![](https://i0.wp.com/dimensionalbliss.org/wp-content/uploads/2015/03/nbc_ufo_conf_150224_e510bd8b9213812eb2b9d00a67d3bff73.jpg?fit=676%2C380&ssl=1)
Excerpt from nbcnews.com
By Katie Linendoll
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The Sculptor Galaxy |
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Artist’s impression of the Milky Way. Its hot halo appears to be stripping away the star-forming atomic hydrogen from its companion dwarf spheroidal galaxies. Image credit: NRAO/AUI/NSF |
"Astronomers wondered if, after billions of years of interaction, the nearby dwarf spheroidal galaxies have all the same star-forming ‘stuff’ that we find in more distant dwarf galaxies."
"What we found is that there is a clear break, a point near our home galaxy where dwarf galaxies are completely devoid of any traces of neutral atomic hydrogen."Bottom line: New observations by large radio telescopes reveal that within a well-defined boundary around our galaxy, dwarf galaxies are completely devoid of star-making hydrogen gas. Astronomers say our Milky Way is to blame.
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Neighboring galaxies to our own Milky Way (Descriptions below) |
NAME | DISTANCE (kpc) | DISCOVERY PAPER |
---|---|---|
Canes Major | 7.2 | Martin et al. 2004, A dwarf galaxy remnant in Canis Major: the fossil of an in-plane accretion on to the Milky Way |
Segue 3 | 17 | Belokurov et al. 2010, Big Fish, Little Fish: Two New Ultra-Faint Satellites of the Milky Way |
Segue 1 | 23 | Belokurov et al. 2007, Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions |
Sagittarius | 24 | Ibata, Gilmore & Irwin, 1994, A dwarf satellite galaxy in Sagittarius 1995, Sagittarius: the nearest dwarf galaxy |
Segue 2 | 34.7 | Belokurov et al. 2009, The discovery of Segue 2: a prototype of the population of satellitesof satellites |
Bootes II | 43 | Walsh, Jerjen & Willman, 2007, A Pair of Bootes: A New Milky Way Satellite |
Coma | 44 | Belokurov et al. 2007, Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions |
Willman 1 (SDSSJ1049+5103) | 45 | Willman et al. 2005, A New Milky Way Companion: Unusual Globular Cluster or Extreme Dwarf Satellite? |
Bootes III | 46 | Grillmair 2009, Four New Stellar Debris Streams in the Galactic Halo |
LMC | 50.8 | - |
SMC | 59.7 | - |
Bootes | 60 | Belokurov et al. 2006, A Faint New Milky Way Satellite in Bootes |
Ursa Minor | 66 | A.G. Wilson of the Lowell Observatory in 1955, Sculptor-Type Systems in the Local Group of Galaxies |
Sculptor (Scl) | 79 | discovered in 1938 by Harlow Shapley, A Stellar System of a New Type |
Draco | 82 | A.G. Wilson of the Lowell Observatory in 1955, Sculptor-Type Systems in the Local Group of Galaxies |
Sextans | 89 | Mike Irwin, M.T. Bridgeland, P.S. Bunclark and R.G. McMahon, 1990 A new satellite galaxy of the Milky Way in the constellation of Sextans |
Ursa Major (UMa) | 100 | Willman et al. 2005, A New Milky Way Dwarf Galaxy in Ursa Major |
Carina | 103 | Cannon, R. D., Hawarden, T. G., & Tritton, S. B., 1977, A new Sculptor-type dwarf elliptical galaxy in Carina |
Hercules | 140 | Belokurov et al. 2007, Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions |
Fornax | 140 | discovered in 1938 by Harlow Shapley, described in "Two Stellar Systems of a New Kind", Nature, Vol. 142, p. 715 |
Canes Venatici II | 150 | Sakamoto & Hasegawa 2006, Discovery of a Faint Old Stellar System at 150 kpc |
Leo IV | 160 | Belokurov et al. 2007, Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions |
Pisces II | 182 | Belokurov et al. 2010, Big Fish, Little Fish: Two New Ultra-Faint Satellites of The Milky Way |
Leo II (Leo B) | 208 | Robert G. Harrington and Albert George Wilson, 1950, Two New Stellar Systems in Leo |
Canes Venatici | 220 | Zucker et al. 2006 A New Milky Way Dwarf Satellite in Canes Venatici |
Leo I | 254 | Robert G. Harrington and Albert George Wilson, 1950, Two New Stellar Systems in Leo |
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November 20, 2011
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