GCNEWS
A Newsletter for Galactic Center Research
Currently edited by Sera Markoff, Loránt Sjouwerman, Joseph Lazio, Cornelia Lang, Rainer Schödel, Masaaki Sakano & Feng Yuan
email: gcnews@aoc.nrao.edu
GCNEWS
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% http://www.aoc.nrao.edu/staff/hfalcke/publications.html#campaign
% astro-ph/9801085
\documentstyle[apjfonts,emulateapj]{article}
\begin{document}
\title{The simultaneous spectrum of Sgr A* from $\lambda$20cm to
$\lambda$1mm and the nature of the mm-excess}
\author{Heino Falcke\altaffilmark{1,2}, W.M.~Goss\altaffilmark{3},
Hiroshi Matsuo\altaffilmark{4}, Peter~Teuben\altaffilmark{1},
Jun-Hui~Zhao\altaffilmark{5}, Robert~Zylka\altaffilmark{6}}
\altaffiltext{1}{Astronomy Department, University of Maryland, College Park, MD
20742-2421 (hfalcke,teuben@astro.umd.edu)}
\altaffiltext{2}{Current Address: Max-Planck-Institut f\"ur
Radioastronomie, Auf dem H\"ugel 69, D-53121 Bonn, Germany (hfalcke@mpifr-bonn.mpg.de)}
\altaffiltext{3}{NRAO, P.O. Box O, Socorro, NM 87801-0387 (mgoss@nrao.edu)}
\altaffiltext{4}{Nobeyama Radio Observatory, Minamimaki, Minamisaku,
Nagano 384-13, Japan (matsuo@nro.nao.ac.jp)}
\altaffiltext{5}{Center for Astrophysics, 60 Garden Street, Cambridge,
MA 02138 (jzhao@cfa.harvard.edu)}
\altaffiltext{6}{Institut f\"ur Theoretische Astrophysik, Tiergartenstra\ss{}e
15, D-69121 Heidelberg, Germany (rzylka@ita.uni-heidelberg.de)}
\begin{abstract}
We report results from a multiwavelength campaign to measure the
simultaneous spectrum of the super-massive black hole candidate Sgr A*
in the Galactic Center from cm to mm-wavelengths using the VLA, BIMA,
the Nobeyama 45m, and the IRAM 30m telescopes. The observations confirm
that the previously detected mm-excess is an intrinsic feature of the
spectrum of Sgr~A*. The excess can be interpreted as due to the
presence of an ultra-compact component of relativistic plasma with a
size of a few Schwarzschild radii near the black hole. If so, Sgr~A*
might offer the unique possibility to image the putative black hole
against the background of this component with future mm-VLBI
experiments.
\end{abstract}
\keywords{galaxies: nuclei---Galaxy: Center---black hole physics}
\section{Introduction}
It is now almost certain that the Galaxy hosts a dark mass of
$2.6\cdot10^6M_\odot$ in its very center. This has been demonstrated
most convincingly by high-resolution near-infrared speckle imaging of
the central star cluster (Eckart \& Genzel 1996) where proper motions
....