Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21912304s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #123.04
Mathematics
Logic
Scientific paper
Star clusters provide a unique and powerful tool for studying the star formation histories of galaxies. In particular, the ages and metallicities of star clusters bear the imprint of the galaxy formation process. M33 is the only nearby late-type spiral galaxy and provides a notable connection between the cluster populations of earlier-type spirals, and the numerous nearby later-type dwarf galaxies. I have carried out a comprehensive study of the M33 star cluster system, including deep photometry as well as high signal-to-noise spectroscopy. I have undertaken a photometric survey for extended sources in a 1deg x 1deg area centered on M33 using the MegaCam camera on the 3.6m Canada-France-Hawaii Telescope. This study mitigates the incompleteness present in the current catalogs of star clusters in M33, especially in the outskirts of this galaxy. I will discuss here the photometric properties of the sample, including color-color diagrams of 599 new candidate stellar clusters, and 204 confirmed clusters. Analysis of the radial density distribution suggests that the cluster system of M33 has suffered from significant depletion, possibly due to interactions with M31. Additionally, I will present the morphological properties of 161 star clusters in M33 using ACS/HST images. I found that the position angles of the M33 clusters show a bimodality with a strong peak perpendicular to the position angle of the galaxy. This evidence supports tidal forces as the reason for cluster elongation. Finally, I will present high-precision velocity measures of a variety of M33 star clusters, based on observations from the 10.4m Gran Telescopio Canarias and 3.6m William Herschel Telescope.
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