Galactic Center Molecular Arms, Ring and Expanding Shells. II - Expanding Molecular Shell -

Yoshiaki Sofue

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arXiv · astro-ph/9508111

Galactic Center Molecular Arms, Ring and Expanding Shells. II - Expanding Molecular Shell -

Yoshiaki Sofue

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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.

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Yoshiaki Sofue. 1995-08-24. Galactic Center Molecular Arms, Ring and Expanding Shells. II - Expanding Molecular Shell -. https://arxiv.org/abs/astro-ph/9508111

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