2004A&A...428..401V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:37:07

2004A&A...428..401V - Astronomy and Astrophysics, volume 428, 401-408 (2004/12-3)

The nuclear radio-optical properties of intermediate-redshift. FR II radio galaxies and quasars.

VARANO S., CHIABERGE M., MACCHETTO F.D. and CAPETTI A.

Abstract (from CDS):

We extend the study of the nuclei of 3CR objects as seen with the HST to higher-redshift FR II radio sources (0.4<z<0.6). Our results reflect what has been found for FR II of lower redshift. The position of the nuclei in the plane formed by optical and radio luminosities is related to their optical spectral classification: the nuclei of both high and low excitation galaxies lie on the correlation found for FR I sources, while broad-line objects have a significant optical excess. The nuclear properties of these sources are better understood when we consider the equivalent widths of the [OIII] emission line with respect to their optical luminosities. Even in the range of redshift considered here, low excitation galaxies show peculiar nuclear properties, more similar to those observed in FR I. This confirms that not all narrow-line FR II are unified with quasars. Our findings have important implications for the FR II-quasar unification scheme: by reconsidering the classification of all 3CR radio galaxies with z<1 in the light of their nuclear properties, we derive the opening angle of the obscuring torus for different redshift bins. We find that the covering factor of the obscuring structure decreases as the redshift increases (θ∼44° for z<0.3 to θ∼56° for 0.5<z<1). We argue that this behavior may be interpreted in the framework of the receding torus model, in which the opening angle of the torus increases as the luminosity of the accretion disk around the central black hole increases.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: nuclei - quasars: general

Simbad objects: 31

goto Full paper

goto View the reference in ADS

Number of rows : 31

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 3C 16 rG 00 37 44.50 +13 19 55.0   21       ~ 116 3
2 4C 32.03 rG 00 40 55.0 +33 10 07   20       ~ 135 1
3 3C 46 rG 01 35 25.3 +37 53 52   19.5       ~ 129 2
4 2E 437 Sy1 01 36 24.4206016519 +20 57 27.523115842   18.15 18.10     ~ 345 2
5 3C 99.0 Sy2 04 01 07.6 +00 36 33   20.200 19.010 18.532   ~ 104 1
6 2C 396 QSO 04 32 36.50262850 +41 38 28.4488035     20.0     ~ 204 1
7 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1266 1
8 3C 154.0 QSO 06 13 50.13917401 +26 04 36.7198424           ~ 147 0
9 3C 172 rG 07 02 08.31 +25 13 53.5   20.5       ~ 114 0
10 7C 073432.79+803253.00 Sy1 07 43 01.4 +80 26 26     17.0     ~ 170 1
11 3C 200 rG 08 27 25.4 +29 18 45   20       ~ 164 1
12 LB 9308 Sy1 09 06 31.8733814507 +16 46 11.791988809   18.48 18.27     ~ 282 3
13 3C 225 rG 09 42 15.4 +13 45 51   19 20.0     ~ 116 2
14 3C 228 rG 09 50 10.7 +14 19 58   21       ~ 157 2
15 3C 244.1 QSO 10 33 33.982 +58 14 35.85   19.0 19.0     ~ 174 1
16 3C 274.1 rG 12 35 31.00 +21 20 51.3   20       ~ 135 1
17 3C 275 rG 12 42 19.6 -04 46 20   21       ~ 112 1
18 3C 275.1 QSO 12 43 57.6490661384 +16 22 53.396063536   19.23 19.00     ~ 282 1
19 3C 295 Sy2 14 11 20.467 +52 12 09.52   22.34 20.80 18.54   ~ 896 5
20 3C 306.1 rG 14 55 01.4 -04 20 23   19       ~ 64 1
21 3C 313 rG 15 10 57.0 +07 51 25   21.0       ~ 98 1
22 3C 327.1 Sy1 16 04 45.4065607141 +01 17 50.317968747   20.5       ~ 121 1
23 NAME 3C 330G2 Sy2 16 09 35.0 +65 56 39   20.33       ~ 253 1
24 2E 3648 Sy1 16 20 21.8184966430 +17 36 23.952696503   16.53 16.41 20.5   ~ 388 2
25 3C 341 rG 16 28 03.50 +27 41 36.1   19       ~ 133 1
26 3C 345 QSO 16 42 58.8100340220 +39 48 36.999540578   16.81 16.59 16.84   ~ 1554 2
27 2E 4367 Sy1 20 22 08.4405149995 +10 01 11.309490249   19.70 19.4     ~ 103 1
28 3C 427.1 rG 21 04 07.3 +76 33 08   23.3 21.1     ~ 145 1
29 VSOP J2129+0733 rG 21 29 05.37 +07 32 58.6   21       ~ 26 1
30 3C 435 G 21 29 06.10 +07 32 58.0   21       ~ 63 2
31 3C 455.0 Sy2 22 55 03.9 +13 13 35   19.535 19.590 19.190   ~ 187 2

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2004A&A...428..401V and select 'bookmark this link' or equivalent in the popup menu


2020.07.13-23:37:08

© Université de Strasbourg/CNRS

    • Contact