2018A&A...614A..74A


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET12:57:20

2018A&A...614A..74A - Astronomy and Astrophysics, volume 614A, 74-74 (2018/6-1)

Core-shifts and proper-motion constraints in the S5 polar cap sample at the 15 and 43 GHz bands.

ABELLAN F.J., MARTI-VIDAL I., MARCAIDE J.M. and GUIRADO J.C.

Abstract (from CDS):

We have studied a complete radio sample of active galactic nuclei with the very-long-baseline-interferometry (VLBI) technique and for the first time successfully obtained high-precision phase-delay astrometry at Q band (43 GHz) from observations acquired in 2010. We have compared our astrometric results with those obtained with the same technique at U band (15 GHz) from data collected in 2000. The differences in source separations among all the source pairs observed in common at the two epochs are compatible at the 1σ level between U and Q bands. With the benefit of quasi-simultaneous U and Q band observations in 2010, we have studied chromatic effects (core-shift) at the radio source cores with three different methods. The magnitudes of the core-shifts are of the same order (about 0.1 mas) for all methods. However, some discrepancies arise in the orientation of the core-shifts determined through the different methods. In some cases these discrepancies are due to insufficient signal for the method used. In others, the discrepancies reflect assumptions of the methods and could be explained by curvatures in the jets and departures from conical jets.

Abstract Copyright: © ESO 2018

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

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 NAME NCP reg 00 00 00 +90 00.0           ~ 135 0
2 QSO B0016+73 QSO 00 19 45.78641940 +73 27 30.0174396     19.0 18.26   ~ 269 1
3 QSO B0153+744 QSO 01 57 34.9662542558 +74 42 43.219635727   16 16.0 16.7   ~ 193 1
4 6C 021252+733537 BLL 02 17 30.8143057005 +73 49 32.612359669     19.0 18.97   ~ 401 1
5 QSO B0454+844 BLL 05 08 42.36345199 +84 32 04.5440155     16.5 18.95   ~ 226 1
6 6C 061543+820331 QSO 06 26 03.00616906 +82 02 25.5678202   17.5 17.5 18.52   ~ 144 1
7 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1105 1
8 4C 71.07 QSO 08 41 24.36526906 +70 53 42.1730054     16.5 16.8   ~ 682 1
9 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3900 5
10 6C 103917+811008 QSO 10 44 23.06254789 +80 54 39.4430277     16.5 18.29   ~ 178 1
11 6C 115021+811507 QSO 11 53 12.49919940 +80 58 29.1545750     18.5 18.54   ~ 216 1
12 7C 1749+7006 BLL 17 48 32.8399653579 +70 05 50.768853537   17.46 17.01 15.48   ~ 378 1
13 8C 1803+784 BLL 18 00 45.6831135718 +78 28 04.017792333   16.4 16.4 15.46   ~ 651 1
14 ICRF J192748.4+735801 Sy1 19 27 48.4944745594 +73 58 01.571908984     15.5 15.11   ~ 485 2
15 8C 2007+777 BLL 20 05 30.9981060951 +77 52 43.245329882     16.5 17.36   ~ 397 1

    Equat.    Gal    SGal    Ecl

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2019.12.12-12:57:20

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