NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-16 T21:48:45 PDT
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For refcode 2009A&A...502L...9M:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2009A&A...502L...9M The young stellar population at the center of NGC 205 Monaco, L.; Saviane, I.; Perina, S.; Bellazzini, M.; Buzzoni, A.; Federici, L.; Fusi Pecci, F.; Galleti, S. Abstract. Context: NGC 205 is a peculiar dwarf elliptical galaxy hosting in its center a population of young blue stars. Their origin is still matter of debate, the central fresh star formation activity possibly being related to dynamical interactions between NGC 205 and M 31. Aims: The star formation history in the central 30" (~120 pc) around the NGC 205 central nucleus is investigated in order to obtain clues to the origin of the young stellar population. Methods: Deep HST/ACS CCD photometry is compared with theoretical isochrones and luminosity functions to characterize the stellar content of the region under study and compute the recent SF rate. Results: Our photometry reveals a previously undetected blue plume of young stars clearly distinguishable down to I~= 26. Our analysis suggests that 1.9 x 10^5^ M_o were produced between approximately 62 Myr and 335 Myr ago in the NGC 205 inner regions, with a latest minor episode occurring ~25 Myr ago. This implies a star formation rate of ~7x 10^-4^ M_o/yr over this period. Conclusions: The excellent fit of the observed luminosity function of young main sequence stars obtained with a model having a constant star formation rate argues against a tidally triggered star formation activity over the last ~300 Myr. Rather, a constant SF may be consistent with NGC 205 being on its first interaction with M 31. Key words: galaxies: evolution, galaxies: dwarf, galaxies: individual: NGC 205 dE
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