Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...462..768u&link_type=abstract
Astrophysical Journal v.462, p.768
Astronomy and Astrophysics
Astronomy
19
Galaxy: Center, Ism: H Ii Regions, Ism: Individual Alphanumeric: G359.1-0.2, Radio Lines: Ism
Scientific paper
We report the discovery of an H II region/molecular cloud complex toward the northern extreme of the Galactic center nonthermal filament G359. 1-0.2, also known as the "Snake." The 12CO and 13CO molecular emission, observed with the 10.4 m antenna of the Caltech Submillimeter Observatory, arises from several massive clumps situated near one end of the Snake and surrounding the H II complex. The high velocities (- 180 to - 100 km s-1) and large line widths (25-50 km s-1) of the molecular emission are characteristic of gas within the Galactic center region. Moreover, the systematically arranged velocities of the individual molecular clumps imply that they belong to a common kinematic system.
Association between the cloud, the filament, and the H II region is suggested by the data. An anti- correlation between the filament and the molecular emission, where the filament is superposed on the cloud, is attributed to interaction between the two. The H79cc recombination line, observed with the 100 m Effelsberg antenna toward the H II complex, is centered at a velocity (-180 km s-1) similar to that of the surrounding molecular gas.
By revealing a candidate energy source for one of the nonthermal Galactic center radio filaments, this study provides support for the hypothesis that these filaments are manifestations of strong vertical field lines (of mG strength) illuminated by the magnetohydrodynamic response to a collision with a magnetized molecular cloud. According to this hypothesis, reconnection of magnetic field lines at an ionized cloud surface is responsible for acceleration of electrons to relativistic velocities along the filament. Ionization of the cloud by a centrally located stellar source provides a copious supply of free electrons. While the requisite elements of this mechanism are in evidence at one end of G359. 1-0.2, the details of the hypothesized interaction have yet to be confirmed.
Guesten Rolf
Morris Mark
Serabyn Eugen
Uchida Keven Isao
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