SILVERRUSH. XIII. A Catalog of 20,567 Lya Emitters at z=2-7 Identified in the Full-depth Data of the Subaru/HSC-SSP and CHORUS Surveys

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES(2023)

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摘要
We present 20,567 Lya emitters (LAEs) at z = 2.2 - 7.3 that are photometrically identified by the SILVERRUSH program in a large survey area up to 25 deg(2) with deep images of five broadband filters (grizy) and seven narrowband filters targeting Ly alpha lines at z = 2.2, 3.3, 4.9, 5.7, 6.6, 7.0, and 7.3 taken by the Hyper Suprime-Cam Subaru Strategic Program and the Cosmic HydrOgen Reionization Unveiled with Subaru survey. We select secure >5 sigma sources showing narrowband color excesses via Ly alpha break screening, taking into account the spatial inhomogeneity of limiting magnitudes. After removing spurious sources by careful masking and visual inspection of coadded and multiepoch images obtained over the 7 yr of the surveys, we construct LAE samples consisting of 6995, 4641, 726, 6124, 2058, 18, and 5 LAEs at z = 2.2, 3.3, 4.9, 5.7, 6.6, 7.0, and 7.3, respectively, although the z = 7.3 candidates are tentative. Our LAE catalogs contain 289 spectroscopically confirmed LAEs at the expected redshifts from previous work. We demonstrate that the number counts of our LAEs are consistent with previous studies with similar LAE selection criteria. The LAE catalogs will be made public on our project webpage with detailed descriptions of the content and ancillary information about the masks and limiting magnitudes.
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