Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..491o&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 491 - 492
Astronomy and Astrophysics
Astrophysics
18
Seyfert Galaxies: X Rays, Seyfert Galaxies: Kerr Black Holes
Scientific paper
The authors present the results of a two-days observation of the narrow line Seyfert-1 galaxy IRAS 13224-3809 (z = 0.0667) with ASCA. During the observation, it showed a large variability with an amplitude of more than a factor ≡50. The shortest doubling time scale was 400 s. The central black hole may be a Kerr hole if the gravitational energy was spontaneously converted to radiation energy and/or if the X-ray radiation was not beamed to the line-of-sight. The mean energy spectrum in 0.4-10 keV was expressed by an extremely strong soft component (Γ ≡ 4) with a weak hard tail (Γ ≡ 1.5). The soft component dominated the spectrum below 1 keV and the hard one did above 2 keV. The soft component was well expressed by a blackbody model with temperature of kT ≅ 140 eV, but an absorption edge or a cut-off was present around 1 keV. Both soft and hard components varied almost simultaneously. This shows that the emission regions of both components are as close as their sizes and their emission mechanisms are closely related to each other.
Kii Tsuneo
Miya K.
Otani Chico
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