List of Andromeda's satellite galaxies

The Andromeda galaxy M31 has exactly as our home galaxy, the Milky Way satellite galaxies also. Currently, at least 37 galaxies are known, including Andromeda, which together form the Andromeda subgroup of the Local Group. Among them are galaxies like the elliptical galaxy M32, which can be already identified with smaller amateur telescopes. The second brightest galaxy in its neighborhood is directly M110. NGC 185 was discovered on November 30, 1787 by William Herschel, the dwarf galaxy NGC 147 by his son John Frederick William Herschel on September 8, 1829.

The other galaxies are dwarf galaxies significantly fainter, and were only discovered by photographic and CCD images later.

Current measurement results from 2006 show now that the faint satellite galaxies Andomedas are in or near a plane through the center of their central galaxy. This unexpected result of the distribution raises several questions regarding the current approaches to the models of galaxy formation. In this case, the distribution plane in the direction of a nearby group of galaxies of the M81 group, which could possibly provide an indication of the large-scale distribution of dark matter.

Table of known satellites

The satellite of the Andromeda galaxy ordered by the year of their discovery.

Tidal stellar streams

Interaction with Andromeda

New images from the Spitzer Space Telescope NASA shed light on the past, violent evolution of Andromeda. They show that few million years ago broke through one of the satellite galaxies, the elliptical galaxy M32, one of the spiral arms of Andromeda. Infrared images were able to show on the one hand, that the two spiral arms and protruding through star formation ring are separate structures, on the other hand, this ring at its center has a hole where M32 broke through the disk of the Andromeda galaxy.

Galaxy types

  • DIm: Irregular dwarf galaxy ( dwarf irregular galaxy )
  • DSph: spheroids dwarf galaxy ( dwarf spheroidal galaxy )

More

  • List of satellite galaxies of the Milky Way
  • Local Group
Messier 32 Messier object Galaxy group Light-year Triangulum Galaxy Messier 110 Andromeda I Andromeda II Andromeda III Andromeda IV Pisces Dwarf Andromeda V Andromeda VIII Andromeda IX Andromeda X Andromeda XI
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