Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..144m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 1, p. 144-153.
Astronomy and Astrophysics
Astrophysics
33
Accretion Disks, Active Galactic Nuclei, Markarian Galaxies, Seyfert Galaxies, X Ray Spectra, Bremsstrahlung, Electron Scattering, Rosat Mission
Scientific paper
The paper presents soft X-ray spectra of three Seyfert 2 galaxies obtained with the ROSAT PSPC. For two of these objects, NGC 5506 and MCG -5-23-16, most of the flux occurs at energies greater than 1 keV and probably represents a low-energy extension of the source seen at higher (greater than 2 keV) energies. The third source, Mrk 348, has very little flux in the ROSAT band, suggesting a photoelectric cutoff at energies above the ROSAT band, in agreement with Ginga observations. In all three galaxies, X-rays are detected at energies below these photoelectric cutoffs with flux above that expected from a model in which the source has the same spectral index as at higher energies (2-10 keV) and is covered by a uniform, cold, photoelectric absorber. This result indicates the presence of an additional component at soft energies, which is referred to as a 'soft excess'. The monochromatic flux of the soft excess measured at 1 keV is about 1-2 percent of the directly viewed hard X-ray continuum in all three galaxies.
Colbert Edward
Mulchaey John S.
Mushotzky Richard F.
Weaver Kimberley A.
Wilson Andrew S.
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