Exploring black hole scaling relations via the ensemble variability of active galactic nuclei
| Autor: | I. E. Papadakis, Maurizio Paolillo, Antonis Georgakakis |
|---|---|
| Přispěvatelé: | Georgakakis, A., Papadakis, I., Paolillo, M. |
| Rok vydání: | 2021 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Active galactic nucleus Accretion (meteorology) Stellar mass Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galaxies: active - Galaxies: nuclei - quasars: supermassive black holes – X-rays: general Redshift Galaxy Luminosity Black hole galaxies: active galaxies: nuclei quasars: supermassive black holes X-rays: general Astrophysics - High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology Amplitude Space and Planetary Science Astrophysics - High Energy Astrophysical Phenomena Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 508:3463-3473 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | An empirical model is presented that links the demographics of AGN to their ensemble X-ray variability properties. Observations on the incidence of AGN in galaxies are combined with (i) models of the Power Spectrum Density (PSD) of the flux variations of AGN and (ii) parameterisations of the black-hole mass vs stellar-mass scaling relation, to predict the mean excess variance of active black-hole populations in cosmological volumes. We show that the comparison of the model with observational measurements of the ensemble excess variance as a function of X-ray luminosity provides a handle on both the PSD models and the black-hole mass vs stellar mass relation. We find strong evidence against a PSD model that is described by a broken power-law and a constant overall normalisation. Instead our analysis indicates that the amplitude of the PSD depends on the physical properties of the accretion events, such as the Eddington ratio and/or the black hole mass. We also find that current observational measurements of the ensemble excess variance are consistent with the black-hole mass vs stellar mass relation of local spheroids based on dynamically determined black-hole masses. We also discuss future prospects of the proposed approach to jointly constrain the PSD of AGN and the black-hole mass vs stellar mass relation as a function of redshift. The mock AGN catalogue used in the paper is made available. The contents are described in the README file. The code used in the paper is available at https://github.com/ageorgakakis/EnsembleVariability. Full details can be found in the associated paper at https://arxiv.org/abs/2105.08752. The code that uses this data is available at https://github.com/ageorgakakis/EnsembleVariability The paper describing the modeling approach is available at https://arxiv.org/abs/2105.08752 {"references":["https://arxiv.org/abs/2105.08752"]} |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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