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Table · dataset · 2023

Passive spiral galaxies

Listed in IVOA Registry (Virtual Observatory)

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).

Description

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 ultraviolet to mid-infrared spectral energy distribution 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 remaining secondary samples have ambiguous morphologies, including two peculiar objects with diamond-shaped stellar wings.

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The selected passive spirals have a similar distribution to the general quiescent galaxies on the EW_H{alpha}_-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 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.

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