2009A&A...501..933L


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.04CET17:42:51

2009A&A...501..933L - Astronomy and Astrophysics, volume 501, 933-940 (2009/7-3)

The parsec-scale properties of the radio galaxy 4C 26.42 in the dense cooling core cluster A1795.

LIUZZO E., TAYLOR G.B., GIOVANNINI G. and GIROLETTI M.

Abstract (from CDS):

The aim of the present work is to study the radio emission on the parsec scale of 4C 26.42, the Brightest cluster galaxy in Abell 1795, in the framework of radiosources in a dense cool core cluster. We present Very Long Baseline Array (VLBA) observations at 1.6, 5, 8.4 and 22GHz. We performed a spectral index and multiepoch analysis. The source appears two-sided with a well defined and symmetric Z-structure at ∼5mas from the core. The kiloparsec-scale morphology is similar to the parsec-scale structure, but reversed in PA, with symmetric 90° bends at about 2 arcsec from the nuclear region. Comparing data obtained at 3 different epochs we derive a 3σ limit to the apparent proper motion of βa<0.04. We suggest that the parsec-scale jets are sub-relativistic, in contrast with the high velocities found for most low-power radio galaxies. The origin of the unusual radio morphology remains a puzzle. We suggest that the identification of the parent galaxy with the central cD in a cooling cluster plays an important role in the properties and structure of the jets.

Abstract Copyright:

Journal keyword(s): cooling flows - galaxies: clusters: individual: Abell 1795 - Galaxy: structure - radio continuum: galaxies - galaxies: nuclei

Nomenclature: Figs 1-3: [LTG2009] AN (Nos A-C, A1-A2), [LTG2009] WN (Nos N1, S1).

Simbad objects: 15

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Number of rows : 15

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 87GB 005314.6+260945 BiC 00 55 50.583 +26 24 36.68   18.63   16.26   ~ 198 1
2 ACO 115 ClG 00 55 59.5 +26 19 14           ~ 239 1
3 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3621 3
4 NAME Hya A LIN 09 18 05.651 -12 05 43.99   14.38 14.8     ~ 919 1
5 NGC 4696 BiC 12 48 49.277 -41 18 39.92   11.21   10.7   ~ 459 3
6 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 992 2
7 7C 1339+2724 QSO 13 42 08.3765700209 +27 09 30.614948711   19.0 19.0 16.84   ~ 58 1
8 MCG+05-33-005 LIN 13 48 52.511 +26 35 34.84   14.0       ~ 222 2
9 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1178 0
10 7C 134837.00+304924.00 QSO 13 50 52.73621029 +30 34 53.5904749   18.73 18.34 18.80   ~ 96 1
11 3C 293.0 BLL 13 52 17.880 +31 26 46.49   16.10 15.10     ~ 430 3
12 ACO 2390 ClG 21 53 34.6 +17 40 11           ~ 632 2
13 NAME SMM J21536+1741 BiC 21 53 36.82670 +17 41 43.7260     19.58     ~ 40 2
14 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 502 0
15 2E 4728 LIN 23 25 19.731 -12 07 27.51   15.45 15.46     ~ 169 2

    Equat.    Gal    SGal    Ecl

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2021.03.04-17:42:51

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