Abstracts, Galactic Center Workshop '98
GCNEWS
A Newsletter for Galactic Center Research
This Volume was edited by Angela Cotera & Heino Falcke
email: gcnews@aoc.nrao.edu

ABSTRACT

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Flare of SgrA* at 100 GHz
Tsuboi, M.1; Miyazaki, A.1;Tsutsumi, T.2
1 Institute of Astrophysics and Planetary Science, Ibaraki University, 2-1 Bunkyo, Mito, 310-8512, Japan 2 National Astronomical Observatory, Mitaka, Tokyo, 181-8588, Japan
ABSTRACT:
We have performed 3 sets of one-month flux density monitoring of the
compact synchrotron source, Sgr A* at 100 GHz using the
Nobeyama Millimeter Array (NMA) in 1996-1998. The NMA
observations allow us to spatially separate Sgr A* from the
surrounding thermal component. All the observations were made with the
same array configuration. We detected a flare of Sgr A* in March
of 1998, although there is no such significant variability during
other observing months. The flux density of Sgr A* at 100 GHz
flared by 200% in a week and decreased to the mean flux
density within two weeks. No remakable change is seen in NRAO
monitoring data at 2 and 8 GHz during the flare. The rapid flux density
variability at mm wavelengths was observed previously but is still
controversial. The entire time profile of a flare is clearly displayed
in our data. Some implications of the results are discussed.
LINKS: Program, Author, tsuboi@masato.sci.ibaraki.ac.jp
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