Survey of Gravitationally lensed Objects in HSC Imaging (SuGOHI) V. Group-to-cluster scale lens search from the HSC-SSP Survey. (2020)
Keywords :
gravitational lensing strong - methods: observational - surveys - galaxies: clusters: general
Abstract:We report the largest sample of candidate strong gravitational lenses belonging to the Survey of Gravitationally lensed Objects in HSC Imaging for group-to-cluster scale (SuGOHI-c) systems. These candidates are compiled from the S18A data release of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) Survey. We visually inspect ~39500 galaxy clusters, selected from several catalogues, overlapping with the Wide, Deep, and UltraDeep fields, spanning the cluster redshift range of 0.05<z_cl_<1.38. We discover 641 candidate lens systems, of which 536 are new. From the full sample, 47 are almost certainly bona fide lenses, 181 of them are highly probable lenses, and 413 are possible lens systems. Additionally, we present
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The Subaru Strategic Program (SSP) survey is carried out with the
Hyper Suprime-Cam (HSC, Coupon et al. 2018PASJ...70S...7C; Furusawa et
al. 2018PASJ...70S...3F; Huang et al. 2018PASJ...70S...6H; Kawanomoto
et al. 2018PASJ...70S...2K; Komiyama et al. 2018PASJ...70S...2K;
Miyazaki et al. 2018PASJ...70S...1M), a 1.7deg^2^ field-of-view
optical camera recently installed on the 8.2-m Subaru telescope. The
HSC-SSP Survey has three fields: the Wide field is expected to cover a
1400deg^2^ area in five bands (g, r, i, z, and y) to an i-band depth
of 26.2 by its completion, while the Deep+UltraDeep fields are
expected to cover smaller areas of about 27deg^2^ and 3.5deg^2^. We
use the photometric data from the S18A data release, which covers
1114deg^2^ (out of which 305deg^2^ is full depth) in Wide and 31deg^2^
in Deep+UltraDeep, at least in one filter and one exposure (Aihara et
al. 2019PASJ...71..114A).
The redshifts used in this work are obtained from the photometric
redshift catalogue of the HSC-SSP Survey, determined using the Direct
Empirical Photometric code (DEmP, Hsieh & Yee 2014ApJ...792..102H).
The HSC-SSP photometric redshifts are most accurate at
0.2~<z_phot_~<1.5.
Since the HSC-SSP Survey footprint has some overlap with that of the
Sloan Digital Sky Survey (SDSS), we also extracted spectroscopic
redshifts, whenever available, from the SDSS Data Release 15 (Aguado
et al. 2019ApJS..240...23A) catalogues.
