NGC 1142’s NH varies across nine epochs; detection probability scales with observation count, and simple cloud simulations favor many simultaneous eclipsing clouds.
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X-ray Absorption Variability in NGC 1142: Another Constraint on the Nature of the Torus/Broad-Line Region in Active Galactic Nuclei
NGC 1142’s NH varies across nine epochs; detection probability scales with observation count, and simple cloud simulations favor many simultaneous eclipsing clouds.