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Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 < z < 7.0
Astrophysics of Galaxies · Submitted 24 Nov 2021
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim This demonstrates that the algorithm has very high efficiency, even though we are probing an unprecedentedly low-luminosity population down to M1450 ~ -21 mag.
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The abstract, sentence by sentence
We present the spectroscopic discovery of 69 quasars at 5.8 < z < 7.0, drawn from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) imaging survey data. This is the 16th publication from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, and completes identification of all but the faintest candidates (i.e., i-band dropouts with zAB < 24 and y-band detections, and z-band dropouts with yAB < 24) with Bayesian quasar probability Pq > 0.1 in the HSC-SSP third public data release (PDR3). The sample reported here also includes three quasars with Pq < 0.1 at z ~ 6.6, which we selected in an effort to completely cover the reddest point sources with simple color cuts. The number of high-z quasars discovered in SHELLQs has now grown to 162, including 23 type-II quasar candidates. This paper also presents identification of seven galaxies at 5.6 < z < 6.7, an [O III] emitter at z = 0.954, and 31 Galactic cool stars and brown dwarfs. High-z quasars and galaxies comprise 75 % and 16 % respectively of all the spectroscopic SHELLQs objects that pass our latest selection algorithm with the PDR3 photometry. That is, a total of 91 % of the objects lie at z > 5.6. This demonstrates that the algorithm has very high efficiency, even though we are probing an unprecedentedly low-luminosity population down to M1450 ~ -21 mag.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present the spectroscopic discovery of 69 quasars at 5.8 < z < 7.0, drawn from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) imaging survey data. | contribution 0.63 | 0.97 | 0.57 | asserted 1.00 |
| s1 | This is the 16th publication from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, and completes identification of all but the faintest candidates (i.e., i-band dropouts with zAB < 24 and y-band detections, and z-band dropouts with yAB < 24) with Bayesian quasar probability Pq > 0.1 in the HSC-SSP third public data release (PDR3). | contribution 0.52 | 0.84 | 0.16 | asserted 1.00 |
| s2 | The sample reported here also includes three quasars with Pq < 0.1 at z ~ 6.6, which we selected in an effort to completely cover the reddest point sources with simple color cuts. | method 0.36 | 0.96 | 0.04 | asserted 1.00 |
| s3 | The number of high-z quasars discovered in SHELLQs has now grown to 162, including 23 type-II quasar candidates. | result 0.88 | 0.91 | 0.13 | asserted 1.00 |
| s4 | This paper also presents identification of seven galaxies at 5.6 < z < 6.7, an [O III] emitter at z = 0.954, and 31 Galactic cool stars and brown dwarfs. | result 0.92 | 0.96 | 0.06 | asserted 1.00 |
| s5 | High-z quasars and galaxies comprise 75 % and 16 % respectively of all the spectroscopic SHELLQs objects that pass our latest selection algorithm with the PDR3 photometry. | result 0.99 | 0.94 | 0.13 | asserted 1.00 |
| s6 | That is, a total of 91 % of the objects lie at z > 5.6. | result 0.90 | 0.87 | 0.12 | asserted 1.00 |
| s7 | This demonstrates that the algorithm has very high efficiency, even though we are probing an unprecedentedly low-luminosity population down to M1450 ~ -21 mag. | interpretation 1.00 | 0.88 | 0.40 | asserted 1.00 |
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The paper
Original abstract
We present the spectroscopic discovery of 69 quasars at 5.8 < z < 7.0, drawn from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) imaging survey data. This is the 16th publication from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, and completes identification of all but the faintest candidates (i.e., i-band dropouts with zAB < 24 and y-band detections, and z-band dropouts with yAB < 24) with Bayesian quasar probability Pq > 0.1 in the HSC-SSP third public data release (PDR3). The sample reported here also includes three quasars with Pq < 0.1 at z ~ 6.6, which we selected in an effort to completely cover the reddest point sources with simple color cuts. The number of high-z quasars discovered in SHELLQs has now grown to 162, including 23 type-II quasar candidates. This paper also presents identification of seven galaxies at 5.6 < z < 6.7, an [O III] emitter at z = 0.954, and 31 Galactic cool stars and brown dwarfs. High-z quasars and galaxies comprise 75 % and 16 % respectively of all the spectroscopic SHELLQs objects that pass our latest selection algorithm with the PDR3 photometry. That is, a total of 91 % of the objects lie at z > 5.6. This demonstrates that the algorithm has very high efficiency, even though we are probing an unprecedentedly low-luminosity population down to M1450 ~ -21 mag.
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References
How the literature uses it
4 arXiv papers cite this in 8 sentences
Papers citing it · 2 sentences without a confident label
Uses its method or tool 1 paper
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Finally, we adopt the criterion in the $z$-band magnitude error $σ_z<0.155$, which is used to select the real quasars, to the random positions criteria [ref] .
Supermassive primordial black holes: a view from clustering of quasars at $z \sim 6$ · Sample of $z∼6$ quasars · 0.88
Uses its data or values 2 papers
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In order to evaluate the ACF of the quasars at $z∼6$ with the projected two-point angular correlation function, we use the quasar sample constructed by Matsuoka et al. (SHELLQs) [ref] .
Supermassive primordial black holes: a view from clustering of quasars at $z \sim 6$ · Sample of $z∼6$ quasars · 0.99
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We adopt the $z≃6$ quasar sample selected from the SHELLQs survey [ref] and supplement it with known quasars from the literature [ref] that lie within the same survey footprint from the HSC-SSP PDR3 Wide-layer dataset with a sky coverage of $∼1200 deg^2$ [ref] .
Constraining supermassive primordial black hole clustering with the angular auto-correlation of $z\simeq 6$ quasars · Quasar sample · 1.00
Cites it as background 1 paper
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Wide-field optical and near-infrared surveys, including the Sloan Digital Sky Survey (SDSS) [ref] , Subaru High-$z$ Exploration of Low-Luminosity Quasars (SHELLQs) [ref] , the Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) [ref] , the Panoramic Survey Telescope and Rapid Response System 1 (PanSTARRS1) [ref] , and the United Kingdom Infrared Telescope Infrared Deep Sky Survey (UKIDSS) [ref] , have discovered a large population of luminous quasars at $z≳6$ [ref] .
Constraining supermassive primordial black hole clustering with the angular auto-correlation of $z\simeq 6$ quasars · Introduction · 0.81
What it cites · 1 sentence without a confident label
Uses data or values from 1 paper
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All the $z$-dropout candidates have been observed; while the formal magnitude cut is $y_AB = 25.0$ (Step 1), the actual limiting magnitude depends mostly on the depth achieved in the HSC imaging, which is $y_AB ∼24.4$ for 5$σ$ detection of point sources in the Wide layer [ref] .
Third Data Release of the Hyper Suprime-Cam Subaru Strategic Program · Candidate selection and spectroscopy · 0.98
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