What question did this study set out to answer?

The study aims to analyze the cross-correlation of light curves from the blazar PKS 0208-512 using multiwavelength data.

February 24, 2026

Multiwavelength Cross-Correlation Using Millimeter AGN Light Curves from the Atacama Cosmology Telescope

Key Points

The study aims to analyze the cross-correlation of light curves from the blazar PKS 0208-512 using multiwavelength data.
Conducted a pilot cross-correlation analysis between millimeter, optical, and gamma-ray data.
Utilized the Atacama Cosmology Telescope and millimeter data from the Atacama Large Millimeter Array.
Employed data from the All-Sky Automated Survey for Supernovae and Fermi Large Area Telescope.
Reported a near-zero time-lag between optical and gamma-ray emissions, supporting leptonic emission models.
Found that millimeter emission lags by a few weeks, indicating its origin from a downstream region of the jet.
Highlighted the potential for using over 200 blazar light curves in future time-domain studies.

Abstract

We present a pilot multiwavelength cross-correlation analysis of the blazar PKS 0208-512 between 2018 and 2023 using millimeter data from the Atacama Cosmology Telescope (ACT) and the Atacama Large Millimeter Array, optical data from the All-Sky Automated Survey for Supernovae, and γ-ray data from the Fermi Large Area Telescope. We report a near-zero time-lag between the optical and γ-ray bands, consistent with leptonic emission models, while the millimeter emission lags by a few weeks, suggesting millimeter emission originates from farther downstream in the jet. With the upcoming release of an ACT catalogue containing over 200 blazar light curves, these results highlight the potential of these light curves for time-domain active galactic nuclei studies and provide a foundation for extending this analysis to a larger blazar sample.

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