Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.351..214h&link_type=abstract
Nature (ISSN 0028-0836), vol. 351, May 16, 1991, p. 214, 215.
Astronomy and Astrophysics
Astronomy
9
Galactic Radiation, High Temperature Gases, Iron, Metallicity, Seyfert Galaxies, X Rays, Astronomical Models, Continuous Radiation, Emission Spectra, Line Spectra
Scientific paper
Kunieda et al. (1990) observed rapidly varying X-ray continuum emission, along with an emission line at 6.4 keV, from the rapidly varying Seyfert galaxy NGC6814. They suggested that a central energy source of radius about 10 to the 12th cm generates X-rays that produce the emission line by fluorescence of iron in a surrounding cold gas extending out to about 10 to the 13th cm. However, the intense X-irradiation needed to explain the line intensity would heat the surrounding gas to too high a temperature to allow the existence of the low ionization state needed to account for the wavelength of the line. It is argued here that the line is generated by hot gas close to the central energy source and that the observed wavelength corresponds to the energy of a higher ionization state of iron, gravitationally redshifted by about 6 percent.
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