Galactic Center Molecular Arms, Ring and Expanding Shells. II - Expanding Molecular Shell -
Abstract
We investigate the three-dimensional structure of the so-called ``200-pc expanding molecular ring" in the Galactic Center by analyzing (b, Vlsr) diagrams of the 13CO(J=1-0) line emission from the Bell-Telephone Laboratory survey. We show that the b-v features can be fitted by a spheroidal shell pinched at the equator (dumbbell-shaped shell), which we call the expanding molecular shell (EMS). The radius is about 180 pc and the vertical extent is more than +/-50 pc. The shell is expanding at 160 km/s, and is rotating at 70 km/s. The association of the radio continuum emission indicates that the EMS is a mixture of molecular and ionized hydrogen gases. An extended hot (X-ray) plasma appears to fill the interior of the shell. The estimated molecular mass of the shell is approximately 1.E7 Msun and its kinetic energy 2.E54 ergs.
Cite
@article{arxiv.astro-ph/9508111,
title = {Galactic Center Molecular Arms, Ring and Expanding Shells. II - Expanding Molecular Shell -},
author = {Yoshiaki Sofue},
journal= {arXiv preprint arXiv:astro-ph/9508111},
year = {2007}
}
Comments
To appear in PASJ vol.47, No.5, 1995, Plain TeX, Figures on request