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Disentangling the stellar populations of Fornax Dwarf Spheroidal


Cesetti, M and Held, EV and Gullieuszik, M and Rizzi, L and Battaglia, G and Cole, AA and Da Costa, G and Mateo, M and Olszewski, E and Tolstoy, E and Walker, M, Disentangling the stellar populations of Fornax Dwarf Spheroidal, Proceedings of CRAL2010: A Universe of Dwarf Galaxies, 14-18 June 2010, LYON, France, pp. 69-70. (2011) [Non Refereed Conference Paper]

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DOI: doi:10.1051/eas/1148014


We studied the stellar populations of Fornax dwarf spheroidal galaxy using HST/WFPC2 imaging of 7 galaxy fields. Our observations reach the oldest main-sequence turn-off, revealing distinct stars formation episodes and allowing us to address the evolution of this prototype dwarf spheroidal galaxy known to have experienced an extended history of star formation. From our HST data, spatial gradients in the stellar content of Fornax emerge with greater clarity. The outermost fields show only stars with ages between 712 Gyr, while the intermediate region hosts a stellar population between 410 Gyr, and stars younger of 2 Gyr are found in the innermost fields. A clearly visible gap in the subgiant branch points to bimodality in the main star formation episode. Our observations also indicate that the inner clump detected by Coleman et al. (2004) is characterized by the presence of young stars with age about 1.8 Gyr.

Item Details

Item Type:Non Refereed Conference Paper
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Cole, AA (Associate Professor Andrew Cole)
ID Code:71580
Year Published:2011
Web of Science® Times Cited:1
Deposited By:Physics
Deposited On:2011-07-22
Last Modified:2014-07-10

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