2008A&A...492...93B


Query : 2008A&A...492...93B

2008A&A...492...93B - Astronomy and Astrophysics, volume 492, 93-99 (2008/12-2)

The efficient low-mass Seyfert MCG-05-23-016.

BECKMANN V., COURVOISIER T.J.-L., GEHRELS N., LUBINSKI P., MALZAC J., PETRUCCI P.-O., SHRADER C.R. and SOLDI S.

Abstract (from CDS):

The Seyfert 1.9 galaxy MCG-05-23-016 has been shown to exhibit a complex X-ray spectrum. This source has moderate X-ray luminosity, hosts a comparably low-mass black hole, but accretes at a high Eddington rate, and allows us to study a super massive black hole in an early stage. Three observations of the INTEGRAL satellite simultaneous with pointed Swift/XRT observations performed from December 2006 to June 2007 are used in combination with public data from the INTEGRAL archive to study the variability of the hard X-ray components and to generate a high-quality spectrum from 1 to 150keV. The AGN shows little variability in the hard X-ray spectrum, with some indication of a variation in the high-energy cut-off energy ranging from 50keV to ≫100keV, with an electron plasma temperature in the 10-90keV range. The reflection component is not evident and, if present, the reflected fraction can be constrained to R<0.3 for the combined data set. Comparison to previous observations shows that the reflection component has to be variable. No variability in the UV and optical range is observed on a time scale of 1.5 years. The hard X-ray spectrum of MCG-05-23-016 appears to be stable with the luminosity and underlying power law varying moderately and the optical/UV flux staying constant. The reflection component and the iron Kα line seem to have decreased between December 2005 and the observations presented here. The spectral energy distribution appears to be similar to that of Galactic black hole systems, e.g. XTE 1118+480 in the low state. The AGN exhibits a remarkably high Eddington ratio of Lbol/LEdd>0.8 (or Lbol/LEdd>0.1, if we consider a higher mass of the central engine) and, at the same time, a low cut-off energy around 70keV. Objects like MCG-05-23-016 might indicate the early stages of super massive black holes, in which a strong accretion flow feeds the central engine.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - X-rays: galaxies - galaxies: individual: MCG-05-23-016 - accretion, accretion disk

CDS comments: Paragraph 3.2 XTE J1550+564 is a misprint for XTE J1550-564.

Simbad objects: 9

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Number of rows : 9
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 NGC 1313 G 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 652 2
2 1RXS J092418.0-314212 X 09 24 01 -31 41.6           ~ 7 0
3 ESO 434-40 Sy2 09 47 40.1332188528 -30 56 55.960779696   14.10 13.69 12.44   ~ 515 0
4 V* KV UMa HXB 11 18 10.7930420496 +48 02 12.314730120     12.25     K5V-M1V 768 0
5 V* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000   17.95 16.6     K3III 1097 0
6 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1792 1
7 V* V821 Ara HXB 17 02 49.3876391280 -48 47 23.087954544 16.20 16.30 15.5     ~ 1931 0
8 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3928 3
9 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4119 0

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2022.08.08-04:16:34

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