dwarf elliptical galaxies as probes of galaxy formation

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Dwarf elliptical galaxies as probes of galaxy formation and evolution

Marina Trevisan

Reinaldo de Carvalho, Fabricio Ferrari, Ignacio Ferreras, Francesco la Barbera, Ignacio de la Rosa

24 April 2013

Galaxy Formation and Evolution

● Galaxy evolution/formation scenario must be able to predict and describe the properties of galaxies in all mass ranges.

● Different processes acting in galaxies with different masses:

– SN/AGN feedback;

– IMF;

– Environment...

● Dificuldade na classificação

M (M☉)

5 ∙ 10111 ∙ 10111 ∙ 10101 ∙ 1095 ∙ 108

Elliptical Galaxies

dwarfs

Galaxy Zoo Project

Visual Classification

Parameter Space

Elliptical M > 3 ∙ 1010 M☉

Elliptical M > 3 ∙ 1010 M☉

Elliptical M < 1 ∙ 1010 M☉

Elliptical M < 1 ∙ 1010 M☉

Spiral M < 1 ∙ 1010 M☉Spiral M < 1 ∙ 1010 M☉

Asymmetry

Sersic index

Concentration

Asymmetry

Concentration

Sersic index

● Dwarf sample:

– Stellar population analysis   Star formation history, →chemical enrichment

Formation and Evolution of Dwarf ETGs

de la Rosa et al. 2011

Trevisan et al. 2012

Mass Assembly

Trevisan et al. 2012

Chemical Enrichment

● Dwarf sample:

– Stellar population analysis   Star formation history, →chemical enrichment

● Different environments

Formation and Evolution of Dwarf ETGs

Formation and Evolution of Dwarf ETGs

● Dwarf sample:

– Stellar population analysis   Star formation history, →chemical enrichment

● Different environments

– Explore stellar population properties in the outer regions

→ Web-Starlight

→SSP models with variable chemical abundances

Correlations between galaxy properties and evolutionary

stage of groups

Correlation between

σ and IMF slope

Radial gradients with VLT data

2013

2012

Thank you!

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