2000A&A...355..552R


Query : 2000A&A...355..552R

2000A&A...355..552R - Astronomy and Astrophysics, volume 355, 552-563 (2000/3-2)

A phase-reference study of the quasar pair 1038+528A,B.

RIOJA M.J. and PORCAS R.W.

Abstract (from CDS):

We present results from λ 3.6 cm observations of the quasar pair 1038+528 A and B, made in 1995 using the VLBA together with the Effelsberg 100m telescope. We describe the use of a phase-referencing technique to measure the astrometric separation between the quasars. We also introduce a new data analysis method - "hybrid double mapping" - which preserves the relative astrometric information in a single VLBI hybrid map for close source pairs. We combine our measurements with those from three previous epochs, the earliest in 1981. Our new observations confirm the evolution within the structure of quasar B, previously proposed to explain the measured change in the relative separation of the pair. Our upper bound for any systematic proper motion between the mass centres of quasars A and B is 10µas/yr. This is set by the limited precision in defining the reference points in the quasars at different epochs and by possible instabilities of the source "core" locations. A separate analysis enables us to put more stringent upper limits to any core motions along the two source axes.

Abstract Copyright:

Journal keyword(s): instrumentation: interferometers - techniques: interferometric - astrometry - radio continuum: general

Simbad objects: 4

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Number of rows : 4
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 B0710+439 QSO 07 13 38.16412910 +43 49 17.2071530   20.7       ~ 237 0
2 8C 0958+561 QSO 10 01 20.6918953728 +55 53 55.593949272   17.16 16.95     ~ 714 3
3 6C 103844+524909 QSO 10 41 46.7816890392 +52 33 28.230749244   16.96 18.5 16.39   ~ 125 1
4 QSO B1038+528B QSO 10 41 48.8979508008 +52 33 55.608768180   18.38 18.23     ~ 105 0

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2022.05.22-13:58:03

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