• Source: Sagittarius Dwarf Irregular Galaxy

The Sagittarius Dwarf Irregular Galaxy (SagDIG) is a dwarf galaxy in the constellation of Sagittarius. It lies about 3.4 million light-years away. It was discovered by Cesarsky et al. on a photographic plate taken for the ESO (B) Atlas on 13 June 1977 using the ESO 1 meter Schmidt telescope.
The SagDIG is thought to be the member of the Local Group most remote from the Local Group's barycenter. It is only slightly outside the zero-velocity surface of the Local Group.
SagDIG is a much more luminous galaxy than the Aquarius Dwarf and it has been through a prolonged period of star formation. This has resulted in it containing a rich intermediate-age population of stars. Twenty-seven candidate carbon stars have been identified inside SagDIG. Analysis shows that the underlying stellar population of SagDIG is metal-poor (at least [Fe/H] ≤ −1.3). Further, the population is young, with the most likely average age between 4 and 8 billion years for the dominant population.




References






External links



The Sagittarius Dwarf Irregular Galaxy on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Kata Kunci Pencarian:

• Daftar galaksi terdekat
• Sagittarius Dwarf Irregular Galaxy
• Sagittarius Dwarf Galaxy
• Dwarf galaxy
• Local Group
• Canis Major Overdensity
• Low surface brightness galaxy
• List of nearest galaxies
• Leo I (dwarf galaxy)
• Tucana Dwarf
• Interacting galaxy