Centaurus A/M83 Group
The M83 group is one of the Local Group of neighboring galaxies group that extends across the constellations Hydra, Centaur and Jungfrau. The group is divided into two subgroups: the NGC 5128 sub- group which is a distance of 12 million light-years (3.7 Mpc ), and in the center of the radio galaxy Centaurus A ( NGC 5128 ) is located, as well as the M83 subgroup that about 15 million light-years (4.6 Mpc ) is removed and grouped around the Southern Pinwheel Galaxy M83.
Some sources list both subgroups of a common group, while others describe both as individual groups of galaxies, so that is then spoken of the NGC 5128 Group and the M83 group. The almost seamless transition from one to the other sub-group and the almost vanishing relative movement of the two parts to each other, however, justify the description as a single group. The M83 group is similar in this feature of our Local Group, which also falls into two broad dynamamische subgroups. The distance between the two main galaxies M83 and NGC 5128, however, with about 4.5 million light-years greater than the distance to the Andromeda galaxy to the Milky Way. The masses of the two subgroups were estimated using the virial theorem to 1.1 × 1012 M ☉ ( M83 ) and 4.9 × 1012 M ☉ (NGC 5128 ). The total mass of the group is then about three times as large as the mass of the Local Group of about 6 × 1012 M ☉.
Members of the M83 group
Identification of members
The brightest members of the group were identified at an early galaxy surveys. However, many dwarf galaxies could be assigned only by modern intensive studies of the group. One of the first of these studies with the UKST at the Anglo - Australian Observatory detected 145 faint objects in the pictures, then both the 21cm line ( with the Parkes radio telescope ) and in the H -alpha light with the Siding Spring - 2.3 m telescope of the Australian National University were examined. So finally able 20 dwarf galaxies are detected as members of the group. The HIPASS - screening identified five further already cataloged galaxies as members. Another dwarf galaxy was found within the HIDEEP - screening, 20 additional candidates were found by a variety of other studies.
Membership lists
The following two tables list the members of the two subgroups of the M83 group, the. Karachentsev ID of et al were specified.
Furthermore, ESO 219-010, PGC 39032 and PGC 51659 mentioned as possible members of NGC 5128 sub-group, ESO 381-018, NGC 5408 and PGC 43048 as potential members of the M83.Untergruppe. Although HIPASS J1337 -39 is only listed as a member of the M83 subgroup, recent studies have strongly supported this assumption.