Milky Way Tomography with the SkyMapper Southern Survey. II. Photometric Re-calibration of SMSS DR2
Yang Huang, Haibo Yuan, Chengyuan Li, Christian Wolf, Christopher A., Onken, Timothy C. Beers, Luca Casagrande, Dougal Mackey, Gary S. Da Costa,, Joss Bland-Hawthorn, Dennis Stello, Thomas Nordlander, Yuan-Sen Ting, Sven, Buder, Sanjib Sharma, Xiaowei Liu

TL;DR
This paper presents a precise photometric re-calibration of SMSS DR2 using a spectroscopy-based stellar-color regression method, revealing zero-point offsets related to dust extinction and spatial variations, confirmed by independent checks.
Contribution
It introduces an improved SCR-based calibration method for SMSS DR2, correcting zero-point offsets influenced by dust and spatial effects, enhancing photometric accuracy.
Findings
Zero-point offsets in SMSS DR2 are linked to dust extinction effects.
Spatial variations in zero-points are detected across the survey.
Independent checks confirm the revised zero-points.
Abstract
We apply the spectroscopy-based stellar-color regression (SCR) method to perform an accurate photometric re-calibration of the second data release from the SkyMapper Southern Survey (SMSS DR2). From comparison with a sample of over 200,000 dwarf stars with stellar atmospheric parameters taken from GALAH+ DR3 and with accurate, homogeneous photometry from DR2, zero-point offsets are detected in the original photometric catalog of SMSS DR2, in particular for the gravity- and metallicity-sensitive bands. For bands, the zero-point offsets are close to zero at very low extinction, and then steadily increase with , reaching as large as 0.174 and 0.134 mag respectively, at mag. These offsets largely arise from the adopted dust term in the transformations used by SMSS DR2 to construct photometric calibrators from the ATLAS reference catalog. For…
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