2011A&A...532A..84S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:56:04

2011A&A...532A..84S - Astronomy and Astrophysics, volume 532A, 84-84 (2011/8-1)

X-ray spectral properties of Seyfert galaxies and the unification scheme.

SINGH V., SHASTRI P. and RISALITI G.

Abstract (from CDS):

The unification scheme of Seyfert galaxies predicts that the observed differences between types 1 and 2 Seyfert galaxies are solely due to the differing orientations of the toroidal-shaped obscuring material around AGN. The observed X-ray spectra of Seyfert type 2s compared to type 1s are expected to be affected by higher absorbing column density owing to the edge-on view of the obscuring torus. We study the 0.5-10keV X-ray spectral properties of Seyfert type 1s and type 2s with the aim of testing the predictions of Seyfert unification scheme in the X-ray regime. We use an optically selected Seyfert sample in which type 1s and type 2s have matched distributions in parameters that are independent of the orientation of AGN and the host galaxy. The 0.5-10keV XMM-Newton pn X-ray spectra of Seyfert galaxies are in general best fitted with a model that consists of (i) an absorbed powerlaw; (ii) a narrow Gaussian fitted to the Fe Kα emission line; and (iii) an often seen soft-excess component characterized by either a thermal plasma model with temperature kT∼0.1-1.0keV or a steep powerlaw or both. The 2.0-10keV hard X-ray continuum emission in several Seyfert type 2s is dominated by reflection and suggests the Compton-thick obscuration.
Result. of the statistical comparison between the distributions of (i) the observed X-ray luminosities in the soft (0.5-2.0keV) and hard (2.0-10.0keV) bands; (ii) the X-ray absorbing column densities; (iii) the equivalent widths of Fe Kα line; and (iv) the flux ratios of hard X-ray to [OIII] λ5007Å, for the two Seyfert subtypes are consistent with the obscuration and orientation-based unification scheme.

Abstract Copyright:

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

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 262 Sy2 00 48 47.1414900 +31 57 25.083955 14.04 13.90 13.06 8.53   ~ 673 3
2 NGC 449 Sy2 01 16 07.2096682810 +33 05 21.651153340   15.90 14.96     ~ 268 4
3 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4093 2
4 UGC 3374 Sy1 05 54 53.6085733702 +46 26 21.625853190   15.37 14.62     ~ 466 2
5 Mrk 3 Sy2 06 15 36.458 +71 02 15.24 14.21 14.03 12.97     ~ 843 3
6 NGC 2273 Sy2 06 50 08.6724567505 +60 50 44.879789544   14.50 13.54     ~ 459 3
7 Mrk 78 Sy2 07 42 41.7030525112 +65 10 37.433697338   15.57 14.58     ~ 330 2
8 NGC 2622 Sy1 08 38 10.9363065349 +24 53 43.041208759   15.01 14.12     ~ 131 0
9 NGC 2639 Sy1 08 43 38.093 +50 12 19.94 12.90 12.56 11.65     ~ 383 2
10 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 786 3
11 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3380 2
12 NGC 4253 Sy1 12 18 26.5155239433 +29 48 46.518670434   14.34 13.57     ~ 931 1
13 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1781 3
14 NGC 5135 Sy2 13 25 44.059 -29 50 01.24   12.58 13.35 11.53 12.2 ~ 425 1
15 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1008 2
16 Mrk 477 Sy2 14 40 38.098 +53 30 16.24   16.05 15.03     ~ 282 1
17 NGC 5929 GiP 15 26 06.158 +41 40 14.40   13.0 14.00     ~ 414 0
18 NGC 5930 GiP 15 26 07.9964334517 +41 40 33.691556640   13.0       ~ 412 0
19 NGC 7212 Sy2 22 07 01.9866638486 +10 14 00.849716443   15.1       ~ 160 1
20 UGC 12163 Sy1 22 42 39.3364258078 +29 43 31.301194419   14.86 14.16     ~ 616 1
21 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1888 3
22 Mrk 926 Sy1 23 04 43.4773393553 -08 41 08.632325890   16.20 15.91 9.4   ~ 400 0
23 NGC 7603 Sy1 23 18 56.6537061537 +00 14 37.974617713   14.73 14.01     ~ 356 0
24 NGC 7674 Sy2 23 27 56.6974755223 +08 46 44.238278540 13.84 13.92 13.23 12.64   ~ 637 4
25 NGC 7682 Sy2 23 29 03.896 +03 32 00.00   14.3       ~ 204 0

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2020.07.13-07:56:04

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