The bright-star masks for the HSC-SSP survey

PASJ: Publications of the Astronomical Society of Japan

Medezinski, Elinor¹  Coupon, Jean²  Miyazaki, Satoshi³  Bosch, James³  Czakon, Nicole⁴  Komiyama, Yutaka⁵  Oguri, Masamune⁵ 

[1] Department of Astronomy, School of Science, SOKENDAI (The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan;Department of Astronomy, University of Geneva, ch. d’Écogia 16, 1290 Versoix, Switzerland;Department of Astrophysical Sciences, 4 Ivy Lane, Princeton, NJ 08544, USA;Institute of Astronomy and Astrophysics, Academia Sinica, PO Box 23-141, Taipei 10617, Taiwan;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

关键词: galaxies: photometry;    cosmology: observations;    techniques: image processing;   

DOI  :  10.1093/pasj/psx047

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

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/〉.

【 授权许可】

CC BY