Far 3 kpc Arm
Minor arm near the center of the Milky Way Galaxy
The Far 3 kpc Arm was discovered in 2008 by astronomer Tom Dame while preparing a talk on the galaxy's spiral arms for a meeting of the 212th American Astronomical Society. It is one of the spiral arms of the Milky Way and it is located in the first galactic quadrant at a distance of 3 kiloparsecs (9,800 light-years) from the Galactic Center. Along with the Near 3 kpc Arm, the existence of which has been known since the mid-1950s, the counterpart inner arms establish the symmetry of the Milky Way.[1]
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.[2][3]
See also
- Galactic disc
References
- ^ Nemiroff, R.; Bonnell, J., eds. (11 July 2008). "The Far 3kpc Arm". Astronomy Picture of the Day. NASA.
- ^ Milky Way's Inner Beauty Revealed, phys.org, June 3, 2008
- ^ A New Spiral Arm of the Galaxy: The Far 3-Kpc Arm, T. M. Dame, P. Thaddeus, ApJ Letters, 2008
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