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The modeling of stellar populations and detailed abundance patterns

Abstract

The chemical pattern of galaxies is a keystone to understanding their formation and evolution. Recent large spectroscopic galaxy surveys at medium and high spectral resolution have opened a new window in this area, by allowing us to study the signatures of thousands of metal absorption lines. The interpretation of such data should allow us to constrain both the star formation and chemical enrichment history of galaxies. The present research proposal aims at studying the evolutionary histories of galaxies by developing and using a new type of sophisticated models, which combines the recent development in stellar population models by (Coelho et al., 2007) with prescriptions of chemical evolution models. Applications are many-fold: I will compare model predictions to observed integrated spectra of extragalactic globular clusters to constrain the early enrichment history of M31. Then, I will analyze integral field unit spectra of a sample of bulge less nearby galaxies, which have presumably undergone smooth star formation, to gain insight on the history of gas in fall onto galaxy disks. Finally, I will use the new models to interpret the high-resolution spectra of galaxies from various modern surveys, in a wide range of spectral and morphological types. This new kind of spectral model will ultimately allow us to interpret consistently the star formation and chemical enrichment history from any integrated absorption spectra of unresolved systems, virtually any galaxy. (AU)

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VEICULO: TITULO (DATA)

Scientific publications (7)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
VAZDEKIS, A.; COELHO, P.; CASSISI, S.; RICCIARDELLI, E.; FALCON-BARROSO, J.; SANCHEZ-BLAZQUEZ, P.; LA BARBERA, F.; BEASLEY, M. A.; PIETRINFERNI, A. Evolutionary stellar population synthesis with MILES - II. Scaled-solar and alpha-enhanced models. Monthly Notices of the Royal Astronomical Society, v. 449, n. 2, p. 1177-1214, MAY 11 2015. Web of Science Citations: 91.
MARTINS, LUCIMARA P.; COELHO, PAULA; CAPRONI, ANDERSON; VITORIANO, ROBERTO. alicce: Atomic Lines Calibration using the Cross-Entropy Algorithm. Monthly Notices of the Royal Astronomical Society, v. 442, n. 2, p. 1294-1302, AUG 1 2014. Web of Science Citations: 6.
COELHO, P. R. T. A new library of theoretical stellar spectra with scaled-solar and alpha-enhanced mixtures. Monthly Notices of the Royal Astronomical Society, v. 440, n. 2, p. 1027-1043, MAY 2014. Web of Science Citations: 42.
YONG, DAVID; MELENDEZ, JORGE; GRUNDAHL, FRANK; ROEDERER, IAN U.; NORRIS, JOHN E.; MILONE, A. P.; MARINO, A. F.; COELHO, P.; MCARTHUR, BARBARA E.; LIND, K.; COLLET, R.; ASPLUND, MARTIN. High precision differential abundance measurements in globular clusters: chemical inhomogeneities in NGC 6752. Monthly Notices of the Royal Astronomical Society, v. 434, n. 4, p. 3542-3565, OCT 2013. Web of Science Citations: 44.
CEZARIO, E.; COELHO, P. R. T.; ALVES-BRITO, A.; FORBES, D. A.; BRODIE, J. P. Full spectral fitting of Milky Way and M31 globular clusters: ages and metallicities. Astronomy & Astrophysics, v. 549, JAN 2013. Web of Science Citations: 12.
COELHO, P.; GADOTTI, D. A. BARS REJUVENATING BULGES? EVIDENCE FROM STELLAR POPULATION ANALYSIS. Astrophysical Journal Letters, v. 743, n. 1 DEC 10 2011. Web of Science Citations: 56.
COELHO, P.; PERCIVAL, S. M.; SALARIS, M. CHEMICAL ABUNDANCE ANTICORRELATIONS IN GLOBULAR CLUSTER STARS: THE EFFECT ON CLUSTER INTEGRATED SPECTRA. ASTROPHYSICAL JOURNAL, v. 734, n. 1 JUN 10 2011. Web of Science Citations: 10.

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