Seyfert galaxy MCG - 5-23-16

Details X-ray continuum and line emission of the Seyfert galaxy MCG - 5-23-16 X-ray continuum and line emission of the Seyfert galaxy MCG - 5-23-16

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385..132s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 132-136.

Astronomy and Astrophysics

Astrophysics

8

Active Galactic Nuclei, Continuous Radiation, Emission Spectra, Line Spectra, Seyfert Galaxies, X Ray Sources, Exosat Satellite, Line Of Sight, Luminous Intensity, Radiant Flux Density, Radiation Detectors, Spectrum Analysis, X Ray Spectra

Scientific paper

The low-energy and the medium-energy detectors of the Exosat Observatory are used to report observations of X-ray continuum and line emission from the highly absorbed and variable Seyfert galaxy MCG - 5-23-16 performed between December 1983 and May 1984. The X-ray intensity of the source is observed to vary by about 25 percent in the hard (2-10 keV) and by about 40 percent in the soft (0.1-2.0 keV) energy bands over a period of 6 months. The 0.1-10 keV X-ray spectrum is adequately explained by a simple power law. The measured energy index lies in the range 0.42-0.89 and shows a dependence on the intensity. Line emission at 6.4 keV is detected in the 1984 observations when the X-ray spectrum is relatively harder. The equivalent width of the line is measured to be 346 +/-146 eV. The presence of line emission is also indicated in the 1983 data. The line-of-sight absorption is much higher than the 21-cm value, suggesting a very high obscuration of the nuclear source. It is suggested that as the absorption of the direct component increases with time, so does the amount of the reflected component, thus hardening the spectrum and also producing more line emission.

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