Unified theories of active galactic nuclei - The hard X-ray spectrum of NGC 1068

Details Unified theories of active galactic nuclei - The hard X-ray spectrum of NGC 1068 Unified theories of active galactic nuclei - The hard X-ray spectrum of NGC 1068

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263...54s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 263, no. 1, p. 54-60.

Astronomy and Astrophysics

Astronomy

19

Active Galactic Nuclei, Emission Spectra, X Ray Astronomy, X Ray Spectra, Line Spectra, Seyfert Galaxies, Spaceborne Astronomy, Spectrum Analysis

Scientific paper

We have reanalyzed the Ginga observation of the archetypal Seyfert 2 galaxy NGC 1068. The X-ray spectrum can be decomposed into four components: a hard X-ray power law, iron K-alpha emission-line radiation, reflection from an accretion disc or molecular torus, and emission-line radiation at about 8 keV. Although reflection is not required, its inclusion is consistent with the data and increases the underlying intrinsic power-law energy index to alpha(E) about 0.9, similar to the typical slope found for Seyfert 1 galaxies. Reflection is unlikely to produce all the observed equivalent width of the Ginga Fe K-alpha emission line, but can account for all of the component seen at 6.4 keV by BBXRT. An additional line at about 8 keV is required at 95 per cent confidence, and may be identified with a blend of Fe K-beta and Ni K-alpha lines, or iron recombination radiation. The Ginga data suggest that less than 20 per cent of the 2-10 keV flux is thermal emission with kT = 2 keV or greater. This favors the proposal of Wilson et al. (1992) that the starburst disc spectrum is intrinsically soft, with kT about 1 keV, but with a large Fe L emission-line complex giving rise to the apparent hardening in the ROSAT HRI data. If this interpretation is correct then the ratio of equivalent widths of the Fe L and K lines is not a good diagnostic of the ionization state of the scattering region in NGC 1068.

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