2005A&A...433..467J


Query : 2005A&A...433..467J

2005A&A...433..467J - Astronomy and Astrophysics, volume 433, 467-477 (2005/4-2)

Ageing analysis of the giant radio galaxy J1343+3758.

JAMROZY M., MACHALSKI J., MACK K.-H. and KLEIN U.

Abstract (from CDS):

Deep 4860 and 8350 MHz observations with the VLA and 100-m Effelsberg telescopes, supplementing available radio survey maps at the frequencies of 327MHz (WENSS survey) and 1400MHz (NVSS survey), are used to study the synchrotron spectra and radiative ages of relativistic particles in opposite lobes of the giant radio galaxy J1343+3758 (Machalski & Jamrozy, 2000A&A...363L..17M). The classical spectral ageing analysis (e.g. Myers & Spangler, 1985ApJ...291...52M) with assumption of equipartition magnetic fields gives a mean separation velocity (<vsep>) of about 0.16c and 0.12c measured with respect to the emitting plasma, and suggests a maximum particle age of about 48 and 50Myr in the NE and SW lobes, respectively. On the contrary, a mean jet-head advance speed (<vadv>) in the above lobes, derived from ram-pressure arguments, is about 0.016c and 0.017c, respectively. This would imply a substantial backflow of the lobe material from the hotspot regions towards the radio core, vbf, which is not supported by the available radio maps. A compromise is achieved by assuming an enhancement of 3 to 5 times the equipartition magnetic field strengths in the lobes which gives <vsep≥∼0.06c and <vadv≥~<vbf≥∼0.03c, hence a dynamical age of the source of 204±40Myr. A comparison of the radiative and dynamical ages of the investigated giant radio galaxy implies that the dynamical age is about 4 times the maximum synchrotron age of the emitting particles, which supports the conclusion of Blundell & Rawlings (2000AJ....119.1111B) that the spectral and dynamical ages are comparable only when they are ≪10Myr, and suggests that for FRII-type sources the discrepancy between these ages increases with age.

Abstract Copyright:

Journal keyword(s): radio continuum: galaxies - galaxies: active - galaxies: individual: J1343+3758

CDS comments: parag 3.1 the faint optical galaxy = EQ J134252+375728

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 QSO B0437-244 QSO 04 39 09.2940514728 -24 22 08.333670072     18.0     ~ 29 1
2 NVSS J082559+692038 rG 08 25 59.770 +69 20 38.59           ~ 24 0
3 3C 236.0 BLL 10 06 01.75023017 +34 54 10.4016113   15.97       ~ 439 2
4 QSO B1025-229 QSO 10 27 54.8840545224 -23 12 03.047344956     17.5     ~ 29 0
5 [VV98] J132412.0+404812 BLL 13 24 12.09562659 +40 48 11.7620316     19.50 19.4   ~ 40 0
6 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4211 2
7 EQ J134252+375728 G 13 42 52.47 +37 57 28.4           ~ 1 0
8 2MASS J13425450+3758188 AGN 13 42 54.5200910904 +37 58 18.798092148           ~ 20 1
9 2MASS J14004343+3019185 BiC 14 00 43.4331694248 +30 19 18.618015432           ~ 36 1
10 NVSS J140046+302106 Rad 14 00 46.00 +30 21 06.6           ~ 35 1
11 NAME Cyg A Sy2 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2300 2
12 2MASX J21452991+8154537 Sy2 21 45 29.8138871856 +81 54 54.025485660   18.83 17.53     ~ 23 0

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2023.05.30-05:34:41

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