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  1. Request For Comments
  2. RFC-337

Add HSC Bright Object Masks to /datasets/hsc

    Details

    • Type: RFC
    • Status: Implemented
    • Resolution: Done
    • Component/s: DM
    • Labels:
      None

      Description

      The HSC team has a set of bright object masks that are provided externally and
      can be applied in AssembleCoaddTask to mask bright stars and other troublesome objects. I would like to add the bright object masks of version "Arcturus" to the /datasets/hsc root butler repo, so they can be used more easily.

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            Hide
            price Paul Price added a comment -

            It should be known that the author of the bright star masks is Jean Coupon, who has a paper describing their creation coming out on the arXiv in the next day or two.

            Show
            price Paul Price added a comment - It should be known that the author of the bright star masks is Jean Coupon, who has a paper describing their creation coming out on the arXiv in the next day or two.
            Hide
            price Paul Price added a comment - - edited

            arXiv:1705.00622
            Date: Mon, 1 May 2017 18:00:02 GMT (10044kb,D)

            Title: The bright-star masks for the HSC-SSP survey
            Authors: Jean Coupon, Nicole Czakon, James Bosch, Yutaka Komiyama, Elinor
            Medezinski, Satoshi Miyazaki and Masamune Oguri
            Categories: astro-ph.IM
            Comments: 20 pages, 17 figures, submitted to PASJ
            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
            G_Gaia < 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 G_Gaia < 18. Second, we build the
            mask regions in an automated way using stacked detected source measurements
            around bright stars binned per G_Gaia magnitude. Finally, we validate
            those masks from 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 this
            address: ftp://obsftp.unige.ch/pub/coupon/brightStarMasks/HSC-SSP/.
            ( https://arxiv.org/abs/1705.00622 , 10044kb)

            Show
            price Paul Price added a comment - - edited arXiv:1705.00622 Date: Mon, 1 May 2017 18:00:02 GMT (10044kb,D) Title: The bright-star masks for the HSC-SSP survey Authors: Jean Coupon, Nicole Czakon, James Bosch, Yutaka Komiyama, Elinor Medezinski, Satoshi Miyazaki and Masamune Oguri Categories: astro-ph.IM Comments: 20 pages, 17 figures, submitted to PASJ 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 G_Gaia < 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 G_Gaia < 18. Second, we build the mask regions in an automated way using stacked detected source measurements around bright stars binned per G_Gaia magnitude. Finally, we validate those masks from 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 this address: ftp://obsftp.unige.ch/pub/coupon/brightStarMasks/HSC-SSP/ . ( https://arxiv.org/abs/1705.00622 , 10044kb)
            Hide
            hchiang2 Hsin-Fang Chiang added a comment -

            Data have been downloaded using a link provided by Paul Price.
            The total size of all patches is ~8.7GB.
            The patches of these Bright Object Masks are added to /datasets/hsc/repo/deepCoadd/ (DM-10436).

            Show
            hchiang2 Hsin-Fang Chiang added a comment - Data have been downloaded using a link provided by Paul Price . The total size of all patches is ~8.7GB. The patches of these Bright Object Masks are added to /datasets/hsc/repo/deepCoadd/ ( DM-10436 ).

              People

              • Assignee:
                hchiang2 Hsin-Fang Chiang
                Reporter:
                hchiang2 Hsin-Fang Chiang
                Watchers:
                Hsin-Fang Chiang, John Swinbank, Paul Price
              • Votes:
                1 Vote for this issue
                Watchers:
                3 Start watching this issue

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                • Created:
                  Updated:
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