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- W3105681688 abstract "The M 31 satellite galaxy M 32 has long been considered an object of unique properties, being the most extreme example of the very rare compact elliptical galaxy class. Here we present the spectroscopic discovery of two M 32 twins in the massive galaxy cluster Abell 1689. As these objects are so rare, this is an important step towards a better understanding of the nature of compact galaxies. The two M 32 twins had first been detected within our photometric search for ultra compact dwarf galaxy (UCDs) candidates in A1689 (Mieske et al. [CITE], AJ, 128, 1529) with the Advanced Camera for Surveys (ACS). Their luminosities ( mag) are very similar to M 32 and their surface brightness profiles are consistent with that of M 32 projected to A1689's distance. From our ACS imaging we detect several fainter compact galaxy candidates with luminosities intermediate between M 32 and the Fornax UCDs. If spectroscopically confirmed as cluster members, this would almost close the gap in the mag-μ plane between the region of UCDs and the compact ellipticals, implying a sequence of faint compact galaxies well separated from that of dwarf ellipticals." @default.
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- W3105681688 date "2005-01-20" @default.
- W3105681688 modified "2023-10-18" @default.
- W3105681688 title "Discovery of two M 32 twins in Abell 1689" @default.
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- W3105681688 doi "https://doi.org/10.1051/0004-6361:200400119" @default.
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