2016A&A...596A..27M


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.22CET12:12:04

2016A&A...596A..27M - Astronomy and Astrophysics, volume 596A, 27-27 (2016/12-1)

Absolute kinematics of radio-source components in the complete S5 polar cap sample. IV. Proper motions of the radio cores over a decade and spectral properties.

MARTI-VIDAL I., ABELLAN F.J., MARCAIDE J.M., GUIRADO J.C., PEREZ-TORRES M.A. and ROS E.

Abstract (from CDS):

We have carried out a high-precision astrometric analysis of two very-long-baseline-interferometry (VLBI) epochs of observation of the 13 extragalactic radio sources in the complete S5 polar cap sample. The VLBI epochs span a time baseline of ten years and enable us to achieve precisions in the proper motions of the source cores up to a few micro-arcseconds per year. The observations were performed at 14.4GHz and 43.1GHz, and enable us to estimate the frequency core-shifts in a subset of sources, for which the spectral-index distributions can be computed. We study the source-position stability by analysing the changes in the relative positions of fiducial source points (the jet cores) over a decade. We find motions of 0.1-0.9mas among close-by sources between the two epochs, which imply drifts in the jet cores of approximately a few tens of µas per year. These results have implications for the standard Active Galactic Nucleus (AGN) jet model (where the core locations are supposed to be stable in time). For one of our sources, 0615+820, the morphological and spectral properties in year 2010, as well as the relative astrometry between years 2000 and 2010, suggest the possibility of either a strong parsec-scale interaction of the AGN jet with the ISM, a gravitational lens with ∼1mas diameter, or a resolved massive binary black hole.

Abstract Copyright: © ESO, 2016

Journal keyword(s): astrometry - quasars: general - techniques: interferometric - BL Lacertae objects: general - radio continuum: general

Simbad objects: 15

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Number of rows : 15

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 B0016+73 QSO 00 19 45.78641940 +73 27 30.0174396     19.0 18.26   ~ 270 1
2 QSO B0153+744 QSO 01 57 34.9662542558 +74 42 43.219635727   16 16.0 16.7   ~ 194 1
3 6C 021252+733537 BLL 02 17 30.8143057005 +73 49 32.612359669     19.0 18.97   ~ 402 1
4 QSO B0454+844 BLL 05 08 42.36345199 +84 32 04.5440155     16.5 18.95   ~ 227 1
5 6C 061543+820331 QSO 06 26 03.00616906 +82 02 25.5678202   17.5 17.5 18.52   ~ 145 1
6 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1112 1
7 4C 71.07 QSO 08 41 24.36526906 +70 53 42.1730054     16.5 16.8   ~ 685 1
8 7C 103843.60+524909.00 QSO 10 41 46.78163764 +52 33 28.2313168   16.96 18.5 16.39   ~ 115 1
9 6C 103917+811008 QSO 10 44 23.06254789 +80 54 39.4430277     16.5 18.29   ~ 179 1
10 6C 115021+811507 QSO 11 53 12.49919940 +80 58 29.1545750     18.5 18.54   ~ 217 1
11 7C 1749+7006 BLL 17 48 32.8399653579 +70 05 50.768853537   17.46 17.01 15.48   ~ 379 1
12 8C 1803+784 BLL 18 00 45.6831135718 +78 28 04.017792333   16.4 16.4 15.46   ~ 652 1
13 ICRF J192748.4+735801 Sy1 19 27 48.4944745594 +73 58 01.571908984     15.5 15.11   ~ 486 2
14 8C 2007+777 BLL 20 05 30.9981060951 +77 52 43.245329882     16.5 17.36   ~ 399 1
15 QSO B2136+1410 QSO 21 39 01.30926937 +14 23 35.9922096     18.5 18.22   ~ 225 1

    Equat.    Gal    SGal    Ecl

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2020.01.22-12:12:04

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