Journal Article

The bright-star masks for the HSC-SSP survey

Jean Coupon, Nicole Czakon, James Bosch, Yutaka Komiyama, Elinor Medezinski, Satoshi Miyazaki and Masamune Oguri

in Publications of the Astronomical Society of Japan

Volume 70, issue SP1 Published in print January 2018 | ISSN: 0004-6264
Published online July 2017 | e-ISSN: 2053-051X | DOI: https://dx.doi.org/10.1093/pasj/psx047
The bright-star masks for the HSC-SSP survey

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  • Cosmology
  • Galaxies
  • Astronomical Instrumentation, Methods, and Techniques

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Abstract

We present the procedure to build and validate the bright-star masks for the Hyper-Suprime-Cam Strategic Subaru Proposal (HSC-SSP) survey. To identify and mask the saturated stars in the full HSC-SSP footprint, we rely on the Gaia and Tycho-2 star catalogues. We first assemble a pure star catalogue down to GGaia < 18 after removing ∼1.5% of sources that appear extended in the Sloan Digital Sky Survey (SDSS). We perform visual inspection on the early data from the S16A internal release of HSC-SSP, finding that our star catalogue is 99.2% pure down to GGaia < 18. Second, we build the mask regions in an automated way using stacked detected source measurements around bright stars binned per GGaia magnitude. Finally, we validate those masks by visual inspection and comparison with the literature of galaxy number counts and angular two-point correlation functions. This version (Arcturus) supersedes the previous version (Sirius) used in the S16A internal and DR1 public releases. We publicly release the full masks and tools to flag objects in the entire footprint of the planned HSC-SSP observations at 〈ftp://obsftp.unige.ch/pub/coupon/brightStarMasks/HSC-SSP/〉.

Keywords: cosmology: observations; galaxies: photometry; techniques: image processing

Journal Article.  10654 words.  Illustrated.

Subjects: Cosmology ; Galaxies ; Astronomical Instrumentation, Methods, and Techniques

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