other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
2010MNRAS.407..144T - Mon. Not. R. Astron. Soc., 407, 144-162 (2010/September-1)
Colour and stellar population gradients in galaxies: correlation with mass.
TORTORA C., NAPOLITANO N.R., CARDONE V.F., CAPACCIOLI M., JETZER Ph. and MOLINARO R.
Abstract (from CDS):
In particular, the most massive ETGs (M*≳ 1011 M☉) have shallow (even flat) CGs in correspondence of shallow (negative) metallicity gradients. In the stellar mass range (1010.3 - 1010.5) ≲ M*≲ 1011 M☉, the metallicity gradients reach their minimum of ∼ - 0.5/dex. At M*∼ 1010.3 - 1010.5 M☉, colour and metallicity gradient slopes suddenly change. They turn out to anticorrelate with the mass, becoming highly positive at the very low masses, the transition from negative to positive occurring at M* ∼ 109–9.5 M☉. These correlations are mirrored by similar trends of CGs with the effective radius and the velocity dispersion. We have also found that age gradients anticorrelate with metallicity gradients, as predicted by hierarchical cosmological simulations for ETGs. On the other side, LTGs have colour and metallicity gradients which systematically decrease with mass (and are always more negative than in ETGs), consistently with the expectation from gas infall and supernovae feedback scenarios.
Metallicity is found to be the main driver of the trend of CGs, especially for LTGs, but age gradients are not negligible and seem to play a significant role too. Owing to the large data set, we have been able to highlight that older galaxies have systematically shallower age and metallicity gradients than younger ones.
The emerging picture is qualitatively consistent with the predictions from hydrodynamical and chemodynamical simulations. In particular, our results for high-mass galaxies are in perfect agreement with predictions based on the merging scenario, while the evolution of LTGs and younger and less massive ETGs seems to be mainly driven by infall and supernovae feedback.
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: general - dark matter
Simbad objects: 4
To bookmark this query, right click on this link: simbad:2010MNRAS.407..144T and select 'bookmark this link' or equivalent in the popup menu