We present VLT-FORS1 color-magnitude diagrams (CMDs) reaching the oldest main-sequence turnoffs for three fields at two galactocentric distances in the Fornax dSph galaxy. We derive the star formation history (SFH) for each field through comparison with synthetic CMDs and show that the main epoch of star formation has extended to more recent epochs toward the center of the galaxy. A small burst of star formation about 2 Gyr ago is a robust feature in the SFH of all fields. It might be related to the shell structure found in Fornax by Coleman et al. (2004), which in turn has been interpreted as the relic of a merger event that occurred in Fornax about 2 Gyr ago. © 2005 International Astronomical Union.

Gallart, C., Aparicio, A., Zinn, R., Buonanno, R., Hardy, E., Marconi, G. (2005). The star formation history of the Fornax dSph galaxy using the new synthetic color-magnitude diagram code IAC-STAR, 1, 25-29 [10.1017/S174392130500342X].

The star formation history of the Fornax dSph galaxy using the new synthetic color-magnitude diagram code IAC-STAR

BUONANNO, ROBERTO;
2005

Abstract

We present VLT-FORS1 color-magnitude diagrams (CMDs) reaching the oldest main-sequence turnoffs for three fields at two galactocentric distances in the Fornax dSph galaxy. We derive the star formation history (SFH) for each field through comparison with synthetic CMDs and show that the main epoch of star formation has extended to more recent epochs toward the center of the galaxy. A small burst of star formation about 2 Gyr ago is a robust feature in the SFH of all fields. It might be related to the shell structure found in Fornax by Coleman et al. (2004), which in turn has been interpreted as the relic of a merger event that occurred in Fornax about 2 Gyr ago. © 2005 International Astronomical Union.
Pubblicato
Rilevanza internazionale
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Sì, ma tipo non specificato
Settore FIS/05 - Astronomia e Astrofisica
English
Con Impact Factor ISI
Gallart, C., Aparicio, A., Zinn, R., Buonanno, R., Hardy, E., Marconi, G. (2005). The star formation history of the Fornax dSph galaxy using the new synthetic color-magnitude diagram code IAC-STAR, 1, 25-29 [10.1017/S174392130500342X].
Gallart, C; Aparicio, A; Zinn, R; Buonanno, R; Hardy, E; Marconi, G
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/25699
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