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Survey reveals a rare spectral hardening in ISP BL Lac objects, suggesting new classifications for cosmic sources.
We present the first complete X-ray spectral survey of all 347 ISP BL Lac objects in the 4LAC-DR3 high-confidence catalog using archival Swift-XRT data. Of 347 targets, 242 had sufficient data, yielding 220 Class-S and 14 Class-H objects. Only 1WGA J0506.6-0857 exhibits statistically significant spectral hardening (p=0.037, beta=2.11). Results are interpreted under the delta-P_Ma Hypothesis (Katayama 2026). ORCID: 0009-0006-2290-6593 | TheYKHC Independent Research Institute
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Yoshimitsu Katayama (2026) studied this question.
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