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This paper describes a method to estimate the reddening of AGN using various methods, mostly to do with the intensity ratios of different absorption lines. It also mentions the Chołoniewski method, which is used to describe the luminosity function:

Chołoniewski (1981) made the important discovery that if the apparent brightnesses of an AGN in different passbands – for example, the fluxes FB and FV in the Johnson B and V bands are plotted against each other as fluxes rather than as magnitudes, the curvature seen when plotting in magnitudes disappears.

Reading the original paper doesn't enlighten me as to what the Chołoniewski method actually is, or why it's important. Can someone please help me understand the method?

EDIT: it makes a lot more sense now that I'm looking at the right paper! Thanks Peter Erwin (comments).

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  • $\begingroup$ You're looking at the wrong paper by Chołoniewski. The references to "the Chołoniewski method" in Gaskell et al. (2023) is to Chołoniewski 1981, not the 1986 paper you've linked to. $\endgroup$ Commented Feb 1, 2023 at 20:37
  • $\begingroup$ Thanks! Edited. $\endgroup$
    – Jim421616
    Commented Feb 2, 2023 at 3:15

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