Hypercalibration: A Pan-STARRS1-based recalibration of the Sloan Digital Sky Survey
| Autor: | Finkbeiner, Douglas P., Schlafly, Edward F., Schlegel, David J., Padmanabhan, Nikhil, Juric, Mario, Burgett, William S., Chambers, Kenneth C., Denneau, Larry, Draper, Peter W., Flewelling, Heather, Hodapp, Klaus W., Kaiser, Nick, Magnier, E. A., Metcalfe, N., Morgan, Jeffrey S., Price, Paul A., Stubbs, Christopher W., Tonry, John L. |
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| Rok vydání: | 2015 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/0004-637X/822/2/66 |
| Popis: | We present a recalibration of the Sloan Digital Sky Survey (SDSS) photometry with new flat fields and zero points derived from Pan-STARRS1 (PS1). Using 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. Comment: 13 pages, 7 figures, ApJ, in press. "Hypercalibration" refers to using repeat measurements of many stars from multiple surveys to constrain calibration parameters |
| Databáze: | arXiv |
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