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MUSUBI (MegaCam Ultra-deep Survey: u*-band Imaging) Data for the COSMOS and SXDS Fields

Wang, Wei-Hao and Foucaud, Sébastien and Hsieh, Bau-Ching and Jian, Hung-Yu and Lin, Lihwai and Lin, Yen-Ting and Coupon, Jean and Hashimoto, Yasuhiro and Ouchi, Masami and Shimasaku, Kazuhiro and Ohyama, Youichi and Umetsu, Keiichi and Wang, Shiang-Yu and Chang, Tzu-Ching (2022) MUSUBI (MegaCam Ultra-deep Survey: u*-band Imaging) Data for the COSMOS and SXDS Fields. Astrophysical Journal Supplement Series, 260 (2). Art. No. 54. ISSN 0067-0049. doi:10.3847/1538-4365/ac729e.

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The Subaru Hyper Suprime-Cam (HSC) Strategic Survey is the latest-generation multiband optical imaging survey for galaxy evolution and structure formation. The “Ultra-deep” component of the HSC survey provides grizy broadband images over ∼3.4 deg² to detection limits of ∼26–28 AB, along with narrowband images, in the COSMOS and SXDS fields. These images provide an unprecedented combination of depths and area coverage, for studies of galaxies up to z ∼ 7. However, the lack of coverage at z ≲ 3, which is critically needed for understanding the buildup of stellar mass in later cosmic time. We conducted a multiyear CFHT u*-band imaging campaign in the two HSC Ultra-deep fields with CFHT MegaCam. By including shallower archival data, we reached 5σ depths of u* = 28.1 and 28.4 (AB) at the centers of the COSMOS and SXDS fields, respectively, and u* = 27.7 and 27.8 in the central 1 deg2 fields. The image quality is ≳ 0.″90, fairly good for the u* band. Both the photometric and astrometric quality of our data are excellent. We show that the combination of our u*-band and HSC data can lead to high-quality photometric redshifts at z = 0–3, and robust measurements of rest-frame UV on galaxies at 0.4 z u*-band images and reference catalogs, which can be used readily for scientific studies.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Wang, Wei-Hao0000-0003-2588-1265
Foucaud, Sébastien0000-0001-5603-6262
Hsieh, Bau-Ching0000-0001-5615-4904
Jian, Hung-Yu0000-0002-6121-8420
Lin, Lihwai0000-0001-7218-7407
Lin, Yen-Ting0000-0001-7146-4687
Hashimoto, Yasuhiro0000-0001-9677-7858
Ouchi, Masami0000-0002-1049-6658
Shimasaku, Kazuhiro0000-0002-2597-2231
Ohyama, Youichi0000-0001-9490-3582
Umetsu, Keiichi0000-0002-7196-4822
Wang, Shiang-Yu0000-0001-6491-1901
Chang, Tzu-Ching0000-0001-5929-4187
Alternate Title:MUSUBI (MegaCam Ultra-deep Survey: u∗-Band Imaging)-Data for the COSMOS and SXDS Fields
Additional Information:© 2022. 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. Received 2022 February 24; revised 2022 May 12; accepted 2022 May 22; published 2022 June 30. We thank the referee for comments that greatly improved the article. We thank the CFHT staff for observational support, and in particular for making the legacy u* filter available to us when MegaCam was migrating to the new filter system. MegaCam is a joint project of the CFHT and CEA/DAPNIA, at the CFHT, which is operated by the National Research Council of Canada, Institut National des Science de l'Univers of Centre National de la Recherche Scientifique of France, and the University of Hawaii. The observations at the CFHT were performed with care and respect from the summit of Maunakea, which is a significant cultural and historic site. We are most fortunate to have the opportunity to conduct observations from this mountain. We gratefully acknowledge support from the Ministry of Science and Technology of Taiwan through grants 110-2112-M-001-006 (W.-H.W.), 108-2628-M-001-001-MY3 (L.L. and H.-Y.J.), and 110-2112-M-001-004 and 109-2112-M-001-005 (Y.-T.L.), and from Academia Sinica through Career Development Awards CDA-107-M03 (L.L. and H.-Y.J.) and CDA-106-M01 (Y.-T.L.). This work was conducted partially when W.-H.W. was visiting the CFHT as a resident astronomer. W.-H.W. is grateful for the hospitality of the CFHT ohana.
Funding AgencyGrant Number
Ministry of Science and Technology (Taipei)10-2112-M-001-006
Ministry of Science and Technology (Taipei)108-2628-M-001-001-MY3
Ministry of Science and Technology (Taipei)110-2112-M-001-004
Ministry of Science and Technology (Taipei)109-2112-M-001-005
Academia SinicaCDA-107-M03
Academia SinicaCDA-106-M01
Subject Keywords:Ultraviolet surveys; Galaxy evolution; Galaxy formation; High-redshift galaxies; Astronomy databases; Observational cosmology; Green valley galaxies
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Ultraviolet surveys (1742); Galaxy evolution (594); Galaxy formation (595); High-redshift galaxies (734); Astronomy databases (83); Observational cosmology (1146); Green valley galaxies (683)
Record Number:CaltechAUTHORS:20220725-156274000
Persistent URL:
Official Citation:Wei-Hao Wang et al 2022 ApJS 260 54
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115819
Deposited By: George Porter
Deposited On:27 Jul 2022 17:51
Last Modified:27 Jul 2022 17:51

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