Capaccioli, Massimo (2007) Surface Brightness Fluctuations from Archival ACS Images: A Stellar Population and Distance Study. [Pubblicazione in rivista scientifica]

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Tipologia del documento: Pubblicazione in rivista scientifica
Titolo: Surface Brightness Fluctuations from Archival ACS Images: A Stellar Population and Distance Study
Autori:
AutoreEmail
Capaccioli, Massimo[non definito]
Autore/i: M. Cantiello, J. Blakeslee, G. Raimondo, V. Brocato, M. Capaccioli,
Data: 2007
Numero di pagine: 20
Dipartimento: Scienze fisiche
Titolo del periodico: THE ASTROPHYSICAL JOURNAL
Data: 2007
Volume: 688
Numero: 1
Intervallo di pagine: pp. 130-149
Numero di pagine: 20
Depositato il: 20 Ott 2010 08:33
Ultima modifica: 30 Apr 2014 19:42
URI: http://www.fedoa.unina.it/id/eprint/6648

Abstract

We derive surface brightness fluctuations (SBF) and integrated magnitudes in the V and I bands using Advanced Camera for Surveys (ACS) archival data. The sample includes 14 galaxies covering a wide range of physical properties: morphology, total absolute magnitude, and integrated color. We take advantage of the latter characteristic of the sample to check existing empirical calibrations of absolute SBF magnitudes both in the I and V passbands. In addition, by comparing our SBF and color data with the Teramo-SPoT simple stellar population models and other recent sets of population synthesis models, we discuss the feasibility of stellar population studies based on fluctuation magnitudes analysis. The main result of this study is that multiband optical SBF data and integrated colors can be used to significantly constrain the chemical composition of the dominant stellar system in the galaxy, but not the age in the case of systems older than 3 Gyr. SBF color gradients are also detected and analyzed. These SBF gradient data, together with other available data, point to the existence of mass dependent metallicity gradients in galaxies, with the more massive objects showing a nonnegligible SBF versus color gradient. The comparison with models suggests that such gradients imply more metal rich stellar populations in the galaxies' inner regions with respect to the outer ones.

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