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|Title:||Evolution of galaxy size-stellar mass relation from the Kilo-Degree Survey||Authors:||Roy, N.
NAPOLITANO, NICOLA ROSARIO
LA BARBERA, Francesco
RAJ, MARIA ANGELA
PUDDU, Emanuella Anna
Verdoes Kleijn, G.
|Issue Date:||2018||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||480||Issue:||1||First Page:||1057||Abstract:||We have obtained structural parameters of about 340 000 galaxies from the Kilo-Degree Survey (KiDS) in 153 deg<SUP>2</SUP> of data release 1, 2, and 3. We have performed a seeing convolved 2D single Sérsic fit to the galaxy images in the four photometric bands (u, g, r, i) observed by KiDS, by selecting high signal-to-noise ratio (S/N > 50) systems in every bands. We have classified galaxies as spheroids and disc-dominated by combining their spectral energy distribution properties and their Sérsic index. Using photometric redshifts derived from a machine learning technique, we have determined the evolution of the effective radius, R<SUB>e</SUB> and stellar mass, M<SUB>⋆</SUB>, versus redshift, for both mass complete samples of spheroids and disc-dominated galaxies up to z∼0.6. Our results show a significant evolution of the structural quantities at intermediate redshift for the massive spheroids (log M<SUB>*</SUB>/M<SUB>☉</SUB> > 11, Chabrier IMF), while almost no evolution has found for less massive ones (log M<SUB>*</SUB>/M<SUB>☉</SUB> < 11). On the other hand, disc dominated systems show a milder evolution in the less massive systems (log M<SUB>*</SUB>/M<SUB>☉</SUB> < 11) and possibly no evolution of the more massive systems. These trends are generally consistent with predictions from hydrodynamical simulations and independent datasets out to redshift z ∼ 0.6, although in some cases the scatter of the data is large to drive final conclusions. These results, based on 1/10 of the expected KiDS area, reinforce precedent finding based on smaller statistical samples and show the route towards more accurate results, expected with the the next survey releases.||URI:||http://hdl.handle.net/20.500.12386/27542||URL:||http://arxiv.org/abs/1807.06085v1
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Oct 27, 2020
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