Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasj...59..323t&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.59, No.2, pp.323-333
Astronomy and Astrophysics
Astronomy
11
Galaxy: Center
Scientific paper
We report on the results of molecular line observations toward the l=1°.3 complex, an anomalous cloud complex in the central molecular zone of the Galaxy. The CO J=3 2 survey recently performed with the Atacama Submillimeter Telescope Experiment (ASTE) 10 m telescope has found that the complex has an enhanced CO J=3 2/J=1 0 intensity ratio. We have made high-resolution maps of the CO J=1 0, HCN J=1 0, HCO+ J=1 0, SiO J=1 0, and J=2 1 lines with the Nobeyama 45 m telescope. The complex is found to be rich in shells and arcs of dense molecular gas. We identified 9 expanding shells in HCN maps and compact SiO features associated with the shells. The intensity ratios of HCN/CO, HCO+/CO, and CO J=3 2/J=1 0 are coherently enhanced by a factor of a few in gas with an LSR velocity higher than 110 kms-1. The high-velocity gas has a high density (nH ˜ 104.5 cm-3) and high SiO/13CO intensity ratio, indicating that the gas was shocked. The typical HCN/HCO+ intensity ratio is found to be 2.3, being higher by a factor of a few than those in the Galactic disk clouds. The typical kinetic energy and expansion time of the shells are estimated to be 1050.9-52.5 erg and 104.6-5.3 yr, respectively. The kinetic energy could be furnished by multiple supernova and/or hypernova explosions at a rate of 10-3 -4 yr-1. These estimates suggest that the expanding shells as a whole may be in the early stage of superbubble formation. This proto-superbubble may have originated in a massive cluster formation that took place 106.8 7.6 yr ago.
Kamegai Kazuhisa
Nagai Makoto
Oka Tomoharu
Tanaka Kunihiko
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