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Interpretation of IR variability of AGNs in the hollow bi-conical dust outflow model

Published online by Cambridge University Press:  28 October 2024

Victor L. Oknyansky Open the ORCID record for Victor L. Oknyansky [Opens in a new window]  and
C. Martin Gaskell
Victor L. Oknyansky*
Affiliation:
Department of Physics, Faculty of Natural Sciences, University of Haifa, Haifa 3498838, Israel Sternberg Astronomical Institute, M.V. Lomonosov Moscow State University, 119234, Moscow, Universitetsky pr-t, 13, Russia
C. Martin Gaskell*
Affiliation:
Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064
*
email: [email protected]
email: [email protected]
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Abstract

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We show that, contrary to simple predictions, most AGNs show at best only a small increase of lags with increasing wavelength in the J, H, K, and L bands. We suggest that a possible cause of this near simultaneity from the near-IR to the mid-IR is that the hot dust is in a hollow bi-conical outflow of which we preferentially see the near side. In the proposed model sublimation or re-creation of dust (with some delay relative luminosity variations) along our line of sight in the hollow cone as the flux varies could be a factor in explaining the AGN changing-look phenomenon (CL). Variations in the dust obscuration can help explain changes in relationship of Hβ time delay on Luv variability. The relative wavelength independence of IR lags simplifies the use of IR lags for estimating cosmological parameters.

Keywords

galaxies: activegalaxies: nucleigalaxies: Seyfertinfrared: optical and IR variabilitytime delaydustcosmology
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S378: Black Hole Winds at All Scales , December 2023 , pp. 3 - 7
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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