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Far 3 kpc Arm
The Far 3 kpc Arm was discovered in 2008 by astronomer Tom Dame (Harvard-Smithsonian CfA), while preparing a talk on the Galaxy's spiral arms for a meeting of the 212th American Astronomical Society. It's one of Milky Way's spiral arms and it's located in the first galactic quadrant at a distance of 3 kpc (about 10,000 ly) from the galactic center. Along with the Near 3 kpc Arm whose existence is known since the mid-1950s, the counterpart inner arms establish our Galaxy's simple symmetry.〔(The Far 3kpc Arm ) NASA/Astronomy Picture of the Day, 2008〕
Tom Dame and collaborator Patrick Thaddeus analyzed data obtained using a 1.2-meter-diameter millimeter-wave telescope located at Cerro Tololo Inter-American Observatory (CTIO) in Chile. They detected the presence of the spiral arm in a CO survey and later confirmed their discovery using 21-centimeter radio measurements of atomic hydrogen collected by colleagues in Australia.〔(Milky Way's Inner Beauty Revealed ), Press Release Harvard-Smithsonian Center for Astrophysics, 2008〕〔(A New Spiral Arm of the Galaxy: The Far 3-Kpc Arm ), T. M. Dame, P. Thaddeus, ApJ Letters, 2008〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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