What question did this study set out to answer?

This research aims to explore the statistical properties of ISP blazar variability and identify a distinct subpopulation characterized by high variability.

April 28, 2026Open Access

Statistical Substructure of ISP Blazar Variability: Evidence for a Distinct High-Variability Population in 4LAC-DR3 (v5: Full Paper with DOCX)

Key Points

This research aims to explore the statistical properties of ISP blazar variability and identify a distinct subpopulation characterized by high variability.
Utilized Gaussian Mixture Models (GMM) to identify the C3 subpopulation among ISP blazars (N=129) in the 4LAC-DR3 dataset.
Conducted statistical tests (KS tests) to confirm spectral softening in specific blazars (ON 246 and 3C 66A).
Analyzed shared physical signatures among blazars with varying variability characteristics.
Identified a distinct high-variability ISP blazar subpopulation (C3) within the 4LAC-DR3 dataset.
Confirmed spectral softening in ON 246 (KS p=7.5e-4) and 3C 66A (KS p=1.15e-13) with significant photon counts (27,059) in the latter.
Found shared physical signatures indicative of varying characteristics across different blazar populations.

Abstract

Complete paper (Markdown + DOCX) on the C3 high-variability ISP blazar subpopulation. v5 adds the formatted DOCX version of the full paper. Key results: GMM identification of C3 (N=129, 4LAC-DR3); spectral softening confirmed in ON 246 (KS p=7.5e-4) and 3C 66A (KS p=1.15e-13, 27,059 photons); shared physical signature across different variability characters. OSF: https://osf.io/7b5t2

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