Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SDSS IV MaNGA: Visual Morphological and Statistical Characterization of
  the DR15 sample   We present a detailed visual morphological classification for the 4614 MaNGA
galaxies in SDSS Data Release 15, using image mosaics generated from a
combination of r-band (SDSS and deeper DESI Legacy Surveys) images and their
digital post-processing. We distinguish 13 Hubble types and identify the
presence of bars and bright tidal debris. After correcting the MaNGA sample for
volume completeness, we calculate the morphological fractions, the bi-variate
distribution of type and stellar mass M*-where we recognise a morphological
transition "valley" around S0a-Sa types- and the variations of the g-i colour
and luminosity-weighted age over this distribution. We identified bars in 46.8%
of galaxies, present in all Hubble types later than S0. This fraction amounts
to a factor ~2 larger when compared with other works for samples in common. We
detected 14% of galaxies with tidal features, with the fraction changing with
M* and morphology. For 355 galaxies, the classification was uncertain; they are
visually faint, mostly of low/intermediate masses, low concentrations, and
disky in nature. Our morphological classification agrees well with other works
for samples in common, though some particular differences emerge, showing that
our image procedures allow us to identify a wealth of added value information
as compared to SDSS-based previous estimates. Based on our classification, we
also propose an alternative criteria for the E-S0 separation, in the structural
semi-major to semi-minor axis versus bulge to total light ratio (b/a-B/T) and
concentration versus semi-major to semi-minor axis (C-b/a) space.

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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph