Browsing by Author "Arratia Carrasco, Vicente Alfonso"

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    Ether-fp: Exploring the Fundamental Plane of Black Hole Activity and Radio Emission Mechanisms in Active Galactic Nuclei.
    (Universidad de Concepción, 2024) Arratia Carrasco, Vicente Alfonso; Nagar, Neil Mark
    Recent improvements in millimeter (mm) very-long-baseline interferometry (VLBI) resolution and sensitivity have enabled the imaging of the innermost regions of supermassive black holes (SMBH), marking a new era in theoretical and observational research of active galactic nuclei (AGN). Motivated by these advancements, the Event Horizon and Environs (ETHER) sample has been created, and has grown into the largest catalog of SMBH to date. While many ETHER sources remain insufficiently explored, spectral energy distribution (SED) model fitting techniques, and empirical relations, can help provide necessary information to constrain observability prospects with the Event Horizon Telescope (EHT) and the Global mm-VLBI Array (GMVA). In this context, we aim to enhance ETHER by incorporating new data from the literature and databases, and leverage its large statistics to revisit the Fundamental Plane (FP) of black hole activity in multiple radio frequencies and subsamples. This effort seeks to deepen our understanding of the physical mechanisms governing radio-wave and hard X-ray emission from SMBH in various scenarios, and guide the usage of advection-dominated accretion flow (ADAF) or combined accretion-jet SED models for flux predictions at centimeter to sub-mm wavelengths. Weenrich ETHER with multi-frequency radio and hard X-ray photometry sourced from large catalogs (e.g., CSC, eRASS1, VLASS, and FIRST catalogues), supplemented with information obtained through automated queries to SDSS, SIMBAD, and NED. Using ordinary least squares linear regression models and numerical merit function minimization techniques, we calculate best-fit correlation coefficients and derive new radio/X-ray correlations and FPs across radio frequencies, AGN types, redshifts, galaxy morphologies, Eddington ratios, and radio-loudness values. Additionally, we develop and employ an SEDfitting algorithm involving phenomenological jet and/or semianalytical thermal ADAF emission models. Our analysis enabled us to confirm the existence of the FP across all radio frequencies tested, further validate its use as mass estimator at larger distances, encourage its use over the radio/X-ray correlation due to reduced scatter, understand why sample bias leads to diverse FPs, and find evidence of evolution across redshift and radio wavelength of the dominant radio emission mechanism. SED model fitting results generally favored the use of combined accretion-jet models over ADAF-only models for flux estimations. Ultimately, the findings and systems developed in this thesis have, and will, significantly improve our understanding of SMBH evolution across the universe, and define the “Gold” ETHER sample for EHT and GMVA studies.
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