1999A&A...349...45T


Query : 1999A&A...349...45T

1999A&A...349...45T - Astronomy and Astrophysics, volume 349, 45-54 (1999/9-1)

Modelling the submillimetre-to-radio flaring behaviour of 3C 273.

TUERLER M., COURVOISIER T.J.-L. and PALTANI S.

Abstract (from CDS):

We present a new approach to derive the observed properties of synchrotron outbursts in relativistic jets. The idea is to use the very well sampled submillimetre-to-radio long-term light curves of 3C 273 to extract the spectral and temporal evolution of a typical outburst. The method consists in a decomposition of these light curves into a series of twelve self-similar flares. With a model-independent parameterization, we find that the obtained outburst's evolution is in good qualitative agreement with the expectations of shock models in relativistic jets. We then derive, by a second approach, the relevant parameters of three-stage shock models. We observe for the first time that the optically thin spectral index is steeper during the initial rising phase of the evolution than during the final declining phase as expected by the shock model of Marscher & Gear (1985ApJ...298..114M). We obtain that this index flattens from α=-1.1(Sν∝να) to α=-0.5, in good agreement with what is expected from a power law electron energy distribution of the form N(E)∝E–2.0. The observed flattening gives support to the idea that radiative (synchrotron and/or Compton) losses are the dominant cooling process of the electrons during the initial phase of the shock evolution. Two other results give us confidence in our decomposition: 1) the outbursts that we identify do well correspond to the VLBI components observed in the jet and 2) there is strong evidence that high-frequency peaking outbursts evolve faster than low-frequency peaking outbursts. We propose that this last correlation is related to the distance from the core of the jet at which the shock forms.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: jets - galaxies: quasars: individual: 3C 273 - radio continuum: galaxies

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 QSO B0420-0127 QSO 04 23 15.8007747432 -01 20 33.063518580   17.50 17.00 16.28   ~ 1128 3
2 Mrk 1506 Sy1 04 33 11.0956735296 +05 21 15.619461552   15.72 15.05 10.08   ~ 1915 2
3 [LNH84] 3C 273 A PoC 12 29 06 +02 03.1           ~ 48 1
4 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5555 1
5 3C 279 Bla 12 56 11.1663795384 -05 47 21.528432492   18.01 17.75 15.87   ~ 2863 2
6 3C 345C4 Rad 16 42 58.80665 +39 48 36.9879           ~ 29 0
7 3C 345 QSO 16 42 58.8102993888 +39 48 37.002763188   16.81 16.59 16.84   ~ 1615 2
8 3C 273C7 Rad ~ ~           ~ 7 0
9 3C 273C9 Rad ~ ~           ~ 8 0
10 3C 273D Rad ~ ~           ~ 7 0
11 3C 273C10 Rad ~ ~           ~ 4 0
12 3C 273C x Rad ~ ~           ~ 2 0
13 3C 273X Rad ~ ~           ~ 3 0
14 3C 273C5 Rad ~ ~           ~ 10 0
15 3C 273C6 Rad ~ ~           ~ 7 0
16 3C 273C7 a Rad ~ ~           ~ 4 0
17 3C 273C7 b Rad ~ ~           ~ 3 0
18 3C 273C8 Rad ~ ~           ~ 8 0

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2022.05.20-19:05:15

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