2010A&A...511A..64V


Query : 2010A&A...511A..64V

2010A&A...511A..64V - Astronomy and Astrophysics, volume 511, A64-64 (2010/2-2)

Dust tori in radio galaxies.

VAN DER WOLK G., BARTHEL P.D., PELETIER R.F. and PEL J.W.

Abstract (from CDS):

We investigate the quasar - radio galaxy unification scenario and detect dust tori within radio galaxies of various types. Using VISIR on the VLT, we acquired sub-arcsecond (∼0.40") resolution N-band images, at a wavelength of 11.85 µm, of the nuclei of a sample of 27 radio galaxies of four types in the redshift range z=0.006-0.156. The sample consists of 8 edge-darkened, low-power Fanaroff-Riley class I (FR-I) radio galaxies, 6 edge-brightened, class II (FR-II) radio galaxies displaying low-excitation optical emission, 7 FR-IIs displaying high-excitation optical emission, and 6 FR-II broad emission line radio galaxies. Out of the sample of 27 objects, 10 nuclei are detected and several have constraining non-detections at sensitivities of 7mJy, the limiting flux a point source has when detected with a signal-to-noise ratio of 10 in one hour of source integration. On the basis of the core spectral energy distributions of this sample we find clear indications that many FR-I and several low-excitation FR-II radio galaxies do not contain warm dust tori. At least 57±19 percent of the high-excitation FR-IIs and almost all of the broad line radio galaxies exhibit excess infrared emission, which must be attributed to warm dust reradiating accretion activity. The FR-I and low-excitation FR-II galaxies are all of low efficiency, which is calculated as the ratio of bolometric to Eddington luminosity Lbol/LEdd<10–3. This suggests that thick tori are absent at low accretion rates and/or low efficiencies. The high-excitation FR-II galaxies are a mixed population with three types of nuclei: 1) low efficiency with dust torus; 2) low efficiency with weakly emitting dust torus; and 3) high efficiency with weak dust torus. We argue that the unification viewing angle range 0-45 degrees of quasars should be increased to ∼60 degrees, at least at lower luminosities.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: jets - galaxies: nuclei - infrared: galaxies - radiation mechanisms: non-thermal - radiation mechanisms: thermal

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 4C 12.03 rG 00 09 52.6114659912 +12 44 04.661082672   17.8       ~ 76 1
2 3C 15 BiC 00 37 04.1107321824 -01 09 08.407668996   15.34       ~ 222 1
3 UGC 595 AGN 00 57 34.90446247 -01 23 27.5469897   14.07 15.10     ~ 251 1
4 NGC 547 AGN 01 26 00.6208982520 -01 20 42.432452268   13.16 13.34     ~ 341 3
5 NGC 1218 Sy1 03 08 26.22380005 +04 06 39.3007808   12.84       ~ 376 1
6 NGC 1316 GiP 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1366 1
7 3C 93.0 BLL 03 43 29.9963486496 +04 57 48.612170988   18.49 18.14     ~ 152 1
8 2C 349 Sy2 03 58 54.4370049840 +10 26 02.791855968   16.68 15.41     ~ 339 2
9 3C 105.0 Sy2 04 07 16.4671273272 +03 42 25.813809432   18.5       ~ 224 1
10 Mrk 1506 Sy1 04 33 11.0956735296 +05 21 15.619461552   15.72 15.05 10.08   ~ 1986 2
11 2MASX J05140834+0056316 Sy2 05 14 08.3684211120 +00 56 32.518880340   18.24 17.00     ~ 136 2
12 NAME Pic A Sy1 05 19 49.7229323856 -45 46 43.852662732   15.73 15.77 14.85   ~ 648 1
13 3C 198.0 AGN 08 22 31.9510001544 +05 57 06.787089972   18.04 17.33     ~ 129 0
14 ATO J146.9381+07.4223 Sy1 09 47 45.1433922288 +07 25 20.595729756   17.37 16.95     ~ 369 0
15 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1212 0
16 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7067 3
17 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4420 3
18 ICRF J141949.7-192825 Sy1 14 19 49.7385955512 -19 28 25.268834424   17.60 16.66 13.9   ~ 104 1
19 UGC 9799 Sy2 15 16 44.4893939136 +07 01 17.825410740   15.19 14.17     ~ 443 3
20 3C 327 Sy2 16 02 27.4 +01 57 56   17.70 16.31     ~ 238 0
21 2C 1473 AGN 17 20 28.1680537512 -00 58 46.582453920   15.36       ~ 321 1
22 LEDA 140826 G 18 43 14.61807 -48 36 23.1997   16.79 17.5 15.25   ~ 57 1
23 3C 403.0 Sy2 19 52 15.7996999344 +02 30 24.238200816   15.42 16.5     ~ 331 1
24 3C 403.1 G 19 52 35.0 -01 17 58     17.5     ~ 52 0
25 3C 424 BLL 20 48 12.030 +07 01 17.48   18 18.40     ~ 140 1
26 MCG-06-48-013 Sy2 22 01 17.0669321040 -37 46 23.886792120   14.90 14.03     ~ 84 3
27 LEDA 68751 Sy1 22 23 49.5400938871 -02 06 12.859452336   16.93 15.77 16.02   ~ 478 2
28 ESO 349-10 QSO 23 57 00.7406438328 -34 45 32.994968292   13.89 13.26 12.19   ~ 127 2

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2023.11.28-23:45:41

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