Gemini GNIRS near-infrared spectroscopy of 50 quasars at z>~5.7
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Gemini GNIRS near-infrared spectroscopy of 50 quasars at z>~5.7. / Shen, Yue; Wu, Jin; Jiang, Linhua; Banados, 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.
In: Astrophysical Journal, Vol. 873, 35, 01.03.2019.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Gemini GNIRS near-infrared spectroscopy of 50 quasars at z>~5.7
AU - Shen, Yue
AU - Wu, Jin
AU - Jiang, Linhua
AU - Banados, Eduardo
AU - Fan, Xiaohui
AU - Ho, Luis C.
AU - Riechers, Dominik A.
AU - Strauss, Michael A.
AU - Venemans, Bram
AU - Vestergaard, Marianne
AU - Walter, Fabian
AU - Wang, Feige
AU - Willott, Chris
AU - Wu, Xue-Bing
AU - Yang, Jinyi
PY - 2019/3/1
Y1 - 2019/3/1
N2 - We report initial results from a large Gemini program to observez>~5.7 quasars with GNIRS near-IR spectroscopy. Our sample includes50 quasars with simultaneous ~0.85-2.5 micron spectra covering therest-frame ultraviolet and major broad emission lines from Ly-alpha toMgII. We present spectral measurements for these quasars and compare totheir lower-redshift counterparts at z=1.5-2.3. We find that when quasarluminosity is matched, there are no significant differences between therest-UV spectra of z>~5.7 quasars and the low-z comparison sample.High-z quasars have similar continuum and emission line properties andoccupy the same region in the black hole mass and luminosity space asthe comparison sample, accreting at an average Eddington ratio of ~0.3.There is no evidence for super-Eddington accretion or hypermassive(>10^10 Msun) black holes within our sample. We find a mild excess ofquasars with weak CIV lines relative to the control sample. Our results,corroborating earlier studies but with better statistics, demonstratethat these high-z quasars are already mature systems of accretingsupermassive black holes operating with the same physical mechanisms asthose at lower redshifts.
AB - We report initial results from a large Gemini program to observez>~5.7 quasars with GNIRS near-IR spectroscopy. Our sample includes50 quasars with simultaneous ~0.85-2.5 micron spectra covering therest-frame ultraviolet and major broad emission lines from Ly-alpha toMgII. We present spectral measurements for these quasars and compare totheir lower-redshift counterparts at z=1.5-2.3. We find that when quasarluminosity is matched, there are no significant differences between therest-UV spectra of z>~5.7 quasars and the low-z comparison sample.High-z quasars have similar continuum and emission line properties andoccupy the same region in the black hole mass and luminosity space asthe comparison sample, accreting at an average Eddington ratio of ~0.3.There is no evidence for super-Eddington accretion or hypermassive(>10^10 Msun) black holes within our sample. We find a mild excess ofquasars with weak CIV lines relative to the control sample. Our results,corroborating earlier studies but with better statistics, demonstratethat these high-z quasars are already mature systems of accretingsupermassive black holes operating with the same physical mechanisms asthose at lower redshifts.
KW - Astrophysics - Astrophysics of Galaxies
KW - Astrophysics - Cosmology and Nongalactic Astrophysics
U2 - 10.3847/1538-4357/ab03d9
DO - 10.3847/1538-4357/ab03d9
M3 - Journal article
VL - 873
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
M1 - 35
ER -
ID: 204430033