The radio spectrum of the compact source at the galactic center

Details The radio spectrum of the compact source at the galactic center The radio spectrum of the compact source at the galactic center

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83.1594b&link_type=abstract

Astronomical Journal, vol. 83, Dec. 1978, p. 1594-1597. Research supported by the Miller Institute.

Astronomy and Astrophysics

Astronomy

12

Galactic Nuclei, Radiant Flux Density, Radio Astronomy, Radio Sources (Astronomy), Radio Spectra, Milky Way Galaxy, Radio Interferometers, Radio Scattering, Radio Stars, Stellar Magnetic Fields, Synchrotron Radiation, Very Long Base Interferometry

Scientific paper

Observations of the compact radio source at the Galactic center obtained at 11.1 and 3.7 cm with the Green Bank 35-km radio-link interferometer and at 6, 2, and 1.3 cm with the VLA reveal that the flux density of the source increases with increasing frequency for frequencies less than or about equal to 25 GHz. This result, taken in conjunction with recent VLBI observations which show Sgr A to be no more than 0.001 arcsec (10 AU), requires either that the magnetic field in the source is very high, greater than 200 G, or that the true source size is significantly smaller than the VLBI limits, about 2 AU, and hence that the energy density in the source is very large, greater than 15 erg/cu cm. An alternative to this description is provided by the similarity of the radio properties of Sgr A to those of Galactic radio stars in which the opacity at centimeter wavelengths is provided by free-free absorption. If this latter interpretation is applicable, the compact radio source at the Galactic center is likely to be associated with one member of a multiple-star system.

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