Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..779o&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.53, No. 5, pp.779-786
Astronomy and Astrophysics
Astronomy
17
Galaxies: Nuclei, Galaxy: Center, Ism: Clouds, Ism: Molecules
Scientific paper
Large-scale CO images taken with the 2×2 focal-plane array receiver on the 45m telescope of Nobeyama Radio Observatory reveal parsec-scale structure of molecular gas around the Galactic center radio arc. The LVG analysis shows that the gas kinetic temperature is considerably enhanced (Tk>=70K) in CO 0.13-0.13, a cloud which seems to be in contact with the nonthermal filaments of the Galactic center radio arc. This lends support for an interaction between CO 0.13-0.13 and the nonthermal filaments. The interaction with the strong magnetic field in and around the nonthermal filaments may heat up the molecular gas in CO 0.13-0.13 through shock dissipation and/or magnetic viscosity. We also find an expanding cavity adjacent to the nonthermal filaments. The shell has a radius of ~ 5 pc and an expansion velocity of 25 km s-1. This expanding cavity might have been formed by several hundred supernovae or a single hypernova within 3 × 155yr. Magnetic tubes in this region could have been swept up by the expanding cavity, and compressed by interactions with CO 0.13-0.13. An interaction between the cloud and magnetic field may accelerate electrons to relativistic energies through shock acceleration or magnetic field reconnection.
Hasegawa Tetsuo
Miyazaki Atsushi
Oka Tomoharu
Sato Fumio
Tsuboi Masato
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