2011A&A...527A.114V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST19:02:20

2011A&A...527A.114V - Astronomy and Astrophysics, volume 527A, 114-114 (2011/3-1)

Diffuse steep-spectrum sources from the 74 MHz VLSS survey.

VAN WEEREN R.J., ROETTGERING H.J.A. and BRUEGGEN M.

Abstract (from CDS):

Galaxy clusters grow by a sequence of mergers with other clusters and galaxy groups. During these mergers, shocks and/or turbulence are created within the intracluster medium (ICM). In this process, particles could be accelerated to highly relativistic energies. The synchrotron radiation from these particles is observed in the form of radio relics and halos that are generally characterized by a steep radio spectral index. Shocks can also revive fossil radio plasma from a previous episode of AGN activity, creating a so-called radio ``phoenix''. Here we present multi-frequency radio observations of diffuse steep-spectrum radio sources selected from the 74MHz VLSS survey. Previous Giant Metrewave Radio Telescope (GMRT) observations showed that some of these sources had filamentary and elongated morphologies, which are expected for radio relics. We attempt to understand the nature of diffuse steep-spectrum radio sources and characterize their spectral index and polarization properties. We carried out radio continuum observations at 325MHz with the GMRT. Observations with the Very Large Array (VLA) and Westerbork Synthesis Radio Telescope (WSRT) were taken at 1.4GHz in full polarization mode. Optical images around the radio sources were taken with the William Herschel and Isaac Newton Telescope (WHT, INT). Most of the sources in our sample consist of old radio plasma from AGNs located in small galaxy clusters. The sources can be classified as AGN relics or radio phoenices. The spectral indices across most of the radio sources display large variations. We conclude that diffuse steep-spectrum radio sources are not only found in massive X-ray luminous galaxy clusters but also in smaller systems. Future low-frequency surveys will uncover large numbers of steep-spectrum radio relics related to previous episodes of AGN activity.

Abstract Copyright:

Journal keyword(s): radio continuum: galaxies - galaxies: active - galaxies: clusters: general - large-scale structure of Universe

CDS comments: Paragraph 3.4 galaxy cluster/group B02291 not identified.

Simbad objects: 30

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Number of rows : 30

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NVSS J000453-345634 Rad 00 04 54.4 -34 56 26           ~ 3 1
2 ACO 13 ClG 00 13 38.5 -19 30 19           ~ 93 1
3 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 789 0
4 NVSS J011901+112323 Rad 01 19 01.4 +11 23 37           ~ 12 3
5 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2497 2
6 VLSS J0516.2+0103 Rad 05 16 17.89 +01 03 40.1           ~ 2 0
7 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 746 1
8 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1266 1
9 [KMA2007] 138.91895+25.19876 ClG 06 35 10.58 +75 31 55.4           ~ 6 0
10 SDSS J091539.68+251136.9 BiC 09 15 39.679 +25 11 36.90           ~ 2 0
11 SDSS J091541.94+251152.1 Rad 09 15 41.942 +25 11 52.11           ~ 2 0
12 4C 25.24 QSO 09 15 48.1104171500 +25 08 58.984835870           ~ 11 1
13 ACO 3444 ClG 10 23 53.1540 -27 15 07.840           ~ 64 0
14 ACO 1213 ClG 11 16 29.1 +29 15 37           ~ 145 0
15 NVSS J111705+700350 Rad 11 17 05.8 +70 03 51           ~ 3 1
16 UGC 6544 EmG 11 33 42.019 +23 24 45.50   15.1       ~ 31 0
17 7C 1131+2341 Rad 11 33 44.2 +23 25 12           ~ 1 0
18 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3716 1
19 SDSS J143149.62+133159.1 G 14 31 49.622 +13 31 59.12           ~ 4 0
20 [KMA2007] 217.95869+13.53470 ClG 14 31 50.09 +13 32 04.9           ~ 8 0
21 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62     ~ 262 0
22 2MASX J15150860+0423085 GiC 15 15 08.619 +04 23 08.86           ~ 7 0
23 VLSS J1515.1+0424 Rad 15 15 09.18 +04 24 41.1           ~ 2 0
24 ACO 2048 ClG 15 15 16.52 +04 22 46.5           ~ 93 0
25 PMN J1515+0421 rG 15 15 25.058 +04 21 45.56   17       ~ 19 1
26 ICRF J160913.3+264129 Sy2 16 09 13.32076181 +26 41 29.0362080   19       ~ 203 0
27 VLSS J2043.9-1118 Rad 20 43 58.46 -11 18 45.6           ~ 2 0
28 VLSS J2209.5+1546 Rad 22 09 32.91 +15 46 29.9           ~ 2 0
29 VLSS J2217.5+5943 Rad 22 17 31.6 +59 43 07           ~ 8 0
30 VLSS J2241.3-1626 Rad 22 41 22.57 -16 25 35.7           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-19:02:20

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