High Frequency Measurements of the Spectrum of SGR A*

Details High Frequency Measurements of the Spectrum of SGR A* High Frequency Measurements of the Spectrum of SGR A*

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...490l..77s&link_type=abstract

Astrophysical Journal Letters v.490, p.L77

Astronomy and Astrophysics

Astronomy

71

Galaxies: Nuclei, Galaxy: Center

Scientific paper

We report near-simultaneous interferometric measurements of the spectrum of Sagittarius A* over the 5-354 GHz range and single-dish observations that have yielded the first detection of Sgr A* at 850 GHz. We confirm that Sgr A*'s spectrum rises more steeply at short millimeter wavelengths than at centimeter wavelengths, leading to a near-millimeter/submillimeter excess that dominates its luminosity. Below 900 GHz, Sgr A*'s observed luminosity is 70 +/- 30 L solar . A new upper limit to Sgr A*'s 24.3 mu m flux, together with a compilation of other extant IR data, imply a far-infrared spectral turnover, which can result from either an intrinsic synchrotron cutoff or excess extinction near Sgr A*. If the former applies, Sgr A*'s total synchrotron luminosity is <103 L solar , while in the latter case it is <3 x 104 L solar if spherical symmetry also applies.

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