On the size of the galactic centre compact radio source Diameter less than 20 AU

Details On the size of the galactic centre compact radio source Diameter less than 20 AU On the size of the galactic centre compact radio source Diameter less than 20 AU

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.315..124l&link_type=abstract

Nature (ISSN 0028-0836), vol. 315, May 9, 1985, p. 124-126. NSF-supported research.

Astronomy and Astrophysics

Astronomy

86

Galactic Nuclei, Galactic Structure, Milky Way Galaxy, Radio Sources (Astronomy), Very Long Base Interferometry, Brightness Distribution, Diameters, Normal Density Functions

Scientific paper

The galactic center compact radio source Sgr A has been reobserved at 3.6 cm and 1.35 cm with many baselines, using the more sensitive receivers and VLBI recording terminals now available. These observations set an upper limit of 20 AU to the diameter of Sgr A at 1.35 cm and reveal for the first time an elongated structure at 3.6 cm, with the position angle of the long axis almost parallel to the rotation axis of the Galaxy. Sgr A is unique in the Galaxy, but resembles most closely the compact radio sources at the center of external galaxies. Observations of the central four arcsec at radio and other wavelengths are best explained by a single massive collapsed object at the galactic center.

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