2011A&A...526A..51K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:13:32

2011A&A...526A..51K - Astronomy and Astrophysics, volume 526A, 51-51 (2011/2-1)

A possible jet precession in the periodic quasar B0605-085.

KUDRYAVTSEVA N.A., BRITZEN S., WITZEL A., ROS E., KAROUZOS M., ALLER M.F., ALLER H.D., TERAESRANTA H., ECKART A. and ZENSUS J.A.

Abstract (from CDS):

The quasar B0605-085 (OH 010) shows a hint for probable periodical variability in the radio total flux-density light curves. We study the possible periodicity of B0605-085 in the total flux-density, spectra, and opacity changes in order to compare it with jet kinematics on parsec scales. We have analyzed archival total flux-density variabilities at ten frequencies (408MHz, 4.8GHz, 6.7GHz, 8GHz, 10.7GHz, 14.5GHz, 22GHz, 37GHz, 90GHz, and 230GHz) together with the archival high-resolution very long baseline interferometry data at 15 GHz from the MOJAVE monitoring campaign. Using the Fourier transform and discrete autocorrelation methods we have searched for periods in the total flux-density light curves. In addition, spectral evolution and changes of the opacity have been analyzed. We found a period in multi-frequency total flux-density light curves of 7.9±0.5yrs. Moreover, a quasi-stationary jet component C1 follows a prominent helical path on a similar timescale of eight years. We have also found that the average instantaneous speeds of the jet components show a clear helical pattern along the jet with a characteristic scale of 3mas. Taking into account average speeds of jet components, this scale corresponds to a timescale of about 7.7 years. Jet precession can explain the helical path of the quasi-stationary jet component C1 and the periodical modulation of the total flux-density light curves. We have fitted a precession model to the trajectory of the jet component C1, with a viewing angle φ0=2.6°±2.2°, aperture angle of the precession cone Ω=23.9°±1.9° and fixed precession period (in the observers frame) P=7.9yrs.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: jets - radio continuum: galaxies - quasars: general - quasars: individual: B0605-085

Simbad objects: 6

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Number of rows : 6

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 B0605-0834 QSO 06 07 59.69923743 -08 34 49.9781718     18.5 17.70   ~ 394 1
2 QSO J0738+1742 BLL 07 38 07.39374766 +17 42 18.9982302   16.76 16.22 15.78   ~ 895 1
3 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 1997 1
4 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2702 2
5 3C 345 QSO 16 42 58.8100340220 +39 48 36.999540578   16.81 16.59 16.84   ~ 1552 2
6 8C 1803+784 BLL 18 00 45.6831135718 +78 28 04.017792333   16.4 16.4 15.46   ~ 660 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:13:32

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