Age and Metallicity Distribution of the Galactic Bulge from Extensive Optical and Near-IR S.pdf

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Age and Metallicity Distribution of the Galactic Bulge from Extensive Optical and Near-IR S.pdf

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Age and Metallicity Distribution of the Galactic Bulge from Extensive Optical and Near-IR S

a r X i v : a s t r o - p h / 0 2 1 0 6 6 0 v 1 3 0 O c t 2 0 0 2 Astronomy Astrophysics manuscript no. revised February 2, 2008 (DOI: will be inserted by hand later) Age and Metallicity Distribution of the Galactic Bulge from Extensive Optical and Near-IR Stellar Photometry ? M. Zoccali1, A. Renzini1, S. Ortolani2, L. Greggio3, I. Saviane4, S. Cassisi5, M. Rejkuba1, B. Barbuy6, R.M. Rich7, E. Bica8 1 European Southern Observatory, Karl Schwarzschild Strasse 2, D-85748, Garching bei Mu?nchen, Germany; mzoccali@, arenzini@, mrejkuba@ 2 Universita? di Padova, Dipart. di Astronomia, Vicolo dell’Osservatorio 2, I-35122 Padova, Italy; or- tolani@pd.astro.it 3 INAF, Osservatorio Astronomico di Padova, Padova, Italy; greggio@pd.astro.it 4 European Southern Observatory, Alonso de Cordova 3107, Santiago 19, Chile; isaviane@ 5 INAF, Osservatorio Astronomico Collurania, I-64100, Teramo, Italy; cassisi@te.astro.it 6 Universidade de Sa?o Paulo, CP 3386, Sa?o Paulo 01060-970, Brazil; barbuy@astro.iag.usp.br 7 Department of Physics and Astronomy, Division of Astronomy and Astrophysics, University of California, Los Angeles, CA 90095-1562; rmr@ 8 Universidade Federal do Rio Grande do Sul, Dept. de Astronomia, CP 15051, Porto Alegre 91501-970, Brazil; bica@if.ufrgs.br Received date / Accepted date Abstract. We present a new determination of the metallicity distribution, age, and luminosity function of the Galactic bulge stellar population. By combining near-IR data from the 2MASS survey, from the SOFI imager at ESO NTT and the NICMOS camera on board HST we were able to construct color-magnitude diagrams (CMD) and luminosity functions (LF) with large statistics and small photometric errors from the Asymptotic Giant Branch (AGB) and Red Giant Branch (RGB) tip down to ～ 0.15M⊙. This is the most extended and complete LF so far obtained for the galactic bulge. Similar near-IR data for a disk control field were used to decontaminate the bulge CMDs from foreground disk stars, and hen