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The Physical Relation between Disc and Coronal Emission in Quasars

Lusso, Elisabeta; Risaliti, Guido

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Authors

Guido Risaliti



Abstract

We propose a modified version of the observed non-linear relation between the X-ray (2 keV) and the ultraviolet (2,500 Å) emission in quasars (i.e., LX∝LγUV) which involves the full width at half-maximum, FWHM, of the broad emission line, i.e., LX∝LγˆUV FWHMβˆ. By analyzing a sample of 550 optically selected non-jetted quasars in the redshift range of 0.36–2.23 from the Sloan Digital Sky Survey cross matched with the XMM-Newton catalog 3XMM-DR6, we found that the additional dependence of the observed LX − LUV correlation on the FWHM of the MgII broad emission line is statistically significant. Our statistical analysis leads to a much tighter relation with respect to the one neglecting FWHM, and it does not evolve with redshift. We interpret this new relation within an accretion disc corona scenario where reconnection and magnetic loops above the accretion disc can account for the production of the primary X-ray radiation. For a broad line region size depending on the disc luminosity as Rblr∝L0.5disc, we find that LX∝L4/7UV FWHM4/7, which is in very good agreement with the observed correlation.

Citation

Lusso, E., & Risaliti, G. (2018). The Physical Relation between Disc and Coronal Emission in Quasars. Frontiers in Astronomy and Space Sciences, 4, Article 66. https://doi.org/10.3389/fspas.2017.00066

Journal Article Type Article
Acceptance Date Dec 18, 2017
Online Publication Date Jan 8, 2018
Publication Date Jan 8, 2018
Deposit Date Apr 13, 2018
Publicly Available Date Apr 13, 2018
Journal Frontiers in Astronomy and Space Sciences
Publisher Frontiers Media
Peer Reviewed Peer Reviewed
Volume 4
Article Number 66
DOI https://doi.org/10.3389/fspas.2017.00066

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
© 2018 Lusso and Risaliti. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.





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