Statistical Substructure of ISP Blazar Variability: Evidence for a Distinct High-Variability Population in 4LAC-DR3 (v4: 3C 66A Confirmation)

Yoshimitsu Katayama

doi:10.5281/zenodo.19788110

April 26, 2026Open Access

Statistical Substructure of ISP Blazar Variability: Evidence for a Distinct High-Variability Population in 4LAC-DR3 (v4: 3C 66A Confirmation)

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Key Points

This research aims to identify distinct variability patterns within a specific subgroup of ISP blazars from the 4LAC-DR3 catalog.
Analyzed 515 ISP blazar sources using Gaussian Mixture Model (GMM) to distinguish high-variability subpopulation (C3) with N=129.
Conducted individual Swift X-ray Telescope (XRT) analysis of 3C 66A, including 27,059 photons over 69.7 hours.
Performed cross-source spectral analysis to compare variability characters and signatures among C3 members.
Identified the C3 high-variability subpopulation showing 2-4x excess fractional variability, independent of observational biases.
Confirmed X-ray spectral softening in 3C 66A with a KS test p-value of 1.15e-13, supporting previous findings.
Cross-source comparisons reveal consistent spectral signatures among C3 members despite differing variability characteristics.

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Implication

Identifies high-variability blazar subpopulation, suggesting shared physical characteristics.

Abstract

We report identification of a statistically distinct high-variability subpopulation (C3) among ISP blazars in 4LAC-DR3. GMM on 515 sources identifies C3 (N=129) with 2-4x excess fractional variability independent of observational biases. New in v4: Individual Swift XRT analysis of 3C 66A (27,059 photons, 69.7h) confirms intra-observation X-ray spectral softening (KS p=1.15e-13), independently replicating the ON 246 result (KS p=7.5e-4). Cross-source comparison shows shared spectral signatures despite differing variability characters, supporting a common physical state for C3 members.

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Yoshimitsu Katayama (2026) studied this question.

synapsesocial.com/papers/69f04e30727298f751e7232e https://doi.org/10.5281/zenodo.19788110

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Statistical Substructure of ISP Blazar Variability: Evidence for a Distinct High-Variability Population in 4LAC-DR3 (v4: 3C 66A Confirmation)

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Statistical Substructure of ISP Blazar Variability: Evidence for a Distinct High-Variability Population in 4LAC-DR3 (v4: 3C 66A Confirmation)

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