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Gemini GNIRS Near-infrared Spectroscopy of 50 Quasars at z >= 5.7

Author(s): Shen, Yue; Wu, Jin; Jiang, Linhua; Ba nados, Eduardo; Fan, Xiaohui; et al

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Abstract: We report initial results from a large Gemini program to observe z5.7 quasars with GNIRS near-IR spectroscopy. Our sample includes 50 quasars with simultaneous ∼0.85–2.5 μm spectra covering the rest-frame ultraviolet and major broad emission lines from Lyαto Mg II. We present spectral measurements for these quasars and compare with their lower redshift counterparts at z=1.5–2.3. We find that when quasar luminosity is matched, there are no significant differences between the rest-UV spectra of z5.7 quasars and the low-z comparison sample. High-z quasars have similar continuum and emission line properties and occupy the same region in the black hole mass and luminosity space as the comparison sample, accreting at an average Eddington ratio of ∼0.3. There is no evidence for super-Eddington accretion or hypermassive (>1010 Me)black holes within our sample. We find a mild excess of quasars with weak C IV lines relative to the control sample. Our results, corroborating earlier studies but with better statistics, demonstrate that these high-z quasars are already mature systems of accreting supermassive black holes operating with the same physical mechanisms as those at lower redshifts.
Publication Date: 1-Mar-2019
Electronic Publication Date: 1-Mar-2019
Citation: Shen, Yue, Wu, Jin, Jiang, Linhua, Ba nados, Eduardo, Fan, Xiaohui, Ho, Luis C, Riechers, Dominik A, Strauss, Michael A, Venemans, Bram, Vestergaard, Marianne, Walter, Fabian, Wang, Feige, Willott, Chris, Wu, Xue-Bing, Yang, Jinyi. (2019). Gemini GNIRS Near-infrared Spectroscopy of 50 Quasars at z \ensuremath\gtrsim 5.7. \apj, 873 (35 - 35. doi:10.3847/1538-4357/ab03d9
DOI: doi:10.3847/1538-4357/ab03d9
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Type of Material: Journal Article
Journal/Proceeding Title: Astrophysical Journal
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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