Flux Density of Sagittarius A at lambda = 3 Millimeters

Details Flux Density of Sagittarius A at lambda = 3 Millimeters Flux Density of Sagittarius A at lambda = 3 Millimeters

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...417..560w&link_type=abstract

Astrophysical Journal v.417, p.560

Astronomy and Astrophysics

Astronomy

45

Galaxy: Center, Radio Continuum: Galaxies

Scientific paper

We have analyzed aperture synthesis observations of Sgr A at λ = 3 millimeters from 1985 to 1990. We find significant flux density variations from 0.8 to 2.3 Jy with timescales as short as ˜10 days. Spectra during the decay of a flare in 1990 show a turnover between 23 and 89 GHz. The variations may be associated with unstable accretion onto a black hole. The rapid flux density variations do not significantly degrade the 3 millimeter wavelength images but are a source of confusion for the determination of the spectrum of Sgr A*. The mean flux density of Sgr A* at 85-89 GHz is ˜1.1 Jy in 1985-86 and 1988-90.
There is a plume of emission extending 10" to the north of Sgr A* which is probably associated with the tail of IRS 7. The integrated flux density of 110 mJy is consistent with optically thick thermal and/or dust emission in the tail.
The integrated flux density within a 2' field at λ = 3 mm is 27 Jy from a combination of BIMA (Berkeley Illinois Maryland Association) and Nobeyama data. The previously reported nonthermal emission from this area at λ = 3 mm is probably the poorly sampled large-scale emission from a halo component which may or may not be associated with the Galactic center.

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