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Sky around the dwarf galaxy

A dwarf spheroidal galaxy, is a term in astronomy applied to low luminosity galaxies that are companions to the Milky Way and to the similar systems that are companions to the Andromeda Galaxy (M31). While similar to dwarf elliptical galaxies in appearance and properties such as little to no gas or dust or recent star formation, they are approximately spheroidal in shape, generally lower luminosity, and are recognized only as satellite galaxies in the Local Group.

While there were nine classical dSph galaxies discovered until 2005, the Sloan Digital Sky Survey has resulted in the discovery of 11 more dSph galaxies, this has radically changed the understanding of these galaxies by providing a much larger sample to study. By 2015, many more ultra faint dSph's were discovered, all satellites of the Milky Way.

This wide field view shows the sky around the dwarf galaxy IC 1613 in the constellation of Cetus (The Sea Monster). This picture was created from images forming part of the Digitized Sky Survey 2. The galaxy appears at the centre of the picture as an irregularly shaped clump of faint stars.

ESO/Digitized Sky Survey 2. Acknowledgement: Davide De Martin

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