Slim-Disk model for Soft X-Ray Excess and Variability of Narrow-Line Seyfert 1 Galaxies
By S. Mineshige, T. Kawaguchi, M. Takeuchi, K. J. D. O. Astronomy, Kyoto University Research Fellow of the Japan Society fo Institute, Osaka-Kyoiku University Department of Earth, S. Sciences, Osaka University. 2000
207 citations recorded by the source corpus.
Narrow-line Seyfert 1 galaxies (NLSls) exhibit an extreme soft X-ray excess and large variability. We argue that both features can be basically accounted for by the slim-disk model. We assume that a central black-hole mass in NLS1 is relatively small, M ~ 105~7A^, and that a disk shines nearly at the Eddington luminosity, L^- Then, the disk becomes a slim disk and exhibits the following distinctive signatures: (1) The disk luminosity (particularly of X-rays) is insensitive to the mass-flow rates, M, since the generated energy is partly carried away to the black hole by trapped photons in accretion flow. (2) The spectra are multi-color blackbody. The maximum blackbody temperature is Ti,b — 0.2(M/10 5M®)~1 ^4 keV, and the size of the blackbody emitting region is small, rt>b % 3rg (with rs being Schwarzschild radius), even for a Schwarzschild black hole. (3) All of the ASCA observation data of NLSls fall onto the region of M/(LE/c2) > 10 (with LE being the Eddington luminosity) on the (rbt>,7bb) plane, supporting our view that a slim disk emits soft X-rays at ~ Lg in NLSls. (4) Magnetic energy can be amplified, at most, up to the equipartition value with the trapped radiation energy, which greatly exceeds the radiation energy emitted from the disk. Hence, energy release by consecutive magnetic reconnection will give rise to substantial variability in soft X-ray emission.
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Citations in the corpus
- Hot Accretion Flows Around Black Holes (2014, methodology): “The slim disk model has been applied to narrow-line Seyfert galaxies (Mineshige et al. 2000), objects like SS433 (Fabrika 2004) and ultraluminous X-ray sources (Watarai et al. 2001).”
- Radiative efficiency of hot accretion flows (2012, background): “Therefore, the radiative efficiency is lower (Abramowicz et al. 1988; Mineshige et al. 2000; Sadowski 2009).”
- Coronal outflow dominated accretion discs: a new possibility for low-luminosity black holes? (2001, background): “…RAS, MNRAS000, 000–000 e. g. Zdziarski 1999 and reference therein); powerful blazars (see in particular Ghisellini & Celotti 2001a, where it is shown how the relativistic jet in these sources may dominate the totalutput power); and possibly, narrow line Seyfert 1s (NLS1, Mineshige et al. 2000).”
- Slim-Disk Model for Ultraluminous X-Ray Sources (2000, background): “More recently, Watarai et al. (2000) and Mineshige et al. (2000) discussed the distinctive spectral features of the slim disks in connection with BHBs and narrow-line Seyfert 1 galaxies, respectively (see also Fukue 2000).”
- Supercritical Accretion Flows around Black Holes: Two-dimensional, Radiation Pressure-dominated Disks with Photon Trapping (2005, background): “…slim-disk model succeeds in reproducing the observed behavior of Ultra-luminous X-ray sources (ULXs) and narrow-line Seyfert 1 galaxies (NLS1s), which are thought to be candidates of near- or super-critical flows (Watarai, Mizuno, & Mineshige 2001; Mineshige et al. 2000; Kawaguchi 2003).”