# 2011A&A...526A.148M

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 Query : 2011A&A...526A.148M

2011A&A...526A.148M - Astronomy and Astrophysics, volume 526A, 148-148 (2011/2-1)

MURGIA M., PARMA P., MACK K.-H., DE RUITER H.R., FANTI R., GOVONI F., TARCHI A., GIACINTUCCI S. and MARKEVITCH M.

Abstract (from CDS):

We present a study of five dying'' nearby (z≤0.2) radio galaxies belonging to both the WENSS minisurvey and the B2 bright catalogs WNB1734+6407, WNB1829+6911, WNB1851+5707, B20120+33, and B21610+29. These sources have been selected on the basis of their extremely steep broad-band radio spectra, which strongly indicates that either these objects belong to the rare class of dying radio galaxies or we are observing fossil'' radio plasma remaining from a previous instance of nuclear activity. We derive the relative duration of the dying phase from the fit of a synchrotron radiative model to the radio spectra of the sources. The modeling of the integrated spectra and the deep spectral index images obtained with the VLA confirmed that in these sources the central engine has ceased to be active for a significant fraction of their lifetime, although their extended lobes have not yet completely faded away. We found that WNB1851+5707 is in reality composed of two distinct dying galaxies, which appear blended together as a single source in the WENSS. In the cases of WNB1829+6911 and B2 0120+33, the fossil radio lobes are seen in conjunction with a currently active core. A very faint core is also detected in a MERLIN image of WNB1851+5707a, one of the two dying sources composing WNB1851+5707. We found that all sources in our sample are located (at least in projection) at the center of an X-ray emitting cluster. Our results suggest that the duration of the dying phase for a radio source in a cluster can be significantly higher than that of a radio galaxy in the field, although no firm conclusions can be drawn because of the small number statistics involved. The simplest interpretation of the tendency for dying galaxies to be found in clusters is that the low-frequency radio emission from the fading radio lobes lasts longer if their expansion is somewhat reduced or even stopped. Another possibility is that the occurrence of dying sources is higher in galaxy clusters. We argue that radio sources in dense environments, such as the center of cooling core clusters, may have a peculiar accretion mode which results in a bursting duty cycle sequence of active and quiescent periods. This result could have important implications for theories of the life cycles of radio sources and AGN feedback in clusters of galaxies but awaits confirmation from future observations of larger, statistically significant, samples of objects.

Journal keyword(s): radio continuum: galaxies - galaxies: active - galaxies: clusters: general

Nomenclature: Fig. 3, Table 1: [MPM2011] WNB1851+5707a (Nos a-b).

Full paper

 Number of rows : 23
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 ZwCl 0107+3212 ClG 01 10.3 +32 28     12.14     ~ 22 0
2 NGC 507 BiC 01 23 39.950 +33 15 22.22   13.0       ~ 416 3
3 ZwCl 0120+3300 ClG 01 23 41.0 +33 15 40           ~ 74 0
4 NAME NGC 507 Group GrG 01 23.7 +33 15           ~ 77 0
5 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2693 2
6 2MASX J09272355+2955293 rG 09 27 23.5416653040 +29 55 29.521460100           ~ 20 0
7 B2.1 0924+30 Rad 09 27 37.7 +29 56 40           ~ 15 1
8 WBB N45-384 GrG 09 27 51.8 +30 01 55           ~ 8 0
9 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4099 2
10 QSO B1404+286 BLL 14 07 00.3941769384 +28 27 14.692128372   16.13 15.35 10.29   ~ 729 2
11 BAX 218.5040+03.7812 ClG 14 34 00.9 +03 46 52     14.19     ~ 30 0
12 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 570 3
13 ACO 2162 ClG 16 12 30.0 +29 32 23           ~ 147 0
14 NGC 6086 BiC 16 12 35.5357829352 +29 29 05.246712168   14.8       ~ 183 1
15 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1132 1
16 3C 338.0 QSO 16 28 38.2446374616 +39 33 04.235250060   12.78 11.78     ~ 730 5
17 ACO 2276 ClG 17 35 05.4 +64 06 05           ~ 20 0
18 ZwCl 1829+6912 ClG 18 29 05.68 +69 14 06.1           ~ 14 0
19 ICRF J185152.3+610038 QSO 18 51 52.3607225880 +61 00 38.773585836           ~ 13 1
20 WN B1851+5707 ClG 18 52 08.35 +57 11 42.7           ~ 19 0
21 2MASX J18520859+5711430 BiC 18 52 08.5576417776 +57 11 42.459306504           ~ 4 0
22 [MPM2011] WNB1851+5707b rG 18 52 09.70 +57 11 56.6           ~ 2 0
23 ACO 2622 ClG 23 34 53 +27 25.6           ~ 89 0

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2022.08.19-04:15:41