A statistical hardness classification of ultraluminous X-ray sources using long-term Swift/XRT monitoring

arXiv:2609.31324 · astro-ph.HE · Submitted 2026-09-25 · Read on arXiv

astro-ph.HE

Submitted: 2026-09-25

Updated: 2026-09-25

Terminology

• Clustering — 36× in this paper · explained in 2 episodes
• Crossing Index — 8× in this paper
• Alternation — 3× in this paper · explained in 1 episode
• Principal Component Analysis — 3× in this paper
• Consistency — 2× in this paper · explained in 3 episodes
• Principal Component Analysis (PCA) — 2× in this paper · explained in 4 episodes
• Robustness — 2× in this paper · explained in 5 episodes
• Abundance — 1× in this paper · explained in 1 episode
• Accretion Physics — 1× in this paper · explained in 2 episodes
• Aperture — 1× in this paper · explained in 1 episode
• Calibration — 1× in this paper · explained in 7 episodes
• Swift X-Ray Telescope — 1× in this paper

Sources

• Ultra-luminous X-ray sources: extreme accretion and feedback

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