Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86.1323w&link_type=abstract
Astronomical Journal, vol. 86, Sept. 1981, p. 1323-1331. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
22
Interstellar Masers, Mapping, Point Sources, Radio Spectroscopy, Very Long Base Interferometry, Water Masers, Astronomical Spectroscopy, Diffraction Patterns, Maser Outputs, Power Spectra, Synthetic Apertures
Scientific paper
VLBI observations of astrophysical maser spatial structures consisting of a small number of well separated, compact features at each frequency produce relative-fringe spectra having multiple peaks. Giuffrida (1977) has shown that these peaks can be used to produce maps while avoiding some of the worst calibration difficulties of aperture synthesis. The multiple-point fringe-rate method used to map the H2O maser emission in W3-IRS5 and W3(OH) is described, along with some of its advantages and limitations. It is concluded that the additional details seen in these maps, by comparison to previously published observations, make division of the sources into centers of activity difficult.
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