期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 360, 期 3, 页码 1007-1012出版社
BLACKWELL PUBLISHING
DOI: 10.1111/j.1365-2966.2005.09086.x
关键词
galaxies : individual : M31; galaxies : star clusters : galaxies
We present three new clusters discovered in the halo of M31 which, although having globular-like colours and luminosities, have unusually large half-light radii, similar to 30 pc. They lie at projected galactocentric distances of approximate to 15 to approximate to 35 kpc. These objects begin to fill the gap in parameter space between globular clusters and dwarf spheroidals, and are unlike any clusters found in the Milky Way, or elsewhere to date. Colour-magnitude diagrams, integrated photometric properties and derived King profile fit parameters are given, and we discuss possible origins of these clusters and their relationships to other populations.
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