@article{55920755bc6d42a49a49da31263f98c9,
title = "On spin dependence of the fundamental plane of black hole activity",
abstract = "The Fundamental Plane (FP) of black hole (BH) activity in galactic nuclei relates X-ray and radio luminosities to BH mass and accretion rate. However, there is a large scatter exhibited by the data, which motivated us for a new variable. We add BH spin as a new variable and estimate the spin dependence of the jet power and disc luminosity in terms of radio and X-ray luminosities. We assume the Blandford–Znajek process as the main source of the outflow, and find that the jet power depends on BH spin stronger than quadratically at moderate and large spin values. We perform a statistical analysis for 10 active galactic nuclei (AGNs) which have sub-Eddington accretion rates and whose spin values are measured independently via the reflection or continuum-fitting methods, and find that the spin-dependent relation describes the data significantly better. This analysis, if supported with more data, could imply not only the spin dependence of the FP relation, but also the Blandford–Znajek process in AGN jets.",
keywords = "Accretion, Accretion discs, Black hole physics, Galaxies: Jets, Quasars: Individual: Supermassive black holes",
author = "Caner {\"U}nal and Abraham Loeb",
note = "Funding Information: We would like to thank Ruth Daly, Kazım Yavuz Ek{\c s}i, Charles Gammie, Gabriele Ghisellini, Kianusch Mehrgan, Coleman Miller, Roberto Oliveri, Gizem {\c S}eng{\"o}r, Bayram Tekin, and Federico Urban for discussions on a variety of topics; Tansu Daylan and St{\'e}phane Ili{\'c} for the statistical analysis; and Ivan Almeida, Heino Falcke, Kayhan G{\"u}ltekin, Sebastian Heinz, Elmar K{\"o}rding, Sera Markoff, Richard Plotkin, and Gustavo Soares for their comments on the manuscript. We also would like to thank anonymous referee for her/his comments. C{\"U} thanks {\"O}mer and Hamiyet {\"U}nal for their support and encouragement throughout this work, and Jeroen Wienk for hosting and helping him in Nijmegen in the chaotic days of the COVID-19 spread. C{\"U} thanks Harvard University, Munich Institute for Astro and Particle Physics (MIAPP), and the organizers and participants of the workshop Precision Gravity: From the LHC to LISA, International Center for Theoretical Physics (ICTP), Galileo Galilei Institute for Theoretical Physics (GGI), Middle East Technical University (METU), and University of Geneva for their kind hospitality during the progress of this work, and acknowledges the hospitality of the DSI G{\"o}lk{\"o}y Egitim Tesisleri personnel. C{\"U} was supported by European Structural and Investment Funds and the Czech Ministry of Education, Youth and Sports (Project CoGraDS - CZ.02.1.01/0.0/0.0/15 003/0000437), and partially supported by ICTP, GGI, MIAPP (funded by the Deutsche Forschungsgemeinschaft, German Research Foundation, under Germany{\textquoteright}s Excellence Strategy - EXC-2094 - 390783311.), and Swiss National Science Foundation (via project The Non-Gaussian Universe and Cosmological Symmetries, project number: 200020-178787). AL was supported in part by the Black Hole Initiative at Harvard University, which is funded by grants from JTF and GBMF. Publisher Copyright: {\textcopyright} 2020 The Author(s).",
year = "2020",
month = jun,
day = "1",
doi = "10.1093/mnras/staa1119",
language = "English",
volume = "495",
pages = "278--284",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",
}