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The Far 3 kpc Arm was discovered in 2008 by astronomer Tom Dame (Center for Astrophysics | Harvard & Smithsonian), while preparing a talk on the galaxy's spiral arms for a meeting of the 212th American Astronomical Society. It is one of Milky Way's spiral arms 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 our Galaxy's simple symmetry.[1]

Artist's conception of the spiral structure of the Milky Way with two major stellar arms and a central bar. In this image the Far 3 kpc Arm is located near the center, above and to the left of the bulge.
Artist's conception of the spiral structure of the Milky Way with two major stellar arms and a central bar. In this image the Far 3 kpc Arm is located near the center, above and to the left of the bulge.

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



References


  1. Nemiroff, R.; Bonnell, J., eds. (11 July 2008). "The Far 3kpc Arm". Astronomy Picture of the Day. NASA.
  2. Milky Way's Inner Beauty Revealed, phys.org, June 3, 2008
  3. A New Spiral Arm of the Galaxy: The Far 3-Kpc Arm, T. M. Dame, P. Thaddeus, ApJ Letters, 2008



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