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INSTITUTO DE ASTROFÍSICA DE CANARIAS Alexandre Vazdekis

INSTITUTO DE ASTROFÍSICA DE CANARIAS Alexandre Vazdekis. MAGPOP ACTIVITY AT IAC. MAGPOP Mid-Term Review. La Palma, 7-8/12/2006. M. Balcells, C. Carretero, J. Cenarro, J.L. Cervantes, A. de Lorenzo-Cáceres, AV. Stellar population model developments.

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INSTITUTO DE ASTROFÍSICA DE CANARIAS Alexandre Vazdekis

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  1. INSTITUTO DE ASTROFÍSICA DE CANARIAS Alexandre Vazdekis MAGPOP ACTIVITY AT IAC MAGPOP Mid-Term Review La Palma, 7-8/12/2006 M. Balcells, C. Carretero, J. Cenarro, J.L. Cervantes, A. de Lorenzo-Cáceres, AV

  2. Stellar population model developments • ~1000 stars (Sánchez-Blázquez etal.2006; Cenarro etal.2006) • High S/N (>100) flux calibrated spectra • Spectral range: 3500–7500Å at 2.3Å (FWHM) • Unprecedented stellar parameter coverage • [M/H]=0.0 • 12.5Gyr t z + UCM Groningen 2

  3. Models and methodology • Some examples of fits to ITP-MAGPOP dwarfs: 3

  4. New optimized indices…for obtaining accurate stellar population parameters • An optimized Hβ age indicator that is virtually free from metallicity and abundance ratios effects Cervantes-Rodriguez et al. (2007) 4

  5. Cleaning absorption lines from nebular emission. • Alternative approach based on the use of model SSP spectra to fit the full spectrum including several Balmer lines • … to obtain accurate age estimates. de Lorenzo-Cáceres et al. (2007) 5

  6. Mg C,N Fe time Abundance ratios and environment CN abundance ratio correlates with Lx, which traces cluster mass: • Shorter formation timescales in more massive clusters • Timescales are shorter than 1Gyr in all galaxy clusters for intermediate/massive ellipticals Carretero et al. (2004,2006) 6

  7. Stellar populations of Extragalactic Globular Clusters HST/ACS GCs are fossils of the main star-forming events in the Universe • Most GCs are found to be old  Galaxy formation/assembly should happen at high z • Some youngish GCs are consistent with being old hosting BHB and/or blue straggler stars • Detailed analysis of abundance ratios: • Two subpopulations of MR GCs with different [Mg/Fe] and [C/Fe] values • Strong CN overabundance • Intriguing C-N anticorrelation for MR GCs  Consequence of the CNO cycle? NGC1407 Cenarro et al. (2007) 7

  8. Confirm knee in K counts, K=17.5 Gardner-style number count models Simultaneously reproduce number counts in Groth, U, B, Ks Cristóbal-Hornillos et al. 2003; Eliche-Moral et al (2006) Late zf=1.5 for ellipticals gives knee in Ks counts Ks~17.5 Implies mean age 9 Gyr, consistent with independent results. Balcells, David Cristóbal-Hornillos, Carmen Eliche-Moral, Mercedes Prieto B,K counts: constrain E formation epoch 8

  9. Bulges 0.3<z<1 are red • Bulge-disk galaxies in Groth, GOODS-N: • “Bulge galaxies” have a Red Sequence in bulge colors (R=0.2” ~ 1.5 kpc) • Bulge colors scale with disk colors, and with global colors, same as in local Universe U-B rest-frame nuclear colors vs GLOBAL colors U-B rest-frame BULGE colors, bulges vs no-bulges Lilian Domínguez & Balcells 9

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