2006A&A...452.1099P


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.19CET18:39:00

2006A&A...452.1099P - Astronomy and Astrophysics, volume 452, 1099-1106 (2006/6-4)

Astrometric accuracy of phase-referenced observations with the VLBA and EVN.

PRADEL N., CHARLOT P. and LESTRADE J.-F.

Abstract (from CDS):

Astrometric accuracy of complex modern VLBI arrays cannot be calculated analytically. We study the astrometric accuracy of phase-referenced VLBI observations for the VLBA, EVN and global VLBI array by simulating VLBI data for targets at declinations -25°, 0°, 25°, 50°, 75° and 85°. The systematic error components considered in this study are calibrator position, station coordinate, Earth orientation and troposphere parameter uncertainties. We provide complete tables of the astrometric accuracies of these arrays for a source separation of 1° either along the right ascension axis or along the declination axis. Astrometric accuracy is 50µas at mid declination and is 300µas at low (-25°) and high (85 °) declinations for the VLBA and EVN. In extending our simulations to source separations of 0.5 ° and 2 °, we establish the formula for the astrometric accuracy of the VLBA: Δαcosδ,δ=(Δαcosδ,δ-14)*d+14(µas) where Δαcosδ,δ is the astrometric accuracy for a separation d=1° provided in our tables for various declinations and conditions of the wet troposphere. We argue that this formula is also valid for the astrometric accuracy of the EVN and global VLBI array.

Abstract Copyright:

Journal keyword(s): astrometry - techniques: high angular resolution - techniques: interferometric

Simbad objects: 8

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Number of rows : 8

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 4C 54.15 BLL 07 53 01.38456785 +53 52 59.6370745   18.5   16.77   ~ 126 1
2 NVSS J075415+532456 Rad 07 54 15.21748 +53 24 56.4432           ~ 14 1
3 7C 103843.60+524909.00 QSO 10 41 46.78163764 +52 33 28.2313168   16.96 18.5 16.39   ~ 115 1
4 6C 163852+395305 QSO 16 40 29.632771800 +39 46 46.02850331   18.4 16.5 18.75   ~ 267 2
5 3C 345 QSO 16 42 58.8100340220 +39 48 36.999540578   16.81 16.59 16.84   ~ 1539 2
6 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3346 3
7 87GB 221004.9+013803 AGN 22 12 37.9679 +01 52 51.267     21.7     ~ 74 1
8 QSO B2215+020 QSO 22 17 48.23793972 +02 20 10.7121237   21.840 20.420 20.140   ~ 48 1

    Equat.    Gal    SGal    Ecl

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2020.02.19-18:39:00

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