Radio structure at 8.4 GHz in Sagittarius A, the compact radio source at the Galactic center

Details Radio structure at 8.4 GHz in Sagittarius A, the compact radio source at the Galactic center Radio structure at 8.4 GHz in Sagittarius A, the compact radio source at the Galactic center

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98...44j&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, July 1989, p. 44-48. Research supported by the University of Sydney and Rothmans

Astronomy and Astrophysics

Astronomy

28

Galactic Nuclei, Milky Way Galaxy, Radio Sources (Astronomy), Sagittarius Constellation, Very Large Array (Vla), Anisotropic Media, Galactic Rotation, Line Of Sight

Scientific paper

VLBI observations of the compact, nonthermal radio source at the Galactic center show it to be elongated at 8.4 GHz along a position angle of 82 + or - 6 deg. The source has an axial ratio of 0.53 + or - 0.10 with a major axis of 17.4 + or - 0.5 mas. Examination of VLA maps of the Galactic center region indicate no obvious alignment with this smaller-scale elongation of the nuclear region, nor is the nuclear position angle aligned with the axis of Galactic rotation. Comparison with the size measured at frequencies from 1 to 22 GHz shows that the size follows very closely the lambda-squared dependence expected from interstellar scattering. The alongated nature of the source implies either that the scattering medium is anisotropic or that some remnant of the intrinsic structure remains visible through the scattering medium.

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