2000A&AS..146..293S


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.22CET15:31:55

2000A&AS..146..293S - Astron. Astrophys., Suppl. Ser., 146, 293-322 (2000/October-2)

A new sample of giant radio galaxies from the WENSS survey. II. A multi-frequency radio study of a complete sample: Properties of the radio lobes and their environment.

SCHOENMAKERS A.P., MACK K.-H., DE BRUYN A.G., ROETTGERING H.J.A., KLEIN U. and VAN DER LAAN H.

Abstract (from CDS):

We have formed a complete sample of 26 low redshift (z≲0.3) giant radio galaxies (GRGs) from the WENSS survey, selected at flux densities above 1 Jy at 325 MHz. We present 10.5-GHz observations with the 100-m Effelsberg telescope of 18 sources in this sample. These observations, together with similar data of the remaining eight sources, are combined with data from the WENSS, NVSS and GB6 surveys to study the radio properties of the lobes of these sources at arcminute resolution. We investigate radio source asymmetries, equipartition energy densities in the lobes, the presence of lobe pressure evolution with redshift, the spectral age and the density of the environments of these sources. We find that the armlength asymmetries of GRGs are slightly larger than those of smaller sized 3CR radio galaxies and that these are difficult to explain as arising from orientation effects only. We also find indications that the lobes of the GRGs, despite their large sizes, are still overpressured with respect to their environment. Further, we argue that any evolution of lobe pressure with redshift in these large sources (e.g. Cotter, 1998, in Observational cosmology with the new radio surveys, p. 233) is due to selection effects. For sources which could be used in a spectral ageing analysis, we find spectral ages which are large, typically a few times 107yr. This is comparable to earlier studies of some giant sources and indicates that such large spectral ages are common for this class of radio source. The advance velocities of the radio lobes are typically a few percent of the speed of light, which is higher than those found for smaller, low power (<1026.5W/Hz at 178 MHz) radio sources, and more comparable to higher power radio sources. This suggests that the GRGs in our sample are the oldest members of the group of relatively high power radio sources whose radio powers have evolved to their currently observed lower values (cf. Kaiser et al., 1997).

Abstract Copyright:

Journal keyword(s): galaxies: active - intergalactic medium - galaxies: jets - radio continuum: galaxies

Simbad objects: 29

goto Full paper

goto View the reference in ADS

Number of rows : 29

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 2MASX J00533165+4031255 Sy2 00 53 31.656 +40 31 25.54     18.80     ~ 8 0
2 NGC 315 LIN 00 57 48.88335 +30 21 08.8122 12.80 12.20 11.16 11.26   ~ 694 2
3 NGC 383 rG 01 07 24.95870 +32 24 45.2140   13.6 12.14     ~ 712 3
4 3C 35 QSO 01 12 02.216 +49 28 35.24     15.6     ~ 137 0
5 4C 39.04 rG 01 39 30.454 +39 57 02.82     18     ~ 44 2
6 [VV2006] J021415.4+325105 Sy2 02 14 15.2307 +32 51 05.626     17.60     ~ 6 0
7 7C 022237.39+401812.00 G 02 25 44.8957900843 +40 31 33.234310983           ~ 12 1
8 ICRF J031301.9+412001 Sy1 03 13 01.96212305 +41 20 01.1835585   18.0   14.59   ~ 116 0
9 2MASX J06542643+7319500 Sy2 06 54 26.435 +73 19 50.01     11.7     ~ 13 0
10 2MASX J07020626+4859202 rG 07 02 06.268 +48 59 20.30           ~ 10 0
11 4C 56.16 rG 07 49 48.1 +55 54 19           ~ 164 1
12 4C 75.02A Sy2 08 19 50.5261684792 +75 38 39.564279880     17.50     ~ 18 0
13 7C 094437.60+732735.00 Sy2 09 49 45.967 +73 14 23.25   16.00   11.7   ~ 96 1
14 ICRF J100601.7+345410 Sy1 10 06 01.75030199 +34 54 10.4005583   15.97       ~ 403 2
15 OHIO L 550 rG 10 33.2 +56 45           ~ 17 0
16 4C 74.17 Rad 11 00 41.90 +74 09 01.8   16       ~ 12 1
17 2MASS J12160960+4159283 Sy2 12 16 09.5999767879 +41 59 28.338229906   19.81 19.16     ~ 20 0
18 FIRST J131201.9+405703 Rad 13 12 01.93 +40 57 03.5           ~ 3 0
19 4C 69.15 rG 13 13 58.854 +69 37 18.00           ~ 28 0
20 2MASS J14004343+3019185 BiC 14 00 43.436 +30 19 18.50           ~ 34 1
21 NVSS J140046+302106 Rad 14 00 46.00 +30 21 06.6           ~ 34 1
22 NVSS J142819+291845 rG 14 28 19.200 +29 18 43.74           ~ 10 0
23 2MASX J14530283+3308423 BiC 14 53 02.863 +33 08 42.41           ~ 28 2
24 NVSS J153657+842310 rG 15 36 57.335 +84 23 10.42           ~ 8 0
25 GB6 B1626+5147 Rad 16 27 42.0 +51 41 02           ~ 3 1
26 NGC 6251 Sy2 16 32 31.96990024 +82 32 16.3999540 15.24 14.66 12.89 7.62   ~ 655 0
27 NVSS J191928+514558 rG 19 19 29.3 +51 46 08           ~ 8 1
28 2MAXI J2042+751 Sy1 20 42 37.3081453418 +75 08 02.444858560     14.46 13.80   ~ 208 0
29 2MASX J21452991+8154537 Sy2 21 45 29.919 +81 54 53.70   18.83 17.53     ~ 21 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2000A&AS..146..293S and select 'bookmark this link' or equivalent in the popup menu


2020.02.22-15:31:55

© Université de Strasbourg/CNRS

    • Contact