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Published September 2023 | Version Published
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SILVERRUSH. XIII. A Catalog of 20,567 Lyα Emitters at z = 2−7 Identified in the Full-depth Data of the Subaru/HSC-SSP and CHORUS Surveys

Creators

  • 1. ROR icon National Astronomical Observatory of Japan
  • 2. ROR icon University of Tokyo
  • 3. ROR icon The Graduate University for Advanced Studies, SOKENDAI
  • 4. ROR icon Kavli Institute for the Physics and Mathematics of the Universe
  • 5. ROR icon Kitami Institute of Technology
  • 6. ROR icon Waseda University
  • 7. ROR icon National Institute of Technology
  • 8. ROR icon University of Geneva
  • 9. ROR icon Carnegie Observatories
  • 10. ROR icon California Institute of Technology
  • 11. ROR icon NOIRLab

Abstract

We present 20,567 Lyα emitters (LAEs) at z = 2.2 − 7.3 that are photometrically identified by the SILVERRUSH program in a large survey area up to 25 deg² with deep images of five broadband filters (grizy) and seven narrowband filters targeting Lyα 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 >5σ sources showing narrowband color excesses via Lyα 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.

Copyright and License

© 2023. The Author(s). Published by the American Astronomical Society.

Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Acknowledgement

We thank the anonymous referee for careful reading and useful comments, and Ryohei Itoh for sharing his data and Ken Mawatari for his help with data analyses. This work is supported by World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan, as well as the joint research program of the Institute of Cosmic Ray Research (ICRR), the University of Tokyo. This study is supported by KAKENHI (19H00697, 20H00180, and 21H04467) Grant-in-Aid for Scientific Research (A) through the Japan Society for the Promotion of Science.

The Hyper Suprime-Cam (HSC) collaboration includes the astronomical communities of Japan and Taiwan, and Princeton University. The HSC instrumentation and software were developed by the National Astronomical Observatory of Japan (NAOJ), the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), the University of Tokyo, the High Energy Accelerator Research Organization (KEK), the Academia Sinica Institute for Astronomy and Astrophysics in Taiwan (ASIAA), and Princeton University. Funding was contributed by the FIRST program from the Japanese Cabinet Office, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), the Japan Society for the Promotion of Science (JSPS), Japan Science and Technology Agency (JST), the Toray Science Foundation, NAOJ, Kavli IPMU, KEK, ASIAA, and Princeton University.

This work is based on data collected at the Subaru Telescope and retrieved from the HSC data archive system, which is operated by Subaru Telescope and Astronomy Data Center (ADC) at NAOJ. Data analysis was in part carried out with the cooperation of Center for Computational Astrophysics (CfCA) at NAOJ. We are honored and grateful for the opportunity of observing the Universe from Maunakea, which has cultural, historical, and natural significance in Hawaii.

This paper makes use of software developed for Vera C. Rubin Observatory. We thank the Rubin Observatory for making their code available as free software at http://pipelines.lsst.io/.

Facilities

Subaru(HSC) - Subaru Telescope.

Software References

astropy (Robitaille et al. 2013; Price-Whelan et al. 2018), Source Extractor (Bertin & Arnouts 1996).

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Kikuta_2023_ApJS_268_24.pdf

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Additional details

Related works

Is new version of
Discussion Paper: arXiv:2305.08921 (arXiv)
Is supplemented by
Software: http://pipelines.lsst.io/ (URL)

Funding

Ministry of Education, Culture, Sports, Science and Technology
The University of Tokyo
Japan Society for the Promotion of Science
19H00697
Japan Society for the Promotion of Science
20H00180
Japan Society for the Promotion of Science
21H04467

Dates

Accepted
2023-06-30
Accepted
Available
2023-09-05
Published

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Publication Status
Published