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Symposium 241
Symposium 241
Abstract details
Spatially resolved spectroscopy of early-type galaxies over a range in mass
Patricia Sanchez-Blazquez, Duncan Forbes, Jay Strader, Jean BrodieAbstract
Long-slit spectra have been obtained with the Keck telescope for a sample
of 11 early-type galaxies covering a range in luminosity. Rotation velocity
and velocity dispersions, together with 20 Lick line-strength gradients
have been measured to, at least, one effective radius. We transform
line-strength gradients into age, metallicity and $\alpha$/Fe abundances.
Galaxies show very shallow age gradients, strong metallicity gradients, and
both, positive and negative $\alpha$/Fe gradients which
cannot be explained with simple outside-in scenarios of galaxy formation.
We explore the correlation of the gradients with other
global parameters of the galaxies finding different behaviour for the two
families of galaxies, luminous (boxy, core inner profile) and
less luminous (disky, cuspy inner profile) galaxies. We propose different scenarios
to explain the correlations.