Results 161 to 170 of about 111,891 (295)

Cosmic Himalayas: The Highest Quasar Density Peak Identified in a 10,000 deg2 Sky with Spatial Discrepancies between Galaxies, Quasars, and IGM H i

The Astrophysical Journal
We report the identification of a quasar overdensity in the BOSSJ0210 field, dubbed the Cosmic Himalayas, consisting of 11 quasars at z = 2.16−2.20, the densest overdensity of quasars (17 σ ) in the ∼10,000 deg ^2 of the Sloan Digital Sky Survey (SDSS ...
Yongming Liang, Masami Ouchi, Dongsheng Sun, Nobunari Kashikawa, Zheng Cai, Sebastiano Cantalupo, Kentaro Nagamine, Hidenobu Yajima, Takanobu Kirihara, Haibin Zhang, Mingyu Li, Rhythm Shimakawa, Xiaohui Fan, Kei Ito, Masayuki Tanaka, Yuichi Harikane, J. Xavier Prochaska, Andrea Travascio, Weichen Wang, Martin Elvis, Giuseppina Fabbiano, Junya Arita, Masafusa Onoue, John D. Silverman, Dong Dong Shi, Fangxia An, Takuma Izumi, Kazuhiro Shimasaku, Hisakazu Uchiyama, Chenghao Zhu   +29 more
doaj   +1 more source

Simulations of the formation, evolution and clustering of galaxies and quasars

Nature, 2005
V. Springel, S. White, A. Jenkins, C. Frenk, N. Yoshida, Liang Gao, J. Navarro, R. Thacker, D. Croton, J. Helly, J. Peacock, S. Cole, P. Thomas, H. Couchman, A. Evrard, J. Colberg, F. Pearce   +16 more
semanticscholar   +1 more source

Reliable Identification of Binary Supermassive Black Holes from Rubin Observatory Time-domain Monitoring

The Astrophysical Journal
Periodic signatures in time-domain observations of quasars have been used to search for binary supermassive black holes (SMBHs). These searches, across existing time-domain surveys, have produced several hundred candidates.
Megan C. Davis, Kaylee E. Grace, Jonathan R. Trump, Jessie C. Runnoe, Amelia Henkel, Laura Blecha, W. N. Brandt, J. Andrew Casey-Clyde, Maria Charisi, Caitlin A. Witt   +9 more
doaj   +1 more source

The multiple quasar Q2237+0305 under a microlensing caustic [PDF]

, 2008
T. Anguita, R. W. Schmidt, E. L. Turner, J. Wambsganss, R. L. Webster, K. A. Loomis, D. Long, R. McMillan   +7 more
openalex   +1 more source

Exploring the Spectral Energy Distributions of Luminous Broad Absorption Line Quasars at High Redshift

The Astrophysical Journal
We present the multiwavelength spectral energy distributions (SEDs) for 65 luminous broad absorption line (BAL) quasars with redshifts 1.55 ≲  z  ≲ 3.50 from the Gemini Near Infrared Spectrograph–Distant Quasar Survey (GNIRS-DQS).
Harum Ahmed, Sarah C. Gallagher, Ohad Shemmer, Michael S. Brotherton, Cooper Dix, Leigh Parrott, Gordon T. Richards   +6 more
doaj   +1 more source

Tracing the massive inflows feeding super-massive black holes in quasars. [PDF]

Innovation (Camb), 2023
Jiang P, Shi X, Zhou H.
europepmc   +1 more source

Quasar ionization front Lyα emission in an inhomogeneous intergalactic medium [PDF]

, 2016
Frederick B. Davies, Steven R. Furlanetto, Matthew McQuinn   +2 more
openalex   +1 more source

VaDAR: Varstrometry for Dual AGN Using Radio Interferometry

The Astrophysical Journal
Binary and dual active galactic nuclei (AGNs) are an important observational tool for studying the formation and dynamical evolution of galaxies and supermassive black holes.
Emma Schwartzman, Tracy E. Clarke, Kristina Nyland, Nathan J. Secrest, Ryan W. Pfeifle, Henrique Schmitt, Shobita Satyapal, Barry Rothberg   +7 more
doaj   +1 more source

Optimal distribution of VLBI transmitters in the Galileo space segment for frame ties. [PDF]

Earth Planets Space, 2023
Wolf H, Böhm J.
europepmc   +1 more source

ESTIMATING PHOTOMETRIC REDSHIFTS OF QUASARS VIA THEk-NEAREST NEIGHBOR APPROACH BASED ON LARGE SURVEY DATABASES [PDF]

, 2013
Yanxia Zhang, He Ma, Nanbo Peng, Yongheng Zhao, Xue-bing Wu   +4 more
openalex   +1 more source