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High- Quasar Candidate Archive: A Spectroscopic Catalog of Quasars and Contaminants in Various Quasar Searches
Da-Ming Yang, Jan-Torge Schindler, Riccardo Nanni +7
We present the high- quasar candidate archive (HzQCA), summarizing the spectroscopic observations of 174 quasar candidates using Keck/LRIS, Keck/MOSFIRE, and Keck/NI…
(Nearly) Model-Independent Constraints on the Neutral Hydrogen Fraction in the Intergalactic Medium at Using Dark Pixel Fractions in Ly and Ly Forests
Xiangyu Jin, Jinyi Yang, Xiaohui Fan +10
Cosmic reionization was the last major phase transition of hydrogen from neutral to highly ionized in the intergalactic medium (IGM). Current observations show that the IGM is sign…
The XQR-30 Metal Absorber Catalog: 778 Absorption Systems Spanning 2 < z < 6.5
Rebecca L. Davies, Emma Ryan-Weber, Valentina D'Odorico +11
Intervening metal absorption lines in the spectra of z > 6 quasars are fundamental probes of the ionization state and chemical composition of circumgalactic and intergalactic gas n…
Detection of stellar light from quasar host galaxies at redshifts above 6
Xuheng Ding, Masafusa Onoue, John D. Silverman +41
The detection of starlight from the host galaxies of quasars during the reionization epoch () has been elusive, even with deep HST observations. The current highest redshift q…
Demographics of z ~ 6 Quasars in the Black Hole Mass-Luminosity Plane
Jin Wu, Yue Shen, Linhua Jiang +8
We study the demographics of z ~ 6 broad-line quasars in the black hole (BH) mass-luminosity plane using a sample of more than 100 quasars at 5.7 < z < 6.5. These quasars have well…
Target Selection and Validation of DESI Quasars
Edmond Chaussidon, Christophe Yèche, Nathalie Palanque-Delabrouille +54
The Dark Energy Spectroscopic Instrument (DESI) survey will measure large-scale structures using quasars as direct tracers of dark matter in the redshift range 0.9<z<2.1 and using…