2003A&A...398..927W


Query : 2003A&A...398..927W

2003A&A...398..927W - Astronomy and Astrophysics, volume 398, 927-936 (2003/2-2)

Extreme slim accretion disks and narrow line Seyfert 1 galaxies: The nature of the soft X-ray hump.

WANG J.-M. and NETZER H.

Abstract (from CDS):

We present a detailed model of an extreme slim disk (ESD) with a hot corona around a massive black hole with dimensionless accretion rate {dot}(m) in the range 2.5≪{dot}(m)≤100. We assume that a fraction f of the gravitational energy is released in the hot corona and the rest is released in the ESD. The energy equation of the ESD is dominated by advection and the spectrum shows a broad ``hump'' caused by saturated Comptonization with monochromatic luminosity given by νLν∝ν0. This relationship enables us to estimate the black hole mass from the ESD luminosity. The spectrum of the hot corona is sensitive to the parameter f{dot}(M) and the viscosity and shows a Comptonized power-law with a high-energy cutoff. The model is used to explain the spectral properties of narrow line Seyfert 1 galaxies (NLS1s). In particular, it can explain the spectrum of extreme NLS1s like NLS1 RE J1034+396. Our spectral estimate of the black hole mass in this source is in good agreement with the mass obtained by applying the reververation mapping correlation. We also examine the Eddington ratios in a large NLS1 sample and find that most objects show super-Eddington accretion rates. We argue that soft X-ray humps in NLS1s are natural consequences of super-Eddington accretion in such objects.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - galaxies: active - galaxies: Seyfert - X-rays: galaxies

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Ton S 180 Sy1 00 57 20.2040816832 -22 22 56.575212564   14.60 14.34 15.23   ~ 283 0
2 QSO B0558-5026 BLL 05 59 47.3916612936 -50 26 52.025952120   15.18 14.97     ~ 265 1
3 LEDA 88588 Sy1 07 08 41.4886614696 -49 33 06.308921700   16.02 15.7 12.7   ~ 466 0
4 Z 212-25 Sy1 10 34 38.5982990352 +39 38 28.187042604   17.37 16.90     ~ 332 1
5 PB 3894 Sy1 12 14 17.6738687784 +14 03 13.182723144   14.46 14.19     ~ 777 0
6 NGC 4253 Sy1 12 18 26.5163572920 +29 48 46.531535472   14.34 13.57     ~ 986 1
7 LBQS 1244+0238 Sy1 12 46 35.2527826632 +02 22 08.782546368   16.57 16.37     ~ 272 0
8 LEDA 88835 Sy1 13 25 19.3805530608 -38 24 52.611680340   16.64 13.80 15.33   ~ 382 0
9 LEDA 50313 Sy1 14 06 21.8900886888 +22 23 46.515550056   16.62 16.42     ~ 217 0
10 Mrk 478 Sy1 14 42 07.4714418744 +35 26 22.938625500   14.91 14.58     ~ 511 0
11 2MASS J17023106+3247196 Sy1 17 02 31.0621362912 +32 47 19.645937088   16.19 15.98     ~ 66 0
12 UGC 12163 Sy1 22 42 39.3363009144 +29 43 31.302092640   14.86 14.16     ~ 662 1

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2022.08.15-14:13:04

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