Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924602y&link_type=abstract
American Astronomical Society, AAS Meeting #219, #246.02
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent spectroscopy of the nearest giant galaxy M31 (the Andromeda galaxy) with unprecedented precision witnessed a clear division of old globular clusters (GCs) in their spectral characteristics. The GC dichotomy in galaxies, so far asserted mainly by photometric color bimodality, is widely taken as the presence of two distinct metallicity subpopulations, and forms a critical backbone of various galaxy formation theories. However we find that, without having to invoke two separate GC subgroups, the spectroscopic division of M31 GCs emerges simply due to the highly nonlinear nature of their stellar mixtures as a function of metallicity. Our findings give a new insight into the structure of GC systems in galaxies, and could greatly simplify theories of galaxy formation.
Chung Chih-Ching
Kim Seongcheol
Yoon Suk-Jin
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