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HYPERCALIBRATION: A PAN-STARRS1-BASED RECALIBRATION of the SLOAN DIGITAL SKY SURVEY PHOTOMETRY

  • Author(s): Finkbeiner, DP
  • Schlafly, EF
  • Schlegel, DJ
  • Padmanabhan, N
  • Jurić, M
  • Burgett, WS
  • Chambers, KC
  • Denneau, L
  • Draper, PW
  • Flewelling, H
  • Hodapp, KW
  • Kaiser, N
  • Magnier, EA
  • Metcalfe, N
  • Morgan, JS
  • Price, PA
  • Stubbs, CW
  • Tonry, JL
  • et al.

Published Web Location

https://arxiv.org/abs/1512.01214
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Abstract

© 2016. The American Astronomical Society. All rights reserved. We present a recalibration of the Sloan Digital Sky Survey (SDSS) photometry with new flat fields and zero points derived from Pan-STARRS1. Using point-spread function (PSF) photometry of 60 million stars with 16 < r < 20, we derive a model of amplifier gain and flat-field corrections with per-run rms residuals of 3 millimagnitudes (mmag) in griz bands and 15 mmag in u band. The new photometric zero points are adjusted to leave the median in the Galactic north unchanged for compatibility with previous SDSS work. We also identify transient non-photometric periods in SDSS ("contrails") based on photometric deviations co-temporal in SDSS bands. The recalibrated stellar PSF photometry of SDSS and PS1 has an rms difference of {9, 7, 7, 8} mmag in griz, respectively, when averaged over 15′ regions.

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