Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...276...56m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 276, Jan. 1, 1984, p. 56-59.
Astronomy and Astrophysics
Astronomy
42
Brightness Distribution, Centimeter Waves, Quasars, Radio Sources (Astronomy), Very Long Base Interferometry, Astronomical Maps, Radio Spectra, Wavelengths
Scientific paper
VLBI observations of the quasars 1038 + 528A,B on 1981 March 17 at 3.6 and 13 cm wavelengths with an array of seven antennas were used to obtain a hybrid brightness map of the A quasar and a phase-reference brightness map of the B quasar for each wavelength. Using this phase-reference technique, the relative spatial location of the maps for each wavelength was determined and it was found that the distance between the peaks of brightness of the quasars is shorter at 13 cm than at 3.6 cm by about 0.7 milli-arcsec. This difference is probably intrinsic to the A quasar and due to wavelength-dependent opacity. Determination of the relative position of the two maps of each quasar, likely reliable to about 0.1 mas, allowed spectral-index maps to be made. The morphology of the spectral-index maps is very similar for both quasars, in sharp contrast to the morphologies of the brightness maps.
Marcaide Juan Maria
Shapiro Irwin I.
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