Showing 1 - 20 results of 173 for search '"quasars"', query time: 0.05s Refine Results
  1. 1

    The cosmic timeline implied by the highest redshift quasars by Fulvio Melia

    Published 2024-12-01
    “…Abstract The conventional picture of supermassive black-hole growth in the standard model had already been seriously challenged by the emergence of $$\sim 10^9\;M_\odot $$ ∼ 10 9 M ⊙ quasars at $$z\sim 7.5$$ z ∼ 7.5 , conflicting with the predicted formation of structure in the early $$\varLambda $$ Λ CDM Universe. …”
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  2. 2

    The Low-Mass End of the MBH/Mhost Relation in Quasars by Roberto Decarli, Renato Falomo, Jari K. Kotilainen, Tomi Hyvönen, Michela Uslenghi, Aldo Treves

    Published 2012-01-01
    “…The MBH-Mhost relation in quasars has been probed only in a limited parameter space, namely, at MBH∼109 M⊙ and Mhost∼1012  M⊙. …”
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  3. 3

    The quasars’ redshift estimation method based on piecewise Gaussian fitting by Yanrui Su, Li Zhang, Bin Jiang, Jiaqi Liu, Fabao Yan

    Published 2019-05-01
    “…To solve the problem that high-redshift and broad emission lines weaken the quasar discovery and observation severely, a new redshift calculation method based on piecewise Gaussian fitting is proposed. …”
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