Tucana Dwarf

The Tucana dwarf galaxy is a dwarf spheroidal galaxy in the constellation of the Toucan and was in 1990 by RJ Lavery discovered by the Mount Stromlo Observatory.

It consists of very old stars and is relatively isolated from other galaxies of the Local Group. The position on the opposite side of the Milky Way seen from other galaxies of the Local Group of makes them an important object of study of astronomy.

Properties

Classification

The Tucana Dwarf Galaxy is a spheroidal dwarf galaxy of type DE5. It contains only one generation of old stars that formed in a single phase, at the time when the globular clusters of the Milky Way have formed in about. It is currently, in contrast to other isolated dwarf galaxies to determine any star formation in Tucana dwarf galaxy.

Composition

The galaxy contains little neutral hydrogen gas. It has a significantly low metallicity of only -1.8. The metallicity shows only relatively small scattered measured values ​​distributed over the entire dwarf galaxy. Moreover, hardly any substructures in the stellar distribution can be observed.

Coordinates

The Tucana dwarf galaxy located at a distance of about 889 kpc to our solar system and away from our sun at a speed of about 194 km / s It is isolated from other galaxies of the Local Group and is located at the edge. The situation seen from other galaxies of the Local Group on the opposite side of the Milky Way, making it a valuable object in order to understand themselves better on the one hand, the kinematics and history of the Local Group, on the other hand, the dependencies of the local conditions to explore the galaxy evolution.

The galaxy is one of the few spheroidal dwarfs of the Local Group, which does not either the Milky Way or the Andromeda galaxy are close, so it was probably isolated over the entire period of their development time.