Abstract
This paper reports the discovery of a helical molecular cloud in the central molecular zone (CMZ) of our Galaxy. This "pigtail" molecular cloud appears at (l, b, V LSR) ≃ (-0°7, + 0°.0, - 70 to -30kms-1), with a spatial size of ∼20 × 20 pc2 and a mass of (2-6) × 105 M⊙. This is the third helical gaseous nebula found in the Galactic center region to date. Line intensity ratios indicate that the pigtail molecular cloud has slightly higher temperature and/or density than the other normal clouds in the CMZ. We also found a high-velocity wing emission near the footpoint of this cloud. We propose a formation model of the pigtail molecular cloud. It might be associated with a magnetic tube that is twisted and coiled because of the interaction between clouds in the innermost x 1 orbit and ones in the outermost x 2 orbit.
| Original language | English |
|---|---|
| Article number | 87 |
| Journal | Astrophysical Journal |
| Volume | 756 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2012 Sep 1 |
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Keywords
- galaxies: ISM
- galaxies: magnetic fields
- Galaxy: center
- ISM: clouds
ASJC Scopus subject areas
- Space and Planetary Science
- Astronomy and Astrophysics
Cite this
Discovery of the pigtail molecular cloud in the galactic center. / Matsumura, Shinji; Oka, Tomoharu; Tanaka, Kunihiko; Nagai, Makoto; Kamegai, Kazuhisa; Hasegawa, Tetsuo.
In: Astrophysical Journal, Vol. 756, No. 1, 87, 01.09.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Discovery of the pigtail molecular cloud in the galactic center
AU - Matsumura, Shinji
AU - Oka, Tomoharu
AU - Tanaka, Kunihiko
AU - Nagai, Makoto
AU - Kamegai, Kazuhisa
AU - Hasegawa, Tetsuo
PY - 2012/9/1
Y1 - 2012/9/1
N2 - This paper reports the discovery of a helical molecular cloud in the central molecular zone (CMZ) of our Galaxy. This "pigtail" molecular cloud appears at (l, b, V LSR) ≃ (-0°7, + 0°.0, - 70 to -30kms-1), with a spatial size of ∼20 × 20 pc2 and a mass of (2-6) × 105 M⊙. This is the third helical gaseous nebula found in the Galactic center region to date. Line intensity ratios indicate that the pigtail molecular cloud has slightly higher temperature and/or density than the other normal clouds in the CMZ. We also found a high-velocity wing emission near the footpoint of this cloud. We propose a formation model of the pigtail molecular cloud. It might be associated with a magnetic tube that is twisted and coiled because of the interaction between clouds in the innermost x 1 orbit and ones in the outermost x 2 orbit.
AB - This paper reports the discovery of a helical molecular cloud in the central molecular zone (CMZ) of our Galaxy. This "pigtail" molecular cloud appears at (l, b, V LSR) ≃ (-0°7, + 0°.0, - 70 to -30kms-1), with a spatial size of ∼20 × 20 pc2 and a mass of (2-6) × 105 M⊙. This is the third helical gaseous nebula found in the Galactic center region to date. Line intensity ratios indicate that the pigtail molecular cloud has slightly higher temperature and/or density than the other normal clouds in the CMZ. We also found a high-velocity wing emission near the footpoint of this cloud. We propose a formation model of the pigtail molecular cloud. It might be associated with a magnetic tube that is twisted and coiled because of the interaction between clouds in the innermost x 1 orbit and ones in the outermost x 2 orbit.
KW - galaxies: ISM
KW - galaxies: magnetic fields
KW - Galaxy: center
KW - ISM: clouds
UR - http://www.scopus.com/inward/record.url?scp=84865595843&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84865595843&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/756/1/87
DO - 10.1088/0004-637X/756/1/87
M3 - Article
AN - SCOPUS:84865595843
VL - 756
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 87
ER -