2016A&A...585A..29B


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.27CET11:53:12

2016A&A...585A..29B - Astronomy and Astrophysics, volume 585A, 29-29 (2016/1-1)

LOFAR discovery of a 700-kpc remnant radio galaxy at low redshift.

BRIENZA M., GODFREY L., MORGANTI R., VILCHEZ N., MADDOX N., MURGIA M., ORRU E., SHULEVSKI A., BEST P.N., BRUEGGEN M., HARWOOD J.J., JAMROZY M., JARVIS M.J., MAHONY E.K., McKEAN J. and ROETTGERING H.J.A.

Abstract (from CDS):

Remnant radio galaxies represent the final dying phase of radio galaxy evolution in which the jets are no longer active. Remnants are rare in flux-limited samples, comprising at most a few percent. As a result of their rarity and because they are difficult to identify, this dying phase remains poorly understood and the luminosity evolution is largely unconstrained. Here we present the discovery and detailed analysis of a large (700kpc) remnant radio galaxy with a low surface brightness that has been identified in LOFAR images at 150MHz. By combining LOFAR data with new follow-up Westerbork observations and archival data at higher frequencies, we investigated the source morphology and spectral properties from 116 to 4850MHz. By modelling the radio spectrum, we probed characteristic timescales of the radio activity. The source has a relatively smooth, diffuse, amorphous appearance together with a very weak central compact core that is associated with the host galaxy located at z=0.051. From our ageing and morphological analysis it is clear that the nuclear engine is currently switched off or, at most, active at a very low power state. We find that the source has remained visible in the remnant phase for about 60Myr, significantly longer than its active phase of 15Myr, despite being located outside a cluster. The host galaxy is currently interacting with another galaxy located at a projected separation of 15kpc and a radial velocity offset of ∼300km/s. This interaction may have played a role in the triggering and/or shut-down of the radio jets. The spectral shape of this remnant radio galaxy differs from most of the previously identified remnant sources, which show steep or curved spectra at low to intermediate frequencies. Our results demonstrate that remnant radio galaxies can show a wide range of evolutionary paths and spectral properties. In light of this finding and in preparation for new-generation deep low-frequency surveys, we discuss the selection criteria to be used to select representative samples of these sources.

Abstract Copyright:

Journal keyword(s): galaxies: active - radio continuum: galaxies - galaxies: individual: J1828+49

Simbad objects: 23

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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 - 2021
#notes
1 2MASX J00340560-6639354 rG 00 34 05.5 -66 39 34           ~ 5 0
2 NGC 1167 LIN 03 01 42.358 +35 12 20.34   13.84 12.77     ~ 305 2
3 NGC 1534 GiG 04 08 46.066 -62 47 51.21   13.76   12.23   ~ 23 0
4 2MASX J05155524-8059433 G 05 15 55.0573880587 -80 59 42.961956003   17.02   15.90   ~ 8 0
5 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1295 1
6 NAME 0917+75 Relic rG 09 22 11.400 +74 59 31.00           ~ 15 0
7 2MASX J09272355+2955293 rG 09 27 23.5419613485 +29 55 29.519386983           ~ 20 0
8 B2.1 0924+30 Rad 09 27 37.7 +29 56 40           ~ 15 1
9 [VBM97] J1324-3138 rG 13 24.0 -31 38           ~ 8 0
10 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4056 3
11 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3817 2
12 NGC 5419 BiC 14 03 38.771 -33 58 42.20   11.77 11.33 10.21   ~ 173 2
13 NGC 5590 GiG 14 21 38.416 +35 12 17.86   13.6       ~ 48 1
14 VV 204 AGN 15 04 57.120 +26 00 58.46   15.24       ~ 276 0
15 3C 314.1 rG 15 10 23.1 +70 45 54   17       ~ 89 0
16 NGC 6086 BiC 16 12 35.531 +29 29 05.19   14.8       ~ 178 1
17 ZwCl 1810+4949 ClG 18 11 00.1 +49 54 40     14.8     ~ 48 0
18 2MASX J18282048+4914428 G 18 28 20.486 +49 14 42.87           ~ 4 0
19 2MASX J18282089+4914278 G 18 28 20.89 +49 14 27.8           ~ 1 0
20 WB 1827+4914 Rad 18 28.4 +49 16           ~ 2 1
21 ICRF J182931.7+484446 Sy1 18 29 31.7812801678 +48 44 46.158815781   17.05 16.81 16.860   ~ 640 1
22 3C 386.0 rG 18 38 26.237 +17 11 49.75   15.85 14.6     ~ 186 2
23 ACO 2622 ClG 23 34 53 +27 25.6           ~ 87 0

    Equat.    Gal    SGal    Ecl

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2021.01.27-11:53:12

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