Deep Learning Assessment of galaxy morphology in S-PLUS DataRelease 1
  The morphological diversity of galaxies is a relevant probe of galaxy
evolution and cosmological structure formation, but the classification of
galaxies in large sky surveys is becoming a significant challenge. We use data
from the Stripe-82 area observed by the Southern Photometric Local Universe
Survey (S-PLUS) in twelve optical bands, and present a catalogue of the
morphologies of galaxies brighter than $r=17$ mag determined both using a novel
multi-band morphometric fitting technique and Convolutional Neural Networks
(CNNs) for computer vision. Using the CNNs we find that, compared to our
baseline results with 3 bands, the performance increases when using 5 broad and
3 narrow bands, but is poorer when using the full $12$ band S-PLUS image set.
However, the best result is still achieved with just 3 optical bands when using
pre-trained network weights from an ImageNet data set. These results
demonstrate the importance of using prior knowledge about neural network
weights based on training in unrelated, extensive data sets, when available.
Our catalogue contains 3274 galaxies in Stripe-82 that are not present in
Galaxy Zoo 1 (GZ1), and we also provide our classifications for 4686 galaxies
that were considered ambiguous in GZ1. Finally, we present a prospect of a
novel way to take advantage of $12$ band information for morphological
classification using morphometric features, and we release a model that has
been pre-trained on several bands that could be adapted for classifications
using data from other surveys. The morphological catalogues are publicly
available.
