2009A&A...506L..33M


Query : 2009A&A...506L..33M

2009A&A...506L..33M - Astronomy and Astrophysics, volume 506, L33-36 (2009/11-1)

Evidence of a double-double morphology in B0818+214.

MARECKI A. and SZABLEWSKI M.

Abstract (from CDS):

The so-called double-double structure in radio sources is the most conspicuous signature of their restarted activity. Observations indicate that in the majority of double-double radio sources (DDRS), the span of the radio lobes is larger than 0.7Mpc. This lower limit is also suggested by theory. However, it seemed likely that the apparent core of B0818+214, a radio galaxy with an overall linear size of its radio structure below that limit, could harbour a compact double well aligned with the outer lobes so that the whole object would fulfil the criteria of a DDRS. Here, we present evidence that the central component of B0818+214, when magnified through the EVN+MERLIN 18-cm observations, shows two FRII-like lobes. As the separation of the inner lobes is not greater than 5.7kpc, they are immersed in the ISM of the host galaxy. This circumstance is the likely reason why the inner double has become visible, despite the predictions of the theory according to which B0818+214 as a whole is too small for a new double to develop inside the cocoon inflated during the previous active phase. Moreover, we speculate that its host galaxy is not active at the moment and so the inner double may be in the coasting phase often observed in other medium-sized symmetric objects with intermittent activity. It could be, therefore, that two different mechanisms of accretion disk instabilities, ionisation and radiation-pressure driven, may be independently responsible for triggering active phases, manifesting as the outer and the inner doubles, respectively.

Abstract Copyright:

Journal keyword(s): radio continuum: galaxies - galaxies: active - galaxies: individual: B0818+214

Nomenclature: Fig. 1, Table 1: [MS2009b] AN (Nos A1-C1, A2-B2).

Simbad objects: 12

goto Full paper

goto View the references in ADS

Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 PKS 0114-47 rG 01 16 25.0503696336 -47 22 41.107795248   16.5 16.5     ~ 62 1
2 2MASX J03513577-2744345 Sy2 03 51 35.7643720392 -27 44 34.896912468   16.0       ~ 141 1
3 NVSS J082107+211704 rG 08 21 07.510 +21 17 02.86           ~ 8 1
4 FIRST J092800.2+414254 rG 09 28 00.24 +41 42 54.5           ~ 3 0
5 4C 02.27 QSO 09 35 18.1942545696 +02 04 15.563959968   17.31 17.16     ~ 115 1
6 3C 236.0 BLL 10 06 01.75023017 +34 54 10.4016113   15.97       ~ 434 2
7 FIRST J124235.2+383836 rG 12 42 35.277 +38 38 36.77           ~ 6 2
8 ICRF J124733.3+672316 QSO 12 47 33.32959326 +67 23 16.4488689           ~ 81 1
9 NVSS J145217+330405 rG 14 52 17.752 +33 04 06.68           ~ 3 0
10 PKS 1545-321 rG 15 48 58.0331477149 -32 16 58.157614838           ~ 46 1
11 ICRF J170844.6+003509 Sy2 17 08 44.64743906 +00 35 09.5151481   23.71 22.15 19.7   ~ 43 1
12 8C 1834+620 Sy2 18 35 10.920 +62 04 08.14           ~ 48 2

To bookmark this query, right click on this link: simbad:objects in 2009A&A...506L..33M and select 'bookmark this link' or equivalent in the popup menu


2022.12.03-17:23:41

© Université de Strasbourg/CNRS

    • Contact