Dwarf Galaxies - Sagittarius Dwarf Elliptical Galaxy, Omega Centauri, Messier 32, Andromeda I, Dwarf Galaxy, Ngc 185, Virgo Stellar Stream (Paperback)

Chapters: Sagittarius Dwarf Elliptical Galaxy, Omega Centauri, Messier 32, Andromeda I, Dwarf Galaxy, Ngc 185, Virgo Stellar Stream, Messier 110, Dwarf Spheroidal Galaxy, Fornax Dwarf, Sculptor Dwarf Galaxy, Leo A, Cassiopeia Dwarf, Willman 1, Dwarf Spiral Galaxy, Carina Dwarf, List of Stellar Streams, Ursa Minor Dwarf, Sextans A, Sextans B, Ngc 1531, Tucana Dwarf, Arcturus Stream. Source: Wikipedia. Pages: 72. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: The Sagittarius Dwarf Elliptical Galaxy (SagDEG) is an elliptical loop-shaped satellite galaxy of the Milky Way Galaxy. The main cluster which, in 1994, was the first to be discovered, is roughly 10,000 light-years in diameter, and is currently about 70,000 light-years from Earth and travelling in a polar orbit at a distance of about 50,000 light-years from the core of the Milky Way (about 1/3 the distance of the Large Magellanic Cloud). Sag DEG should not be confused with Sag DIG, the Sagittarius Dwarf Irregular Galaxy, a small galaxy over four million light-years distant. Officially discovered in 1994, by Rodrigo Ibata, Mike Irwin, and Gerry Gilmore, Sag DEG was immediately recognized as being the nearest known neighbor to our Milky Way at the time. (Since 2003, the newly discovered Canis Major Dwarf Galaxy is considered the actual nearest neighbor.) Although it is one of the closest companion galaxies to the Milky Way, the main parent cluster is on the opposite side of the galactic core from Earth, and consequently is very faint, although it covers a large area of the sky. Sag DEG appears to be an older galaxy, with little interstellar dust and composed largely of Population II stars, older and metal-poor, as compared to the Milky Way. No neutral hydrogen gas related to SagDEG was found by Burton