The age dependence of the size-stellar mass relation and some implications

Abstract

We use a sample of about 48,000 SDSS early-type galaxies to show that older galaxies have smaller half-light radii re and larger velocity dispersions sigma than younger ones of the same stellar mass Mstar. We use the age-corrected luminosity Lcorr as a proxy for Mstar to minimize biases: below Lcorr~1e11 Lsun, galaxies with age ~11 Gyrs have re smaller by 40% and sigma larger by 25%, compared to galaxies that are ~4 Gyrs younger. The sizes and velocity dispersions of more luminous galaxies vary by less than 15%, whatever their age, a challenge for current galaxy formation models. A closer check reveals that the lowering in the dispersion is caused by older galaxies that show a significant departure from the re--Lcorr and sigma--Lcorr relations at high Lcorr. Such features might find an explanation in models where more massive galaxies undergo more minor mergers than less massive galaxies at late times, thus causing a break in the homology. In terms of the Fundamental Plane of early-type galaxies, the data indicate that all galaxies show a significant and similar increase in the dynamical-to-stellar mass ratio with increasing mass, independent of their age. However, older galaxies have smaller Mdyn/Mstar ratios than objects which formed more recently. These findings may suggest that lower mass galaxies and, at fixed stellar mass, higher redshift galaxies, formed from gas-richer progenitors, thus underwent more dissipation and contraction.

Accepted by MNRAS Letter

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• On the Size and Comoving Mass Density Evolution of Early-Type Galaxies
• Size Evolution of Spheroids in a Hierarchical Universe
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• SPIDER - III. Environmental Dependence of the Fundamental Plane of Early-type Galaxies
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• Sizes and ages of SDSS ellipticals: Comparison with hierarchical galaxy formation models
• SPIDER - VI. The Central Dark Matter Content of Luminous Early-Type Galaxies: Benchmark Correlations with Mass, Structural Parameters and Environment
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• The Environmental Dependence of the Luminosity-Size Relation for Galaxies
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• The last 6 Gyr of dark matter assembly in massive galaxies from the Kilo Degree Survey
• Further constraining galaxy evolution models through the Size Function of SDSS Early-type galaxies
• Stellar populations of galaxies in the ALHAMBRA survey up to $z\sim 1$. IV. Properties of quiescent galaxies on the stellar mass$-$size plane
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• The Puzzling Origin of Massive Compact Galaxies in MaNGA
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