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Intracluster gas enrichment and star formation efficiency in clusters of galaxies

 Grant number: 08/04318-7 Support type: Scholarships in Brazil - Post-Doctorate Effective date (Start): September 01, 2008 Effective date (End): August 31, 2012 Field of knowledge: Physical Sciences and Mathematics - Astronomy Principal Investigator: Gastão Cesar Bierrenbach Lima Neto Grantee: Tatiana Ferraz Laganá Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil Associated research grant: 06/56213-9 - New physics from space: formation and evolution of structures in the universe, AP.TEM Abstract X-ray observations of galaxy clusters have shown that the intracluster gas presents iron abundances of one third of about the solar value. These observations also show that part (if not all) of the intra-cluster gas metals were produced within the member galaxies. We observe the presence of $\alpha$-elements, which are produced in supernovae type IIand the iron group elements which are essentially produced in supernovae type Ia.The ratio between the $\alpha$ elements and the iron abundance can constraint the metal enrichment historyof the intracluster gas.Since the red population is dominant in galaxy clusters,it is natural to assume that it is the main responsible for the metal enrichment of the intracluster gas. However, the role of the different morphological galaxy types to the gas enrichment is not yet well understood.In this post-doc project we propose to investigate the gas enrichment process and the role of galaxies. To do so, we will select a sample of galaxies observed in conjunction with the XMM-Newton and the Sloan Digital Sky Survey (SDSS). The sensitivity of the XMM-Newton is absolutely necessary to the spectroscopical analysis of the gas. We will select at least 20 galaxy clusters within the redshift interval 0.1 < z < 0.3 and with X-ray exposure times grater than 10ks.From the spectroscopic analysis we will be able to determine the metallicity and the gas temperature distribution. From the optical analysis we will compute the contribution of the different morphological types to the total luminosity. Using a multi-wavelength study of clusters of galaxies we will investigate possible correlations between optical and X-ray properties and give new constraints to the history of intracluster gasenrichment.

Scientific publications (8)
(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)
ANDRADE-SANTOS, FELIPE; LIMA NETO, GASTAO B.; LAGANA, TATIANA F. A NEW METHOD TO QUANTIFY X-RAY SUBSTRUCTURES IN CLUSTERS OF GALAXIES. ASTROPHYSICAL JOURNAL, v. 746, n. 2 FEB 20 2012. Web of Science Citations: 16.
LAGANA, TATIANA F.; ZHANG, YU-YING; REIPRICH, THOMAS H.; SCHNEIDER, PETER. XMM-NEWTON/SLOAN DIGITAL SKY SURVEY: STAR FORMATION EFFICIENCY IN GALAXY CLUSTERS AND CONSTRAINTS ON THE MATTER-DENSITY PARAMETER. ASTROPHYSICAL JOURNAL, v. 743, n. 1 DEC 10 2011. Web of Science Citations: 30.
ZHANG, Y. -Y.; LAGANA, T. F.; PIERINI, D.; PUCHWEIN, E.; SCHNEIDER, P.; REIPRICH, T. H. Star-formation efficiency and metal enrichment of the intracluster medium in local massive clusters of galaxies. Astronomy & Astrophysics, v. 535, NOV 2011. Web of Science Citations: 26.
DURRET, F.; LAGANA, T. F.; HAIDER, M. The merging cluster Abell 1758 revisited: multi-wavelength observations and numerical simulations. Astronomy & Astrophysics, v. 529, MAY 2011. Web of Science Citations: 26.
DURRET, F.; LAGANA, T. F.; ADAMI, C.; BERTIN, E. The clusters Abell 222 and Abell 223: a multi-wavelength view. Astronomy & Astrophysics, v. 517, JUL 2010. Web of Science Citations: 14.
LAGANA, T. F.; ANDRADE-SANTOS, F.; LIMA NETO, G. B. Spiral-like structure at the centre of nearby clusters of galaxies. Astronomy & Astrophysics, v. 511, FEB-MAR 2010. Web of Science Citations: 29.
LAGANA, T. F.; DE SOUZA, R. S.; KELLER, G. R. On the influence of non-thermal pressure on the mass determination of galaxy clusters. Astronomy & Astrophysics, v. 510, FEB 2010. Web of Science Citations: 25.
MOUSSAOUI, N.; CLEMESHA, B. R.; HOLZLOEHNER, R.; SIMONICH, D. M.; CALIA, D. BONACCINI; HACKENBERG, W.; BATISTA, P. P. Statistics of the sodium layer parameters at low geographic latitude and its impact on adaptive-optics sodium laser guide star characteristics. Astronomy & Astrophysics, v. 511, FEB-MAR 2010. Web of Science Citations: 24.