Browsing by Author "Ezequiel Treister"

Now showing 1 - 4 of 4
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    AGNs and their host galaxies in the local universe : two mass-independent Eddington ratio distribution functions characterize black hole growth.
    (2017) Weigel, Anna; Ezequiel Treister; Schawinski, Kevin; Caplar, Neven; Wong, O. Ivy; Trakhtenbrot, Benny
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    ALMA [C i]3P1–3P0 Observations of NGC 6240: A Puzzling Molecular Outflow, and the Role of Outflows in the Global αCO Factor of (U)LIRGs
    (2018) Cicone, Claudia; Ezequiel Treister; Severgnini, Paola; Papadopoulos, Padelis P.; Maiolino, Roberto; Feruglio, Chiara; Privon, George C.; Zhang, Z.; Della Ceca, Roberto; Fiore, Fabrizio
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    BASS. XXX. Distribution Functions of DR2 Eddington Ratios, Black Hole Masses, and X-Ray Luminosities
    (2022) Ananna, Tonima Tasnim ; Weigel, Anna K. ; Trakhtenbrot, Benny ; Koss, Michael J. ; Urry, C. Megan ; Ricci, Claudio; Hickox, Ryan C. ; Ezequiel Treister; Bauer, Franz E. ; Ueda, Yoshihiro ; Mushotzky, Richard ; Ricci, Federica ; Oh, Kyuseok ; Mejía-Restrepo, Julian E. ; Den Brok, Jakob ; Stern, Daniel ; Powell, Meredith C. ; Caglar, Turgay ; Ichikawa, Kohei ; Wong, O. Ivy ; Harrison, Fiona A. ; Schawinski, Kevin
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    Insights for Early Massive Black Hole Growth from JWST Detection of the [Ne v] λ3427 Emission Line
    (2025) Benny Trakhtenbrot; Claudio Ricci; Ezequiel Treister; Michael J. Koss; Richard Mushotzky; Kyuseok Oh; Alessandro Peca; Franz E. Bauer; Kriti Kamal Gupta; Tomer Reiss
    We use the narrow [Ne v] λ3427 emission line detected in the recently published JWST spectra of two galaxies, at z ≃ 6.9 and 5.6, to study the key properties of the active galactic nuclei (AGN) and the supermassive black holes (SMBHs) in their centers. Using a new empirical scaling linking the [Ne V] line emission with AGN accretiondriven (continuum) emission, derived from a highly complete low-redshift AGN sample, we show that the [Ne V] emission in the two z > 5 galaxies implies total (bolometric) AGN luminosities of order Lbol ≈ (4–8) × 1045 erg s −1 . Assuming that the radiation emitted from these systems is Eddington limited, the (minimal) black hole (BH) masses are of order MBH ≳ 107 M⊙. Combined with the published stellar masses of the galaxies, estimated from dedicated fitting of their spectral energy distributions, the implied BH-to-stellar mass ratios are of order MBH/Mhost ≈ 0.1–1. This is considerably higher than what is found in the local Universe, but is consistent with the general trend seen in some other z ≳ 5 AGN. Given the intrinsic weakness of the [Ne V] line and the nature of the [Ne V] –to–Lbol scaling, any (rare) detection of the [Ne v] λ3427 line at z > 5 would translate to similarly high AGN luminosities and SMBH masses, thus providing a unique observational path for studying luminous AGN well into the epoch of reionization, including obscured sources.