2008A&A...486..735A


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.08CEST15:05:43

2008A&A...486..735A - Astronomy and Astrophysics, volume 486, 735-739 (2008/8-2)

Synchrotron self-absorption in the GPS radio galaxy B0108+388.

ARTYUKH V.S., CHERNIKOV P.A. and TYUL'BASHEV S.A.

Abstract (from CDS):

The compact radio source in the nucleus of the GPS radio galaxy B0108+388 consists of two jets that have spectra that turn over at frequecies lower than ∼5 GHz. There is evidence that the spectral turnover in B0108+388 results from free-free absorption by non-uniform thermal plasma in central tens of parsecs. To reveal the real cause of the low frequency cutoff in the jet spectra, it is necessary to consider different mechanisms and, in particular, syncrotron self-absorption. We suggest that spectral turnovers at low frequencies of the jets are caused by synchrotron self-absorption. Estimations of physical parameters of these jets were obtained with a method based on a non-uniform synchrotron source model. We find that magnetic fields in these jets are nearly uniform with 10–2<H{perpendicular}<10–1G and with relativistic electron density 101<ne<102cm–3. The relativistic electron energy is higher everywhere in the jets than the magnetic field energy, but by taking the estimated uncertainties into account it is possible that energy equipartition is in effect. We compare the physical conditions in the jets and in the nuclei of classical doubles. We present evidence that the spectral turnover in the B0108+388 results from synchrotron self-absorption.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: magnetic fields - galaxies: jets - radio continuum: galaxies - methods: data analysis

Status at CDS:  

CDS comments: Paragraph 1. Radio source B0108+338 is a probable misprint for QSO B0108+388.

Simbad objects: 10

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Number of rows : 10

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 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 232 1
2 3C 111 Sy1 04 18 21.2773655604 +38 01 35.801523843   19.75 18.05     ~ 846 1
3 NGC 7720 Sy1 23 38 29.38322439 +27 01 53.2583763   13.9 13.3     ~ 510 4
4 [PR88] 0108+388 C4 Rad ~ ~           ~ 3 0
5 [PR88] 0108+388 C6 Rad ~ ~           ~ 4 0
6 [PR88] 0108+388 C3 Rad ~ ~           ~ 4 0
7 [PR88] 0108+388 C7 Rad ~ ~           ~ 5 0
8 [PR88] 0108+388 C2 Rad ~ ~           ~ 4 0
9 [PR88] 0108+388 C1 Rad ~ ~           ~ 5 0
10 [PR88] 0108+388 C5 Rad ~ ~           ~ 5 0

    Equat.    Gal    SGal    Ecl

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2020.04.08-15:05:43

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