2007A&A...470..531W


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST09:24:19

2007A&A...470..531W - Astronomy and Astrophysics, volume 470, 531-538 (2007/8-1)

The influence of AGN nuclear parameters on the FRI/FRII dichotomy.

WOLD M., LACY M. and ARMUS L.

Abstract (from CDS):

We have investigated the influence of nuclear parameters such as black hole mass and photoionizing luminosity on the FRI/FRII transition in a sample of nearby (z<0.2) radio galaxies from the 3CR catalogue. The sample was observed with medium-resolution, optical spectroscopy and contains some galaxies with unpublished velocity dispersion measurements and emission-line fluxes. The measured velocity dispersions for the sample lie in the range 130-340km/s with a mean of 216 km/s. Using the M-σ* relation, we convert to black hole mass and find that the black hole mass distribution is identical for FRI and FRII galaxies, with a mean of ≃2.5x108M. We determine narrow emission-line luminosities from [OII] and [OIII] in our spectra, as well as from the literature, and convert them to photoionizing luminosities under the assumption that the gas is ionized by the nuclear UV continuum. Most of the galaxies with FRI morphology and/or low-excitation emission-line spectra have progressively lower black hole masses at lower photoionizing (and jet) luminosities. This agrees with the well-known Ledlow-Owen relation which states that the radio luminosity at the FRI/FRII transition depends on the optical luminosity of the host, Lradio∝Loptical1.8, because these two luminosities relate to AGN nuclear parameters. When recasting the Ledlow-Owen relation into black hole mass versus photoionizing luminosity and jet luminosity, we find that the recasted relation describes the sample quite well. Furthermore, the FRI/FRII transition is seen to occur at approximately an order of magnitude lower luminosity relative to the Eddington luminosity than the soft-to-hard transition in X-ray binaries. This difference is also consistent with the Ledlow-Owen relation, which predicts a weak black hole mass dependence in the transition luminosity in Eddington units. We conclude that the FRI/FRII dichotomy is caused by a combination of external and nuclear factors, with the latter dominating.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: jets - X-rays: binaries

Simbad objects: 23

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Number of rows : 23

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 4C 12.03 rG 00 09 52.6115865762 +12 44 04.664804414   17.8       ~ 68 1
2 3C 20 Sy2 00 43 09.6 +52 03 35   19.0       ~ 200 0
3 87GB 005314.6+260945 BiC 00 55 50.583 +26 24 36.68   18.63   16.26   ~ 196 1
4 NGC 383 rG 01 07 24.95870 +32 24 45.2140   13.6 12.14     ~ 719 3
5 2C 94 Sy2 01 08 52.8701245540 +13 20 14.257796477   15.19       ~ 440 2
6 3C 35 QSO 01 12 02.216 +49 28 35.24     15.6     ~ 137 0
7 UGC 1841 Sy1 02 23 11.41124 +42 59 31.3840   15.71 14.81     ~ 527 2
8 3C 76.1 rG 03 03 15.012 +16 26 18.84   16.00 14.86     ~ 159 2
9 NGC 1265 GiC 03 18 15.674 +41 51 27.94   14.7       ~ 349 2
10 2C 349 Sy2 03 58 54.4385123848 +10 26 02.820631972   16.68 15.41     ~ 320 2
11 HD 28191 PM* 04 27 00.7096271169 +02 04 45.866430765   7.318 6.221     K0III 24 0
12 NGC 6109 LIN 16 17 40.591 +35 00 15.48   14.9       ~ 168 2
13 2MASX J18334627+4727027 Sy1 18 33 46.2946109378 +47 27 02.568353862   18.64 17.24     ~ 194 1
14 3C 386.0 rG 18 38 26.237 +17 11 49.75   15.85 14.6     ~ 184 2
15 3C 388.0 SyG 18 44 02.417 +45 33 29.81   16.91 15.56     ~ 300 1
16 3C 401 SyG 19 40 25.2 +60 41 34   19.1       ~ 193 1
17 HD 188121 PM* 19 52 33.2387860248 +28 32 22.426582892   9.06 8.43     G0IV 5 0
18 2MASX J21234458+2504272 Sy2 21 23 44.582 +25 04 27.23   17.660 16.350     ~ 300 0
19 NGC 7236 LIN 22 14 44.989 +13 50 47.43   14.3 14.3     ~ 255 2
20 UGC 12064 AGN 22 31 20.625 +39 21 29.81   14.6       ~ 417 1
21 3C 452 Sy2 22 45 48.787 +39 41 15.36   17.60 16.56     ~ 338 1
22 4C 11.71 QSO 22 49 54.58597467 +11 36 30.8467145   14.4       ~ 166 2
23 NGC 7720 Sy1 23 38 29.38322439 +27 01 53.2583763   13.9 13.3     ~ 511 4

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2020.07.05-09:24:19

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