Multi-band Photometry of Globular Cluster Systems

Details Multi-band Photometry of Globular Cluster Systems Multi-band Photometry of Globular Cluster Systems

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910006k&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #100.06; Bulletin of the American Astronomical Society,

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It has been known through many studies that globular cluster (GC) systems are a powerful tool for probing the formation and evolution of their parent galaxies. Since the discovery of the bimodal color distributions of extragalactic GC systems, the origin of such phenomenon has been the topic of much interest and a source of ongoing debate (e.g., Brodie & Strader 2006). It is widely agreed that the presence of two distinct GC sub-populations with different metallicities is responsible for the observed color bimodality. Recently, however, an alternative explanation has been offered by Yoon, Yi & Lee (2006), in which the non-linear relation between metallicity and color gives rise to color bimodality, without invoking distinct GC sub-systems within individual galaxies. This scenario requires for the ratio of blue GCs to red ones in the color distribution to vary systematically depending on colors with different filter combination for the same sample. With the two distinct sub-populations present, on the other hand, the ratio will not change regardless of the bandpasses.
The predicted number ratio variation in multi-band was reproduced in modeling. Furthermore, the new hypothesis by Yoon et al. (2006) was partially verified in the observations of GC systems (e.g. Peng et al. 2006, Hempel et al. 2005). In order to shed light on the origin of color bimodality, multi-band observations with homogeneous dataset and wider field coverage on extended wavelength range is needed.

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