2005A&A...433..841M


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.09CEST11:44:39

2005A&A...433..841M - Astronomy and Astrophysics, volume 433, 841-854 (2005/4-3)

Probing the nuclear obscuration in radio-galaxies with near infrared imaging.

MARCHESINI D., CAPETTI A. and CELOTTI A.

Abstract (from CDS):

We present the first near-infrared (K'-band) homogeneous observations of a complete sub-sample of the 3CR radio catalogue comprising all High Excitation Galaxies (HEGs) at z<0.3. After showing that the surface brightness decomposition technique to measure central point-like sources is affected by significant uncertainties for the objects in the studied sample, we present a new, more accurate method based on the R-K' color profile. Via this method we find a substantial nuclear K'-band excess in all but two HEGs - most likely directly associated with their nuclear emission - and we measure the corresponding 2.12µm nuclear luminosities. Within the frame-work of the unification scheme for radio-loud active galactic nuclei, it appears that obscuration alone is not able to account for the different nuclear properties of the majority of the HEGs and Broad Line Radio Galaxies (BLRGs), and also scattering of the (optically) hidden nuclear light from a compact region must be invoked. More precisely, for ∼70% of the HEGs the observed point-like optical emission is dominated by the scattered component, while in the K'-band both scattered and direct light passing through the torus contribute to the observed nuclear luminosity. The estimated fraction of scattered light ranges from a few tenths to a few percent, while the torus extinction is between 15<AV, torus_<50mag with only a few exceptions with lower obscuration.

Abstract Copyright:

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

Simbad objects: 33

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Number of rows : 33

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 18.0 Sy2 00 40 50.538407 +10 03 26.62330   18.5       ~ 146 2
2 2C 94 Sy2 01 08 52.8701245540 +13 20 14.257796477   15.19       ~ 448 2
3 3C 63 BLL 02 20 54.3164759040 -01 56 50.432576748           ~ 140 0
4 3C 79.0 Sy2 03 10 00.096140 +17 05 58.61497   19.54 18.75     ~ 245 3
5 2C 349 Sy2 03 58 54.4385123848 +10 26 02.820631972   16.68 15.41     ~ 325 2
6 2MASX J04071644+0342262 Sy2 04 07 16.440 +03 42 26.23   18.5       ~ 205 1
7 ICRF J041340.3+111214 Sy1 04 13 40.3410078 +11 12 14.785960   18.96 18.01     ~ 301 2
8 2MASX J05140834+0056316 Sy2 05 14 08.3682154567 +00 56 32.515822859   18.24 17.00     ~ 132 2
9 2C 524 Sy2 06 09 32.701768 +48 04 17.04207   21.198 18.00 18.767   ~ 172 1
10 3C 171.0 Sy2 06 55 14.7 +54 08 59   19.94 19.08     ~ 242 0
11 7C 073432.79+803253.00 Sy1 07 43 01.4 +80 26 26     17.0     ~ 172 1
12 2XMM J080535.0+240951 Sy2 08 05 35.0057673498 +24 09 50.334614040   15.46       ~ 317 1
13 3C 197.1 BLL 08 21 33.6009413715 +47 02 37.299966417   18.08 17.33     ~ 133 1
14 3C 198.0 AGN 08 22 31.9519395844 +05 57 06.774647022   18.04 17.33     ~ 122 0
15 7C 093653.10+360601.00 Sy2 09 39 52.7593482853 +35 53 58.921088539   19.51 18.60     ~ 258 1
16 7C 093818.10+395820.00 Sy2 09 41 24.0272828657 +39 44 41.806341013   16.36 16.4     ~ 180 2
17 7C 095855.89+290131.00 Sy1 10 01 49.5226070599 +28 47 08.913353395   18.21 17.27     ~ 404 1
18 2MASX J13110466+2728070 Sy2 13 11 04.670 +27 28 07.24   18.93 18.00     ~ 190 1
19 2MASX J13211781+4235153 Sy2 13 21 17.813 +42 35 15.38   16.86 16.23     ~ 258 0
20 3C 300 AGN 14 22 59.9 +19 35 37   19.66 18.73     ~ 186 2
21 3C 321 Sy2 15 31 43.473 +24 04 18.93   16.0   15.40   ~ 311 1
22 3C 327 Sy2 16 02 27.4 +01 57 56   17.70 16.31     ~ 231 0
23 3C 349 rG 16 59 32.00 +47 02 16.0   19 19.0     ~ 149 1
24 4C 31.47 rG 17 28 20.134 +31 46 03.01   15.5       ~ 125 1
25 3C 379.1 QSO 18 24 33.061 +74 20 58.57   18.0 18.0     ~ 84 1
26 2MASX J18334627+4727027 Sy1 18 33 46.2946109378 +47 27 02.568353862   18.64 17.24     ~ 195 1
27 MCG+08-36-003 LSB 19 41 45.9837632964 +50 35 45.373035919   14.9 14.0     ~ 105 1
28 3C 403.0 Sy2 19 52 15.7997953344 +02 30 24.235518851   15.42 16.5     ~ 301 1
29 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2165 2
30 3C 436 AGN 21 44 11.720 +28 10 18.86   18.5       ~ 176 1
31 3C 452 Sy2 22 45 48.787 +39 41 15.36   17.60 16.56     ~ 345 1
32 3C 456 AGN 23 12 28.0711694296 +09 19 26.469101543   18.54       ~ 105 2
33 3C 460 AGN 23 21 28.4 +23 46 48   20.315   18.468   ~ 87 2

    Equat.    Gal    SGal    Ecl

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2021.05.09-11:44:39

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