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Disentangling the stellar populations of Fornax Dwarf Spheroidal

conference contribution
posted on 2023-05-23, 17:16 authored by Cesetti, M, Held, EV, Gullieuszik, M, Rizzi, L, Battaglia, G, Andrew ColeAndrew Cole, Da Costa, G, Mateo, M, Olszewski, E, Tolstoy, E, Walker, M
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 7–12 Gyr, while the intermediate region hosts a stellar population between 4–10 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.

History

Publication title

Proceedings of CRAL2010: A Universe of Dwarf Galaxies

Volume

48

Editors

M Koleva, P Prugniel and I Vauglin

Pagination

69-70

Department/School

School of Natural Sciences

Publisher

EDP Sciences

Event title

CRAL-2010: A Universe of Dwarf Galaxies

Event Venue

LYON, France

Date of Event (Start Date)

2010-06-14

Date of Event (End Date)

2010-06-18

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

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