ORCID Profile
0000-0001-7925-238X
Current Organisation
University of Tokyo
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Publisher: Oxford University Press (OUP)
Date: 10-04-2012
Publisher: Oxford University Press (OUP)
Date: 06-09-2013
Publisher: Oxford University Press (OUP)
Date: 11-2012
DOI: 10.1093/MNRAS/STS075
Publisher: Oxford University Press (OUP)
Date: 24-11-2022
Abstract: We infer the expected detection number of pair instability supernovae (PISNe) during the operation of the Euclid space telescope based on binary population models. Our models reproduce the global maximum at the primary BH mass of ∼9–10 M⊙ and the overall gradient of the primary BH mass distribution in the binary BH merger rate consistent with recent observations. We consider different PISN conditions depending on the 12C(α, γ)16O reaction rate. The fiducial and 3σ models adopt the standard and 3σ smaller reaction rates, respectively. Our fiducial model predicts that Euclid detects several hydrogen-poor PISNe. For the 3σ model, detection of ∼1 hydrogen-poor PISN by Euclid is expected if the stellar mass distribution extends to Mmax = 600 M⊙, but the expected number becomes significantly smaller if Mmax = 300 M⊙. We may be able to distinguish the fiducial and 3σ models by the observed PISN rate. This will help us to constrain the origin of binary BHs and the reaction rate, although there remains a degeneracy between Mmax and the reaction rate. PISN ejecta mass estimates from light curves and spectra obtained by follow-up observations would be important to disentangle the degeneracy.
Publisher: Cambridge University Press (CUP)
Date: 2019
DOI: 10.1017/PASA.2019.14
Abstract: In recent years, the discovery of massive quasars at $z\\sim7$ has provided a striking challenge to our understanding of the origin and growth of supermassive black holes in the early Universe. Mounting observational and theoretical evidence indicates the viability of massive seeds, formed by the collapse of supermassive stars, as a progenitor model for such early, massive accreting black holes. Although considerable progress has been made in our theoretical understanding, many questions remain regarding how (and how often) such objects may form, how they live and die, and how next generation observatories may yield new insight into the origin of these primordial titans. This review focusses on our present understanding of this remarkable formation scenario, based on the discussions held at the Monash Prato Centre from November 20 to 24, 2017, during the workshop ‘ Titans of the Early Universe: The Origin of the First Supermassive Black Holes ’.
Publisher: Oxford University Press (OUP)
Date: 26-04-2016
DOI: 10.1093/PASJ/PSW029
No related grants have been discovered for Naoki Yoshida.