Abstract
We have obtained structural parameters of about 340,000 galaxies from
the Kilo Degree Survey (KiDS) in 153 square degrees of data release 1, 2
and 3. We have performed a seeing convolved 2D single S\'ersic fit to
the galaxy images in the 4 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
S\'ersic index. Using photometric redshifts derived from a machine
learning technique, we have determined the evolution of the effective
radius, \Re\ and stellar mass, \mst, 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 ($\mbox{Log}\
M_*/M_\odot>11$, Chabrier IMF), while almost no evolution has found
for less massive ones ($\mbox{Log}\ M_*/M_\odot <11$). On the other
hand, disc dominated systems show a milder evolution in the less massive
systems ($\mbox{Log}\ M_*/M_\odot <11$) 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 toward more accurate results,
expected with the the next survey releases.
Original language | English |
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Pages (from-to) | 1057-1080 |
Number of pages | 24 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 480 |
Issue number | 1 |
DOIs | |
Publication status | Published - 11-Oct-2018 |
Keywords
- Astrophysics - Astrophysics of Galaxies
- DIGITAL SKY SURVEY
- COLOR-MAGNITUDE RELATION
- HIGH-REDSHIFT GALAXIES
- CENTRAL DARK-MATTER
- INSIDE-OUT GROWTH
- ULTRA-DEEP-FIELD
- TO-LIGHT RATIOS
- BLACK-HOLE MASS
- ELLIPTIC GALAXIES
- ASSEMBLY GAMA