The Binary Galaxies NGC 147 And NGC 185

Details The Binary Galaxies NGC 147 And NGC 185 The Binary Galaxies NGC 147 And NGC 185

1998-07-08

arxiv.org/abs/astro-ph/9807083v2

Astronomy and Astrophysics

Astrophysics

To be published in A.J. October 1998

Scientific paper

10.1086/300576

Contrary to a previously published claim it is found that the spheroidal galaxies NGC 147 and NGC 185 probably form a stable binary system. Distance estimates place this pair on the near side of the Andromeda subgroup of the Local Group. The fact that this system has probably remained stable over a Hubble time suggests that it does not have a plunging orbit that brings it very close to M 31. It is noted that the only two Local Group galaxy pairs, in which the components have comparable masses, also have similar morphological types. NGC 147 and NGC 185 are both spheroidals, while the LMC and SMC are both irregulars. This suggests that protogalaxies of similar mass that are spawned in similar environments evolve into objects having similar morphologies.

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