2019A&A...631A.173B


Query : 2019A&A...631A.173B

2019A&A...631A.173B - Astronomy and Astrophysics, volume 631A, 173-173 (2019/11-1)

Multifrequency JVLA observations of the X-shaped radio galaxy in Abell 3670.

BRUNO L., GITTI M., ZANICHELLI A. and GREGORINI L.

Abstract (from CDS):


Context. X-shaped radio galaxies (XRGs) exhibit a pair of bright primary lobes and a pair of weak secondary lobes ("wings"), which are oriented with an angle that gives the structure a cross-like shape. Though several theoretical models have been proposed to explain their origin, there is currently not a general consensus on a formation scenario.
Aims. We analysed new multifrequency Karl G. Jansky Very Large Array (JVLA) radio data at 1.5, 5.5, 6, and 9GHz of the candidate XRG in Abell 3670 (A3670) in order to characterise and classify it for the first time and to investigate its origin.
Methods. We produced flux, spectral index, and radiative age maps of A3670 by means of the new radio data. We investigated the connection between the radio galaxy and its host, a brightest cluster galaxy (BCG) with two optical nuclei classified as a dumbbell galaxy. Finally we discussed the literature models and compared them to the observed properties of A3670.
Results. We classify A3670 as a Fanaroff-Riley I-type XRG and measured a 1.4GHz radio power of P1.4=1.7x1025W/Hz. By estimating the radiative age of the various source components, we find that the wings are Δt~=20Myr older than the lobes. We verified that the lobes and wings are aligned with the major and minor axes of the optical galaxy, respectively, and we estimated a black hole mass of MBH∼109M, which is in agreement with the typical properties of the XRGs.
Conclusions. Among the discussed scenarios, the jet-shell interaction model may best reproduce the observed properties of A3670. The gas of a stellar shell is responsible for the deflection of the jets, thus forming the wings. The presence of stellar shells in A3670 is plausible, but it needs further optical observations to be confirmed.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: active - galaxies: evolution - radio continuum: galaxies

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2675 2
2 NAME Centaurus A Sy2 13 25 27.6039817176 -43 01 09.493008456   8.18 6.84 6.66   ~ 4231 3
3 4C 00.58 rG 16 06 12.6837900528 +00 00 27.196980048   16.85       ~ 63 1
4 3C 403.0 Sy2 19 52 15.7996999344 +02 30 24.238200816   15.42 16.5     ~ 309 1
5 QSO B2000-330 QSO 20 03 24.1161711720 -32 51 45.136882080   18.83 18.4 17.11   ~ 256 1
6 ACO 3670 ClG 20 14 17 -29 44.9           ~ 8 1
7 2MASX J20141866-2942364 BiC 20 14 18.6971661264 -29 42 36.426933864   17.65   15.89   ~ 9 1

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2022.05.26-04:39:30

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