2005A&A...436..817A


Query : 2005A&A...436..817A

2005A&A...436..817A - Astronomy and Astrophysics, volume 436, 817-824 (2005/6-4)

Direct evidence of the receding ``torus'' around central nuclei of powerful radio sources.

ARSHAKIAN T.G.

Abstract (from CDS):

The presence of obscuring material (or a dusty ``torus'') in active galactic nuclei (AGN) is central to the unification model for AGN. Two models, the multi-population model for radio sources and the receding torus model, are capable of describing observational properties of powerful radio galaxies and radio quasars. Here, I study the changes of the opening angle of the obscuring torus with radio luminosity at 151MHz, [O III] emission-line luminosity and cosmic epoch aiming to discriminate between two working models. An analytical expression relating the half opening angle of the torus to the mean projected linear sizes of double radio galaxies and quasars is derived. The sizes of powerful double radio sources taken from the combined sample of 3CRR, 6CE and 7CR complete samples are used to estimate the torus opening angle. I found a statistically significant correlation between the half opening angle of the torus and [O III] emission-line luminosity. The opening angle increases from 20° to 60° with increasing [O III] emission-line luminosity. This correlation is interpreted as direct evidence of the receding torus around central engines of powerful double radio sources.

Abstract Copyright:

Journal keyword(s): galaxies: active - radio continuum: galaxies - methods: analytical

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 - 2021
#notes
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2605 2
2 ICRF J041340.3+111214 Sy1 04 13 40.3410078 +11 12 14.785960   18.96 18.01     ~ 301 2
3 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5469 6
4 3C 265.0 Sy1 11 45 29.0 +31 33 50   20.0       ~ 238 0
5 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3461 2
6 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1144 0
7 3C 287 QSO 13 30 37.6950709913 +25 09 10.983254741   18.31 17.67     ~ 333 1
8 3C 295 Sy2 14 11 20.467 +52 12 09.52   22.34 20.80 18.54   ~ 919 5
9 3C 343 Sy2 16 34 33.8067419 +62 45 35.895020   21.06 20.61     ~ 209 1
10 3C 345 QSO 16 42 58.8100340220 +39 48 36.999540578   16.81 16.59 16.84   ~ 1588 2
11 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2176 2
12 3C 454.3 Bla 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2592 2

    Equat.    Gal    SGal    Ecl

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2021.07.24-09:56:14

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