Abstract
We report the morphological classification of 3727 galaxies from the Galaxy and Mass Assembly survey with Mr < −17.4 mag and in the redshift range 0.025 < z < 0.06 (2.1 × 105 Mpc3)
into E, S0-Sa, SB0-SBa, Sab-Scd, SBab-SBcd, Sd-Irr and little blue
spheroid classes. Approximately 70 per cent of galaxies
in our sample are disc-dominated systems, with the
remaining ∼30 per cent spheroid dominated. We establish the robustness
of our classifications, and use them to derive
morphological-type luminosity functions and luminosity densities in the ugrizYJHK
passbands, improving on prior studies that split by global colour or
light profile shape alone. We find that the total galaxy
luminosity function is best described by a
double-Schechter function while the constituent morphological-type
luminosity functions
are well described by a single-Schechter function.
These data are also used to derive the star formation rate densities for
each Hubble class, and the attenuated and
unattenuated (corrected for dust) cosmic spectral energy distributions,
i.e. the
instantaneous energy production budget. While the
observed optical/near-IR energy budget is dominated 58:42 by galaxies
with
a significant spheroidal component, the actual
energy production rate is reversed, i.e. the combined disc-dominated
populations
generate ∼1.3 times as much energy as the
spheroid-dominated populations. On the grandest scale, this implies that
chemical
evolution in the local Universe is currently
largely confined to mid-type spiral classes like our Milky Way.
Original language | English |
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Pages (from-to) | 1245-1269 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 439 |
Issue number | 2 |
Early online date | 12 Feb 2014 |
DOIs | |
Publication status | Published - Apr 2014 |