Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108..368m&link_type=abstract
The Astronomical Journal, vol. 108, no. 2, p. 368-373
Astronomy and Astrophysics
Astronomy
18
Astrometry, Extragalactic Radio Sources, Quasars, Radio Sources (Astronomy), Very Long Base Interferometry, Astronomical Maps, Radio Spectra, Red Shift, Wavelengths
Scientific paper
We observed the pair of quasars 1038 + 528 A (z = 0.678) and 1038 + 528 B (z = 2.296), separated on the sky by 33 seconds, using very long baseline interferometry in 1981 and 1983, simultaneously at lambda = 3.6 and 13 cm. From hybrid maps of the compact structures of the two quasars made from these observations, we were able to identify reference points in each. By comparing the relative positions of the points in the two quasars, we obtained an estimate of their relative proper motion at lambda = 3.6 cm: 31+/- 22 microarcsec/yr. This value, being only about 1.5 standard deviations, cannot be considered a detection of proper motion. We propose a smooth jet model consistent with this result. The proper-motion prediction from this model differs from that of 'bona fide' proper motion and could likely be distinguished from it with measurements spanning a decade or more, were the maximum instantaneous proper motion to be of the order of 30 microarcsec/yr.
Elosegui P.
Marcaide Juan Maria
Shapiro Irwin I.
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