Subject: GCFLASH - Vol. 6, No. 11 (Oct 29, 1997)

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                              G C N E W S
                             * Newsflash *

            - The Newsletter for Galactic Center Research -

gcnews@astro.umd.edu                    http://www.astro.umd.edu/~gcnews
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Vol. 6, No. 11                                              Oct 29, 1997

The next issue of the newsletter is a little bit delayed due to a 
little hard disk crash, but we will recover soon ...

Recently submitted papers:
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Email    : SERABYN@tacos.caltech.edu
Title    : High Frequency Measurements of the Spectrum of Sgr A*
Author(s): E. Serabyn(1,2), J. E. Carlstrom(3), O. Lay(4), D. C. 
           Lis(1),   T. R. Hunter(5), J. H. Lacy(2,6), and R. E. 
           Hills(7)
Paper    : ApJ Letters, Vol. 490, Nov. 20
Weblink  : http://www.journals.uchicago.edu/ApJ/journal/articles/ApJL/v4
           90n1/975502/sc0.html

Abstract:
We report near-simultaneous interferometric measurements of the
spectrum of Sgr A* over the 5 to 354 GHz range, and single-dish
observations which have yielded the first detection of Sgr A* at 850
GHz. We confirm that Sgr A*'s spectrum rises more steeply at short mm
wavelengths than at cm wavelengths, leading to a
near-millimeter/submillimeter excess which dominates its
luminosity. Below 900 GHz, Sgr A*'s observed luminosity is 70 +/- 30
L_o. A new upper limit to Sgr A*'s 24.3 micron flux, together with a
compilation of other extant IR data, imply a FIR spectral turnover,
which can result either from an intrinsic synchrotron cutoff, or
excess extinction near Sgr A^*. If the former applies, Sgr A*'s total
synchrotron luminosity is < 10^3 L_o, while in the latter case it is
<3 * 10^4 L_o if spherical symmetry also applies.
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			       Edited by
Angela Cotera                                 Heino Falcke
(cotera@ipac.caltech.edu)                    (hfalcke@astro.umd.edu)
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