2004A&A...427...79J


Query : 2004A&A...427...79J

2004A&A...427...79J - Astronomy and Astrophysics, volume 427, 79-86 (2004/11-3)

Spectral ageing in the relic radio galaxy B2 0924+30.

JAMROZY M., KLEIN U., MACK K.-H., GREGORINI L. and PARMA P.

Abstract (from CDS):

The radio spectrum of the relic radio galaxy B2 0924+30 is investigated using integrated flux densities between 0.151 and 10.6GHz, as well as images at 0.325, 0.609, 1.400 and 4.750GHz. Allowing for synchrotron and inverse Compton losses in this source, the observed spectral steepening yields a break frequency of ∼7 GHz, implying a mean particle age of about 50Myrs. The corresponding particle advance speed is of the order of 2000km/s. This relatively small particle lifetime following the exhaustion of the central source can explain the paucity of such sources and implies that such objects would easily escape detection if searched for in the cm wavelength regime.

Abstract Copyright:

Journal keyword(s): radio continuum: galaxies - galaxies: active - galaxies: individual: B2 0924+30

Simbad objects: 5

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Number of rows : 5
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 NAME 0917+75 Relic rG 09 22 11.400 +74 59 31.00           ~ 15 0
2 2MASX J09272355+2955293 rG 09 27 23.5416653040 +29 55 29.521460100           ~ 20 0
3 B2.1 0924+30 Rad 09 27 37.7 +29 56 40           ~ 15 1
4 IC 2476 LIN 09 27 52.8290410824 +29 59 08.744484660   14.5       ~ 92 0
5 [VBM97] J1324-3138 rG 13 24.0 -31 38           ~ 8 0

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2023.02.02-20:01:56

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