Correcting the fiber-aperture bias affecting galaxy stellar populations in the Legacy Sloan Digital Sky Survey. Aperture corrections to absorption indices based on CALIFA integral field observations

February 18, 2026

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Key Points

Quantify the effects of fiber aperture on stellar population measurements in local galaxies using SDSS data.
Utilized CALIFA integral-field spectroscopy for simulating fiber-fed observations.
Accounted for seeing effects across a redshift range of z = 0.005 to 0.4.
Derived correction recipes based on various spectral indices and galaxy properties.
Aperture corrections typically reach ≳ 15% at z ∼ 0.02, decreasing with higher redshift.
Corrections significantly reduce scatter in stellar population diagnostics and enhance bimodality in age-sensitive diagrams.
Showed overestimates of old galaxy fractions by up to 10% and underestimates of the transition luminosity.

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This analysis quantifies fiber aperture effects on stellar populations in local galaxies, suggesting necessary corrections.

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Zibetti et al. (2026) studied this question.

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