Segue 1

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Galaxy
Segue 1
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AladinLite
Constellation lion
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 10 h 07 m 04 s
declination 16 ° 04 ′ 55 ″
Appearance
Morphological type dSph or GC  
Brightness  (B-band) 13.8 ± 0.5 mag
Physical data
Affiliation Local group  
distance 75,000 ± 6,500 ly /
23,000 ± 2,000 pc
history
Catalog names

Segue 1 is a small dwarf galaxy orbiting the Milky Way , possibly also a globular cluster .

Although Segue 1 has only a few visible stars , it exerts a thousand times stronger gravity and thus has a thousand times higher mass than its luminosity would suggest. It is therefore one of the most extreme examples of galaxy with dark matter .

The galaxy is one of many nearly invisible galaxies discovered in the Sloan Digital Sky Survey . These galaxies contain about 100 to 1000 times as much dark matter as visible matter. In contrast, the Milky Way contains about ten times as much dark matter as visible matter.

additional

Individual evidence

  1. ↑ a b SIMBAD Astronomical Database . In: Results for NAME SEGUE 1 . Retrieved March 13, 2010.
  2. ↑ a b c V. Belokurov, Zucker, DB; Evans, NW et al. : Cats and Dogs, Hair and a Hero: A Quintet of New Milky Way Companions . In: The Astrophysical Journal . 654, 2007, pp. 897-906. arxiv : astro-ph / 0608448 . bibcode : 2007ApJ ... 654..897B . doi : 10.1086 / 509718 .
  3. ↑ Nearby Galaxy Nearly Invisible , Space.com
  4. ↑ Astronomers Find a Galaxy Stuffed With Dark Matter . In: Discover Magazine Blogs , September 19, 2008. Retrieved September 22, 2008.