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A first look at quasar-galaxy clustering at
Jan-Torge Schindler, Joseph F. Hennawi, Frederick B. Davies +8
We present JWST observations of the environments surrounding two high-redshift quasars, J02520503 at and J10072115 at , which enable the first constraints…
A Little Red Dot at within a Large Galaxy Overdensity
Jan-Torge Schindler, Joseph F. Hennawi, Frederick B. Davies +11
The nature of "Little Red Dots" and their relation to other forms of accreting supermassive black holes remain an open question. Here we report the discovery of a Little Red Dot at…
[OIII] emission in z=2 quasars with and without Broad Absorption Lines
Matthew J. Temple, Amy L. Rankine, Manda Banerji +6
Understanding the links between different phases of outflows from active galactic nuclei is a key goal in extragalactic astrophysics. Here we compare [OIII] 4960,5008 outflow s…
Optical and near-infrared spectroscopy of quasars at : public data release and composite spectrum
Silvia Onorato, Joseph F. Hennawi, Jan-Torge Schindler +18
We present optical and near-infrared (NIR) spectroscopic observations for a sample of quasars at with absolute magnitudes at Å in the range $-28.82…
The Pan-STARRS1 z>5.6 quasar survey II: Discovery of 55 Quasars at 5.6<z<6.5
Eduardo Banados, Jan-Torge Schindler, Bram P. Venemans +20
The identification of bright quasars at z>6 enables detailed studies of supermassive black holes, massive galaxies, structure formation, and the state of the intergalactic medium w…
The Pan-STARRS1 Quasar Survey: III. The Quasar Luminosity Function
Jan-Torge Schindler, Eduardo Bañados, Thomas Connor +9
We present the type-1 quasar luminosity function (QLF) based on the Pan-STARRS1 (PS1) quasar survey. The PS1 sample includes 125 quasars at with $…
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…
Discovery of 24 radio-bright quasars at using low-frequency radio observations
A. J. Gloudemans, K. J. Duncan, A. Saxena +18
High redshift quasars () that also shine brightly at radio wavelengths are unique signposts of supermassive black hole activity in the early universe. However, bright radio so…
Deep XMM-Newton Observations of an X-ray Weak, Broad Absorption Line Quasar at
Jinyi Yang, Xiaohui Fan, Feige Wang +14
We report X-ray observations of the most distant known gravitationally lensed quasar, J0439+1634 at , which is also a broad absorption line (BAL) quasar, using the XMM-Newt…
Paving the Way for Euclid and JWST via Optimal Selection of High-z Quasars
Riccardo Nanni, Joseph F. Hennawi, Feige Wang +3
We introduce a probabilistic approach to select 6<z<8 quasar candidates for spectroscopic follow-up, which is based on density estimation in the high-dimensional space inhabited by…
Probing Early Super-massive Black Hole Growth and Quasar Evolution with Near-infrared Spectroscopy of 37 Reionization-era Quasars at 6.3 < z <= 7.64
Jinyi Yang, Feige Wang, Xiaohui Fan +18
We report the results of near-infrared spectroscopic observations of 37 quasars in the redshift range , including 32 quasars at , forming the largest quasar n…
Redshift identification of X-ray selected active galactic nuclei in the J1030 field: searching for large-scale structures and high-redshift sources
Stefano Marchesi, Marco Mignoli, Roberto Gilli +23
We publicly release the spectroscopic and photometric redshift catalog of the sources detected with Chandra in the field of the =6.3 quasar SDSS J1030+0525. This is currently th…
Chandra and Magellan/FIRE follow-up observations of PSO167-13: an X-ray weak QSO at
Fabio Vito, William Nielsen Brandt, Federica Ricci +19
The discovery of hundreds of QSOs in the first Gyr of the Universe powered by already grown SMBHs challenges our knowledge of SMBH formation. In particular, investigations of …
A Luminous Quasar at Redshift 7.642
Feige Wang, Jinyi Yang, Xiaohui Fan +20
Distant quasars are unique tracers to study the formation of the earliest supermassive black holes (SMBHs) and the history of cosmic reionization. Despite extensive efforts, only t…
Revealing the Accretion Physics of Supermassive Black Holes at Redshift z~7 with Chandra and Infrared Observations
Feige Wang, Xiaohui Fan, Jinyi Yang +14
X-ray emission from quasars has been detected up to redshift , although only limited to a few objects at . In this work, we present new Chandra observations of five $…
X-ray redshifts for obscured AGN: a case study in the J1030 deep field
Alessandro Peca, Cristian Vignali, Roberto Gilli +9
We present a procedure to constrain the redshifts of obscured ( cm) Active Galactic Nuclei (AGN) based on low-count statistics X-ray spectra, which can be ado…
Discovery of molecular gas fueling galaxy growth in a protocluster at z=1.7
Q. D'Amato, R. Gilli, I. Prandoni +16
Based on ALMA Band 3 observations of the CO(2-1) line transition, we report the discovery of three new gas-rich (M_H2 ~ 1.5-4.8 x 10^10 M_sun, SFRs in the range ~5-100 M_sun/yr) ga…
The deep Chandra survey in the SDSS J1030+0524 field
R. Nanni, R. Gilli, C. Vignali +18
We present the X-ray source catalog for the 479 ks Chandra exposure of the SDSS J1030+0524 field, that is centered on a region that shows the best evidence to date of an overdensit…
Testing the paradigm: First spectroscopic evidence of a quasar-galaxy Mpc-scale association at cosmic dawn
Roberto Decarli, Marco Mignoli, Roberto Gilli +9
State-of-the-art models of massive black hole formation postulate that quasars at reside in extreme peaks of the cosmic density structure in the early universe. Even so, dire…
Discovery of a galaxy overdensity around a powerful, heavily obscured FRII radio galaxy at z=1.7: star formation promoted by large-scale AGN feedback?
R. Gilli, M. Mignoli, A. Peca +25
We report the discovery of a galaxy overdensity around a Compton-thick Fanaroff-Riley type II (FRII) radio galaxy at z=1.7 in the deep multiband survey around the z=6.3 QSO SDSS J1…
The X-ray properties of quasars: no evident evolution of accretion physics in the first Gyr of the Universe
Fabio Vito, William Nielsen Brandt, Franz Erik Bauer +10
X-ray emission from QSOs has been used to assess SMBH accretion properties up to ~6. However, at only ~15 QSOs are covered by sensitive X-ray observations, preventing a st…
Discovery of the first heavily obscured QSO candidate at in a close galaxy pair
Fabio Vito, William Nielsen Brandt, Franz Erik Bauer +14
While theoretical arguments predict that most of the early growth of supermassive black holes (SMBHs) happened during heavily obscured phases of accretion, current methods used for…
The 500 ks Chandra observation of the z = 6.31 QSO SDSS J1030+0524
R. Nanni, R. Gilli, C. Vignali +23
We present the results from a ks Chandra observation of the QSO SDSS J1030+0524. This is the deepest X-ray observation to date of a QSO. The QSO is dete…
The X-ray properties of z6 luminous quasars
R. Nanni, C. Vignali, R. Gilli +2
We present a systematic analysis of X-ray archival data of all the 29 quasars (QSOs) at > 5.5 observed so far with Chandra, XMM-Newton and Swift-XRT, including the most-distant…