Passive spiral galaxies deeply captured by Subaru Hyper Suprime-Cam
  This paper presents a thousand passive spiral galaxy samples at $z=$ 0.01-0.3
based on a combined analysis of the Third Public Data Release of the Hyper
Suprime-Cam Subaru Strategic Program (HSC-SSP PDR3) and the GALEX-SDSS-WISE
Legacy Catalog (GSWLC-2). Among 54871 $gri$ galaxy cutouts taken from the
HSC-SSP PDR3 over 1072 deg$^2$, we conducted a search with deep-learning
morphological classification for candidates of passive spirals below the
star-forming main sequence derived by UV to mid-IR SED fitting in the GSWLC-2.
We then classified the candidates into 1100 passive spirals and 1141 secondary
samples based on visual inspections. Most of the latter cases are considered to
be passive ringed S0 or pseudo-ringed galaxies. The remainder of these
secondary samples has ambiguous morphologies, including two peculiar objects
with diamond-shaped stellar wings. The selected passive spirals have a similar
distribution to the general quiescent galaxies on the
EW$_\mathrm{H\delta}$-D$_n$4000 diagram and concentration indices. Moreover, we
detected an enhanced passive fraction of spiral galaxies in X-ray clusters.
Passive spirals in galaxy clusters are preferentially located in the midterm or
late infall phase on the phase-space diagram, supporting the ram pressure
scenario, which has been widely advocated in previous studies. The source
catalog and $gri$-composite images are available on the HSC-SSP PDR3 website
(https://hsc.mtk.nao.ac.jp/ssp/data-release/). Future updates, including
integration with a citizen science project dedicated to the HSC data, will
achieve more effective and comprehensive classifications.
