Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..504l&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 504-512. Research supported by the Miller Institute and NSF.
Astronomy and Astrophysics
Astrophysics
42
Astronomical Models, Galactic Nuclei, Galactic Radio Waves, Galactic Structure, Very Long Base Interferometry, Electron Distribution, Gravitational Collapse, Pulsars, Spectrum Analysis
Scientific paper
An attempt to determine the source structure of the galactic center compact radio source through VLBI observations at 6.0, 3.6, 2.8, and 1.35 cm is reported. It is found that: (1) at 6.0 cm and 3.6 cm, the sizes were about 0.05 and 0.015 arcsec, respectively; (2) the 0.001 arcsec core component reported by Kellerman et al. (1976) at 3.8 cm was not detected at 3.6 cm; and (3) the observations do not allow a distinction between suggestions that radio source apparent size is controlled by interstellar electron scattering or by free-free self-absorption. While the source structure is therefore not yet known despite these measurements, an absolute upper limit of 10 to the 15th cm can be set to the linear size, posing a constraint on possible physical models of the underlying energy source. The plausibility of pulsar, binary stellar radio source and massive collapsed object models is discussed.
Backer Donald C.
Cohen Morrel H.
Lo Kwok Yung
Readhead Anthony C. S.
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