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Molecular loops in the Galactic centre; evidence for magnetic floatation accelerating molecular gas

Published online by Cambridge University Press:  01 August 2006

H. Yamamoto
Affiliation:
Dep. of Astrophysics, Nagoya Univ., 464-8602, Japan
Y. Fukui
Affiliation:
Dep. of Astrophysics, Nagoya Univ., 464-8602, Japan
M. Fujishita
Affiliation:
Dep. of Astrophysics, Nagoya Univ., 464-8602, Japan
K. Torii
Affiliation:
Dep. of Astrophysics, Nagoya Univ., 464-8602, Japan
N. Kudo
Affiliation:
Dep. of Astrophysics, Nagoya Univ., 464-8602, Japan
S. Nozawa
Affiliation:
Dep. of Science, Ibaraki Univ., 310-8512, Japan
K. Takahashi
Affiliation:
NAOJ, 118-8588, Japan The Graduate Univ. for Advanced Studies, 240-0193, Japan
R. Matsumoto
Affiliation:
Dep. of Physics, Faculty of Science, Chiba Univ., 263-8522, Japan
M. Machida
Affiliation:
NAOJ, 118-8588, Japan
A. Kawamura
Affiliation:
Dep. of Astrophysics, Nagoya Univ., 464-8602, Japan
Y. Yonekura
Affiliation:
Dep. of Physics Science, Osaka Prefecture Univ., 599-8531, Japan
N. Mizuno
Affiliation:
Dep. of Astrophysics, Nagoya Univ., 464-8602, Japan
T. Onishi
Affiliation:
Dep. of Astrophysics, Nagoya Univ., 464-8602, Japan
A. Mizuno
Affiliation:
Solar-Terrestrial Environment Lab., Nagoya Univ., 464-8601, Japan E-mail: hiro@a.phys.nagoya-u.ac.jp
Corresponding
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Extract

The new molecular image obtained by NANTEN telescope in the galactic center has revealed the existence of the two loop like structures, loop 1 and loop 2, which have never been seen before toward l = 355° to 358°. The velocities of loop 1 and loop 2 are −180 to −90 km s−1 and −90 and −40 km s−1, respectively, and these two loops have strong velocity gradients. The foot points of the loops show a very broad linewidth of ~40 to 80 km s−1 whose large velocity spans are characteristic of the molecular gas near the galactic center. Therefore, we classified the loops as being located in the galactic center and adopt a distance of 8.5 kpc. Then, the projected lengths of loop 1 and loop 2 were estimated as ~500 and ~300 pc, respectively and velocity gradients corresponds to ~80 km s−1 per 250 pc along loop 1 and ~60 km s−1 per 150 pc along loop 2. The heights of these loops are also estimated as ~220 to ~300 pc from the galactic plane, significantly higher than the typical scale height in the nuclear disk.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007
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