Anisotropy in the Angular Broadening of Sgr A$^*$ at the Galactic Center

Details Anisotropy in the Angular Broadening of Sgr A$^*$ at the Galactic Center Anisotropy in the Angular Broadening of Sgr A$^*$ at the Galactic Center

1993-12-17

arxiv.org/abs/astro-ph/9312040v1

Astronomy and Astrophysics

Astrophysics

11 TeX pages, one postscript figure upon request, NWU-12-93-15

Scientific paper

We present the results of a $\lambda$20 cm VLA observation of the compact Galactic center radio source Sgr A$^*$. The scatter-broadened image is elongated in the East-West direction, with an axial ratio of 0.6$\pm$0.05 and a position angle of 87$^0\pm$3$^0$. A similar shape and orientation has been found previously at shorter wavelengths using VLBI and VLBA. Both the major and minor axes follow the $\lambda^2$ law appropriate for scattering by turbulence in the intervening medium. Assuming that the anisotropy is caused by a magnetic field permeating the scattering medium, we argue that the scattering occurs within extended HII regions lying in the central 100 pc of the Galaxy. The magnetic field in this region must be poloidal, organized and is estimated to have a strength of at least 30 to 100 $\mu$Gauss.

Affiliated with

Also associated with

No associations

Rating

Anisotropy in the Angular Broadening of Sgr A$^*$ at 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 Anisotropy in the Angular Broadening of Sgr A$^*$ at the Galactic Center, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anisotropy in the Angular Broadening of Sgr A$^*$ at the Galactic Center will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-437659