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

[Home]
[New Abstracts]
[Newsletter]
[Newsflash]
[Articles]
[Conferences]
[Subscribers]
[Subscription]
[Submission]
OH 1720 MHz masers at the Galactic Centre
Wardle, M.1; Yusef-Zadeh, F.2; Geballe, T.R.3
1University of Sydney 2Northwestern University 3Joint Astronomy Center
ABSTRACT:
OH(1720 MHz) masers unaccompanied by 1665/7 MHz line masers have recently
been proposed as indicators of the interaction of supernova remnants
(SNRs) and molecular clouds. We present a model for the masing region
in which water produced in a C-type shock wave driven into the
molecular cloud is dissociated as a result of the X-ray flux from the
SNR.
We discuss the interaction of Sgr A East, a SNR
candidate, with the 50 km/s cloud at the Galactic Centre and present
near-infrared observations of H2 emission towards the regions
where OH(1720 MHz) maser emission is concentrated. The magnetic field
strength obtained from earlier Zeeman measurements is
consistent with rough pressure equilibrium between the postshock gas
and the X-ray gas filling Sgr A East detected by ASCA. Further, the
intensity of the v=1-0 S(1) line of H2 is consistent with the
shock strength expected to be driven into the molecular gas by this
pressure.
LINKS: Program, Author, wardle@physics.usyd.edu.au
[Home]
[New Abstracts]
[Newsletter]
[Newsflash]
[Articles]
[Conferences]
[Subscribers]
[Subscription]
[Submission]
Credits:
- Editors of this Volume: Angela Cotera & Heino Falcke
- The GCNEWS Logo
at the top of this page shows a 20cm radio map of the GC (Sgr A) made by Yusef-Zadeh & Morris.
- The GCNEWS newsletters, newsflashes and web pages are based on scripts originally developed by
Heino Falcke.
- Internet access for GCNEWS is currently sponsored by the
National Radio Astronomy Observatory in Socorro NM/USA.
Page currently maintained by
L. O. Sjouwerman.
File last modified on Monday 04 August 2003 [10:43 MDT].
[Home]
[New Abstracts]
[Newsletter]
[Newsflash]
[Articles]
[Conferences]
[Subscribers]
[Subscription]
[Submission]