Implication for Super-Critical Accretion Flow in the Narrow-Line Seyfert 1 Galaxy PKS 0558-504

Details Implication for Super-Critical Accretion Flow in the Narrow-Line Seyfert 1 Galaxy PKS 0558-504 Implication for Super-Critical Accretion Flow in the Narrow-Line Seyfert 1 Galaxy PKS 0558-504

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasj...60..487h&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.60, No.3, pp.487--491

Astronomy and Astrophysics

Astronomy

4

Accretion Disks, Galaxies: Active, Galaxies: Individual (Pks 0558-504), Galaxies: Seyfert, X-Rays: Galaxies

Scientific paper

We present results from XMM-Newton observations of the narrow-line Seyfert 1 galaxy PKS0558-504. The 2-12keV X-ray spectra can be well-reproduced by a single power law with a photon index of ˜2.2. The extrapolation of this power law continuum into the lower energy band reveals the existence of a strong soft excess component. When we applied a multicolor disk blackbody (MCD) model to the soft excess component, we found that the observed disk temperature, kTin, is much higher than that predicted from a standard Shakura-Sunyaev accretion disk. Furthermore, when the luminosity of the soft excess component, Ldisk, exceeds about 5×1044ergs-1, kTin seems to decrease in spite of the increase of luminosity. This trend is inconsistent with the standard accretion disk. Therefore, these results strongly suggest that the standard accretion-disk picture is no longer appropriate in the nucleus of PKS0558-504. From the estimated bolometric luminosity (˜1046ergs-1) and the central mass (5×107Modot) of the black hole, PKS0558-504 may be shining at the super-Eddington luminosity. We discuss a possible origin of the soft excess component, and suggest that significant photon trapping in the disk could explain the observational results.

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