Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546334k&link_type=abstract
American Astronomical Society, AAS Meeting #215, #463.34; Bulletin of the American Astronomical Society, Vol. 36, p.1116
Astronomy and Astrophysics
Astronomy
Scientific paper
We investigate the sizes of stellar groupings in the nearby face-on spiral galaxy M83, using the Early Release Science (ERS) images from the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3). The currently available WFC3 data for M83 provides one pointing of the nuclear region of the galaxy and the Eastern spiral arm, in a range of wavelengths from ultraviolet to near-infrared, and at a high enough resolution ( 0.8 pc/pixel) to discern individual stars. The size distribution of stellar groupings in this region is measured, in sizes ranging from stellar complexes ( 200+ pc) to compact clusters ( 3 pc), as well as their spatial distribution within the galaxy. To select stellar groups of various sizes, we re-bin the images to different pixel scales and utilize the DAOPHOT FIND routine on these re-binned images. The nature of clustering in M83 is assessed in light of these results, in order to determine if there are preferred scales of clustering or if stars cluster continuously on all size scales. This project is based on Early Release Science observations made by the WFC3 Scientific Oversight Committee. We are grateful to the Director of the Space Telescope Science Institute for awarding Director's Discretionary time for this program. Support for program #11360 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA
contract NAS 5-26555.
Calzetti Daniela
Chandar Rupali
Kaleida Catherine C.
Kim Hungsoo
WFC3 SOC Team
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