X-ray evidence for Seyfert activity buried in the infrared galaxy NGC 4945

Details X-ray evidence for Seyfert activity buried in the infrared galaxy NGC 4945 X-ray evidence for Seyfert activity buried in the infrared galaxy NGC 4945

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..155i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 1, p. 155-161.

Astronomy and Astrophysics

Astronomy

105

Active Galactic Nuclei, Active Galaxies, Infrared Sources (Astronomy), Seyfert Galaxies, X Ray Astronomy, X Ray Spectra, Ginga Satellite, H Alpha Line, Power Spectra, Spiral Galaxies

Scientific paper

The X-ray spectrum of NGC 4945 encompasses three components: (1) hard X-ray emission which is heavily absorbed by cold material; (2) soft X-ray emission; and (3) an Fe emission line. While the hard emission component exhibits a power-law spectrum whose intensity variations may indicate the presence of an AGN in the galaxy, the soft emission component may be fitted with a power-law model having nearly the same photon index as the hard component but exhibits merely 3 percent of its luminosity and shows no time variability. NGC 4945 is the first active galaxy with both the obscuring and scattering characteristics of the type 2 AGNs.

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