Sagittarius Dwarf Irregular Galaxy


The Sagittarius Dwarf Irregular Galaxy 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 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 Aquarius Dwarf and it has been through a prolonged star formation This has resulted in it containing a rich intermediate-age population of stars. Twenty-seven candidate have been identified inside SagDIG. Analysis shows that the underlying stellar population of SagDIG is metal-poor. Further, the population is young, with the most likely average age between 4 and 8 billion years for the dominant population.

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