XGBoost classifier filters interlopers in CSST slitless spectroscopy simulations, retaining 42% of galaxies with 96.6% accurate redshifts and 0.13% outliers.
Testing photometric redshift measurements with filter definition of the Chinese Space Station Optical Survey (CSS-OS)
3 Pith papers cite this work. Polarity classification is still indexing.
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abstract
The Chinese Space Station Optical Survey (CSS-OS) is a major science project of the Space Application System of the China Manned Space Program. This survey is planned to perform both photometric imaging and slitless spectroscopic observations, and it will focus on different cosmological and astronomical goals. Most of these goals are tightly dependent on the accuracy of photometric redshift (photo-z) measurement, especially for the weak gravitational lensing survey as a main science driver. In this work, we assess if the current filter definition can provide accurate photo-z measurement to meet the science requirement. We use the COSMOS galaxy catalog to create a mock catalog for the CSS-OS. We compare different photo-z codes and fitting methods that using the spectral energy distribution (SED) template-fitting technique, and choose to use a modified LePhare code in photo-z fitting process. Then we investigate the CSS-OS photo-z accuracy in certain ranges of filter parameters, such as band position, width, and slope. We find that the current CSS-OS filter definition can achieve reasonably good photo-z results with sigma_z~0.02 and outlier fraction ~3%.
years
2026 3representative citing papers
Revised SDSS ugriz zero-points obtained by inverting IRFM on 6000+ FGK stars to match an adopted temperature scale, with largest offset in u band depending on filter curves.
New empirical color-Teff calibrations in the SDSS system from IRFM temperatures of 3902 GALAH and 2535 APOGEE stars, with 30-50 K precision for long-baseline colors.
citing papers explorer
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Filtering Interlopers with Photometry and Diagnostic Features: A Machine Learning Framework Validated with CSST Slitless Spectroscopy
XGBoost classifier filters interlopers in CSST slitless spectroscopy simulations, retaining 42% of galaxies with 96.6% accurate redshifts and 0.13% outliers.
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Recalibration of SDSS photometric zero-points based on the InfraRed Flux Method temperature scale
Revised SDSS ugriz zero-points obtained by inverting IRFM on 6000+ FGK stars to match an adopted temperature scale, with largest offset in u band depending on filter curves.
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Empirical colour--effective temperature relations in the SDSS system from IRFM temperatures of GALAH and APOGEE stars
New empirical color-Teff calibrations in the SDSS system from IRFM temperatures of 3902 GALAH and 2535 APOGEE stars, with 30-50 K precision for long-baseline colors.