High-resolution Observations of OH(1720 MHz) Masers Toward the Galactic Center

Details High-resolution Observations of OH(1720 MHz) Masers Toward the Galactic Center High-resolution Observations of OH(1720 MHz) Masers Toward the Galactic Center

1998-09-22

arxiv.org/abs/astro-ph/9809279v1

Astronomy and Astrophysics

Astrophysics

13 pages, 2 Tables and 2 figures, to be published in ApJ

Scientific paper

10.1086/306769

High-resolution VLA observations of 1720 MHz OH maser emission from Sgr A East and the circumnuclear disk with spatial and spectral resolutions of $\approx$ 2\dasec5 $\times$ 1\dasec3 and 0.27 \kms are reported. This follow-up observational study focuses on the recent discovery of a number of such OH maser features and their intense circularly polarized maser lines detected toward these Galactic center sources. The 1720 MHz maser line of OH arises from collisionally excited gas behind a C-type shock and is an important diagnostic of the interaction process that may occur between molecular clouds and associated X-ray emitting shell-type supernova remnants. The present observations have confirmed that the observed Stokes $V$ signal is due to Zeeman splitting and that the OH masers are angularly broadened by the scattering medium toward the Galactic center. The scale length of the magnetic field fluctuations in the scattering medium toward the Galactic center is estimated to be greater than 0.1-0.2 pc using the correlation of the position angles of the scatter-broadened maser spots. In addition, the kinematics of the maser spots associated with Sgr A East are used to place a 5 pc displacement between this extended radio structure and the Galactic center.

Affiliated with

Also associated with

No associations

Rating

High-resolution Observations of OH(1720 MHz) Masers Toward the Galactic Center does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High-resolution Observations of OH(1720 MHz) Masers Toward the Galactic Center, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-resolution Observations of OH(1720 MHz) Masers Toward the Galactic Center will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-193932