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  Testing the disk-corona interplay in radiatively-efficient broad-line AGN

Arcodia, R., Merloni, A., Nandra, K., & Ponti, G. (2019). Testing the disk-corona interplay in radiatively-efficient broad-line AGN. Astronomy and Astrophysics, 628: A135. doi:10.1051/0004-6361/201935874.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-38EF-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-38F0-D
Genre: Journal Article

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Arcodia, R.1, Author              
Merloni, A.1, Author              
Nandra, K.1, Author              
Ponti, G.1, Author              
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1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: The correlation observed between monochromatic X-ray and UV luminosities in radiatively-efficient active galactic nuclei (AGN) lacks a clear theoretical explanation despite being used for many applications. Such a correlation, with its small intrinsic scatter and its slope that is smaller than unity in log space, represents the compelling evidence that a mechanism regulating the energetic interaction between the accretion disk and the X-ray corona must be in place. This ensures that going from fainter to brighter sources the coronal emission increases less than the disk emission. We discuss here a self-consistently coupled disk-corona model that can identify this regulating mechanism in terms of modified viscosity prescriptions in the accretion disk. The model predicts a lower fraction of accretion power dissipated in the corona for higher accretion states. We then present a quantitative observational test of the model using a reference sample of broad-line AGN and modeling the disk-corona emission for each source in the LX − LUV plane. We used the slope, normalization, and scatter of the observed relation to constrain the parameters of the theoretical model. For non-spinning black holes and static coronae, we find that the accretion prescriptions that match the observed slope of the LX − LUV relation produce X-rays that are too weak with respect to the normalization of the observed relation. Instead, considering moderately-outflowing Comptonizing coronae and/or a more realistic high-spinning black hole population significantly relax the tension between the strength of the observed and modeled X-ray emission, while also predicting very low intrinsic scatter in the LX − LUV relation. In particular, this latter scenario traces a known selection effect of flux-limited samples that preferentially select high-spinning, hence brighter, sources.

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 Dates: 2019-05-12
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201935874
Other: LOCALID: 3177145
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 628 Sequence Number: A135 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1