224 citations · 1.4k across the 18 of their papers we have counts for
18 papers
Continuum Reverberation in Bright Quasars Using NASA/ATLAS
Zachary Steyn, Christian Wolf, Christopher Onken +5
Variable continuum emission from AGN can be used to probe the structure of their accretion disks via reverberation mapping. Assuming a variable, hot inner light source irradiates t…
The Variability Structure Function of the Highest-Luminosity Quasars on Short Timescales
Ji-Jia Tang, Christian Wolf, John Tonry
The stochastic photometric variability of quasars is known to follow a random-walk phenomenology on emission timescales of months to years. Some high-cadence restframe optical moni…
Probing Quasar Viewing Angle with the Variability Structure Function
Ji-Jia Tang, Christian Wolf, John Tonry +3
Given the anisotropic emission from quasar accretion discs, their viewing angle affects estimates of the quasar luminosity, black-hole mass and Eddington ratio. Discs appear overlu…
Universality in the Random Walk Structure Function of Luminous Quasi-Stellar Objects
Ji-Jia Tang, Christian Wolf, John Tonry
Rapidly growing black holes are surrounded by accretion disks that make them the brightest objects in the Universe. Their brightness is known to be variable, but the causes of this…
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) XII. Extended [C II] Structure (Merger or Outflow) in a z = 6.72 Red Quasar
Takuma Izumi, Masafusa Onoue, Yoshiki Matsuoka +31
We present ALMA [C II] 158 m line and far-infrared (FIR) continuum emission observations toward HSC J120505.09000027.9 (J12050000) at with the beam size of $\si…
Subaru medium-resolution spectra of a QSO at z=6.62: Three reionization tests
Ting-Yi Lu, Tomotsugu Goto, Ji-Jia Tang +9
Investigating the Gunn-Peterson trough of high redshift quasars (QSOs) is a powerful way to reveal the cosmic reionization. As one of such attempts, we perform a series of analyses…
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). X. Discovery of 35 Quasars and Luminous Galaxies at 5.7 z 7.0
Yoshiki Matsuoka, Kazushi Iwasawa, Masafusa Onoue +44
We report the discovery of 28 quasars and 7 luminous galaxies at 5.7 z 7.0. This is the tenth in a series of papers from the Subaru High-z Exploration of Low-Luminosity…
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) VIII. A less biased view of the early co-evolution of black holes and host galaxies
Takuma Izumi, Masafusa Onoue, Yoshiki Matsuoka +24
We present ALMA [CII] line and far-infrared (FIR) continuum observations of three low-luminosity quasars () discovered by our Subaru Hyper Suprime-Cam (…
Discovery of the First Low-Luminosity Quasar at z > 7
Yoshiki Matsuoka, Masafusa Onoue, Nobunari Kashikawa +45
We report the discovery of a quasar at z = 7.07, which was selected from the deep multi-band imaging data collected by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey.…
Rapid Black Hole Growth at the Dawn of the Universe: A Super-Eddington Quasar at z=6.6
Ji-Jia Tang, Tomotsugu Goto, Youichi Ohyama +7
We present the analysis of a new near-infrared (NIR) spectrum of a recently discovered quasar PSO J006+39 in an attempt to explore the early growth of supermassive black…
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). V. Quasar Luminosity Function and Contribution to Cosmic Reionization at z = 6
Yoshiki Matsuoka, Michael A. Strauss, Nobunari Kashikawa +44
We present new measurements of the quasar luminosity function (LF) at , over an unprecedentedly wide range of the rest-frame ultraviolet luminosity from …
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 < z < 6.9
Y. Matsuoka, K. Iwasawa, M. Onoue +44
We report discovery of 41 new high-z quasars and luminous galaxies, which were spectroscopically identified at 5.7 < z < 6.9. This is the fourth in a series of papers from the Suba…
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) III. Star formation properties of the host galaxies at studied with ALMA
Takuma Izumi, Masafusa Onoue, Hikari Shirakata +26
We present our ALMA Cycle 4 measurements of the [CII] emission line and the underlying far-infrared (FIR) continuum emission from four optically low-luminosity ($M_{\rm 1450} > -25…
Infrared Selection of Obscured Active Galactic Nuclei in the COSMOS Field
Yu-Yen Chang, Emeric Le Floc'h, Stéphanie Juneau +13
We present a study of the connection between black hole accretion, star formation, and galaxy morphology at z<=2.5. We focus on active galactic nuclei (AGNs) selected by their mid-…
Minor Contribution of Quasars to Ionizing Photon Budget at z~6: Update on Quasar Luminosity Function at the Faint-end with Subaru/Suprime-Cam
Masafusa Onoue, Nobunari Kashikawa, Chris J. Willott +16
We constrain the quasar contribution to cosmic reionization based on our deep optical survey of z~6 quasars down to z_R=24.15 using Subaru/Suprime-Cam in three UKIDSS-DXS fields co…
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). II. Discovery of 32 Quasars and Luminous Galaxies at 5.7 < z < 6.8
Yoshiki Matsuoka, Masafusa Onoue, Nobunari Kashikawa +43
We present spectroscopic identification of 32 new quasars and luminous galaxies discovered at 5.7 < z < 6.8. This is the second in a series of papers presenting the results of the…
A Quasar Discovered at redshift 6.6 from Pan-STARRS1
Ji-Jia Tang, Tomotsugu Goto, Youichi Ohyama +11
Luminous high-redshift quasars can be used to probe of the intergalactic medium (IGM) in the early universe because their UV light is absorbed by the neutral hydrogen along the lin…
Subaru high-z exploration of low-luminosity quasars (SHELLQs). I. Discovery of 15 quasars and bright galaxies at 5.7 < z < 6.9
Yoshiki Matsuoka, Masafusa Onoue, Nobunari Kashikawa +36
We report the discovery of 15 quasars and bright galaxies at 5.7 < z < 6.9. This is the initial result from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) projec…