Ji-Jia Tang
Rapid Black Hole Growth at the Dawn of the Universe: Super-Eddington Quasar at z=6.6
Tang, Ji-Jia; Goto, Tomotsugu; Ohyama, Youichi; Jin, Chichuan; Done, Chris; Lu, Ting-Yi; Hashimoto, Tetsuya; Eser, Ece Kilerci; Chiang, Chia-Ying; Kim, Seong Jin
Authors
Tomotsugu Goto
Youichi Ohyama
Chichuan Jin
Professor Christine Done chris.done@durham.ac.uk
Professor
Ting-Yi Lu
Tetsuya Hashimoto
Ece Kilerci Eser
Chia-Ying Chiang
Seong Jin Kim
Abstract
We present the analysis of a new near-infrared (NIR) spectrum of a recently discovered z = 6.621 quasar PSO J006 + 39 in an attempt to explore the early growth of supermassive black holes (SMBHs). This NIR (rest-frame ultraviolet, UV) spectrum shows blue continuum slope and rich metal emission lines in addition to Lyα line. We utilize the MgII line width and the rest-frame luminosity L3000A˚ to find the mass of SMBH (MBH) to be ∼108M⊙, making this one of the lowest mass quasars at high redshift. The power-law slope index (αλ) of the continuum emission is −2.94 ± 0.03, significantly bluer than the slope of αλ = −7/3 predicted from standard thin disc models. We fit the spectral energy distribution (SED) using a model which can fit local SMBHs, which includes warm and hot Comptonization powered by the accretion flow as well as an outer standard disc. The result shows that the very blue slope is probably produced by a small radial (∼230 gravitational radius, Rg) extent of the standard accretion disc. All plausible SED models require that the source is super-Eddington (Lbol/LEdd ≳ 9), so the apparently small disc may simply be the inner funnel of a puffed up flow, and clearly the SMBH in this quasar is in a rapid growth phase. We also utilize the rest-frame UV emission lines to probe the chemical abundance in the broad-line region (BLR) of this quasar. We find that this quasar has super solar metallicity through photoionization model calculations.
Citation
Tang, J., Goto, T., Ohyama, Y., Jin, C., Done, C., Lu, T., …Kim, S. J. (2019). Rapid Black Hole Growth at the Dawn of the Universe: Super-Eddington Quasar at z=6.6. Monthly Notices of the Royal Astronomical Society, 484(2), 2575-2586. https://doi.org/10.1093/mnras/stz134
Journal Article Type | Article |
---|---|
Acceptance Date | Jan 8, 2019 |
Online Publication Date | Jan 12, 2019 |
Publication Date | Apr 30, 2019 |
Deposit Date | Jan 9, 2019 |
Publicly Available Date | Jan 9, 2019 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 484 |
Issue | 2 |
Pages | 2575-2586 |
DOI | https://doi.org/10.1093/mnras/stz134 |
Public URL | https://durham-repository.worktribe.com/output/1340083 |
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Copyright Statement
© 2019 The Author(s)
Published by Oxford University Press on behalf of the Royal Astronomical Society
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