1999A&A...344....7P

Query : 1999A&A...344....7P

1999A&A...344....7P - Astronomy and Astrophysics, volume 3447-16 (1999/4-1)

Radiative ages in a representative sample of low luminosity radio galaxies.

PARMA P., MURGIA M., MORGANTI R., CAPETTI A., DE RUITER H.R. and FANTI R.

Abstract (from CDS):

Two frequency observations, mainly at 1.4 and 5GHz from the VLA, have been used to study spectral variations along the lobes of some nearby low luminosity radio galaxies that constitute a representative sample selected from the B2 catalogue. The variations of the spectral index have been interpreted as being due to synchrotron and inverse Compton losses and characteristic spectral ages are deduced for the relativistic electrons. The radiative ages are in the range of several 107 years. These ages correlate well with the source sizes. They also appear to be consistent with dynamical ages determined from ram-pressure arguments, if we make reasonable assumptions about the ambient gas density and allow for very moderate deviations from the equipartition conditions. There appears to be a significant difference between the radiative ages of sources in our sample and those of more powerful 3CR radio sources. We briefly discuss the possibility of re-acceleration processes and indicate some objects where these may occur.

Abstract Copyright: ∼

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

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Z 479-45 rG 00 37 05.4904711536 +25 41 56.361743556   14.8       ~ 83 0
2 NGC 315 LIN 00 57 48.88334410 +30 21 08.8119345 12.80 12.20 11.16 11.26   ~ 869 2
3 NGC 326 rG 00 58 22.73535 +26 51 55.9192   14.9 13     ~ 188 1
4 NGC 383 AGN 01 07 24.9647814840 +32 24 45.132586200   13.6 12.14     ~ 821 3
5 Z 522-118 rG 02 09 38.5601991144 +35 47 50.778945420   14.9 13.0     ~ 154 2
6 Z 541-15 rG 03 29 23.8863408096 +39 47 31.958110536   14.9       ~ 99 0
7 NGC 2484 Sy2 07 58 28.10812817 +37 47 11.8076475   14.15 14.9     ~ 284 1
8 4C 32.25 rG 08 31 27.4853256456 +32 19 26.844496896   16.0       ~ 87 2
9 ICRF J083915.8+285038 Sy2 08 39 15.82767313 +28 50 38.8026348   16.0 14.90     ~ 109 1
10 IC 2402 LIN 08 47 59.04615 +31 47 08.3731   14.99       ~ 140 2
11 NVSS J091153+372414 rG 09 11 53.6156551968 +37 24 13.311359568   16.1       ~ 74 1
12 4C 36.14 rG 09 25 39.0699207816 +36 27 05.595461172   16.71       ~ 72 1
13 IC 2476 LIN 09 27 52.8290410824 +29 59 08.744484660   14.5       ~ 100 0
14 NVSS J100757+280147 rG 10 07 57.0708319728 +28 01 47.966189592           ~ 38 0
15 Z 155-59 SyG 11 05 22.8189218232 +30 09 41.606496180   15.7       ~ 63 0
16 Z 156-46 rG 11 16 34.6160545656 +29 15 17.112000564   15.02 14.90     ~ 133 1
17 Z 156-60 rG 11 18 59.3652976295 +27 54 07.004967404   15.7       ~ 42 1
18 B2 1243+26 B rG 12 46 21.86992 +26 27 16.8487   19.7       ~ 47 1
19 NGC 4839 BiC 12 57 24.3563164776 +27 29 52.203087132 13.56 13.02 12.06     ~ 482 3
20 NGC 5127 LIN 13 23 45.0315298080 +31 33 56.527040808   13.9       ~ 183 0
21 NGC 5141 Sy2 13 24 51.44109717 +36 22 42.7725745   13.9       ~ 192 1
22 NVSS J135013+281644 rG 13 50 13.5886368960 +28 16 45.022767744   16.02       ~ 43 1
23 NVSS J140000+283038 rG 14 00 00.47 +28 30 38.2           ~ 38 1
24 FIRST J140043.4+301918 rG 14 00 43.4331694248 +30 19 18.618015432           ~ 38 1
25 NVSS J140046+302106 Rad 14 00 46.30 +30 21 22.6           ~ 36 1
26 Z 163-41 Sy2 14 24 40.5266308536 +26 37 30.467191764   15.6 15.62     ~ 119 1
27 Z 134-24 rG 14 44 06.2864704824 +26 01 11.459794800   15.7       ~ 29 1
28 2MASX J14575384+2832188 Sy2 14 57 53.8041194496 +28 32 18.736654452   16.00       ~ 48 1
29 4C 28.39 LIN 15 23 26.9109001896 +28 37 32.500601976   15.68 15.5     ~ 78 0
30 NVSS J152744+285506 rG 15 27 44.4099822504 +28 55 06.607834248           ~ 77 1
31 NVSS J153015+290111 rG 15 30 10.2734781888 +29 00 30.167945712           ~ 52 0
32 7C 160942.39+311039.00 G 16 11 40.2410530344 +31 03 01.136940408           ~ 29 1
33 NVSS J161531+272657 rG 16 15 31.3601937240 +27 26 57.334964640           ~ 45 1
34 NGC 6109 LIN 16 17 40.54006 +35 00 15.1861   14.9       ~ 193 1
35 3C 332.0 Sy1 16 17 42.5380089648 +32 22 34.372277976   18.25 17.45     ~ 268 1
36 NGC 6137 rG 16 23 03.1194649896 +37 55 20.550626868   14.1       ~ 130 1
37 NGC 6166 Sy2 16 28 38.24470063 +39 33 04.2335319   12.78 11.78     ~ 793 2
38 B2 1643+27 rG 16 45 27.6784943280 +27 20 05.790924312           ~ 36 0
39 4C 30.31 rG 17 00 45.2320367856 +30 08 12.874902000   15.00 14.3     ~ 76 0
40 4C 31.47 rG 17 28 20.1089243496 +31 46 02.604685584   15.5       ~ 131 1
41 NVSS J182852+321855 Rad 18 28 52.89 +32 18 55.0           ~ 35 1
42 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2
43 Z 514-50 SyG 22 31 20.5885689288 +39 21 29.593072404   14.6       ~ 446 1
44 Z 514-80 rG 22 38 29.417 +35 19 46.84   15.0       ~ 108 1
45 NGC 7720 Sy1 23 38 29.38324020 +27 01 53.2580084   13.9 13.3     ~ 565 4

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