Results 111 to 120 of about 20,438 (217)
UEG Week 2025 Poster Presentations
United European Gastroenterology Journal, Volume 13, Issue S8, Page S803-S1476, October 2025.
wiley +1 more source
The Astrophysical JournalPeriodic 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 +9 more
doaj +1 more source
The Astrophysical JournalWe report the distribution of black hole (BH) masses and Eddingont ratios estimated for a sample of 131 low luminosity quasars in the early cosmic epoch (5.6 < z < 7.0).
Ayumi Takahashi +11 more
doaj +1 more source
EIGER. V. Characterizing the Host Galaxies of Luminous Quasars at z ≳ 6
The Astrophysical JournalWe report JWST/NIRCam measurements of quasar host galaxy emissions and supermassive black hole (SMBH) masses for six quasars at 5.9 < z < 7.1 in the Emission-line galaxies and Intergalactic Gas in the Epoch of Reionization (EIGER) project. We obtain deep
Minghao Yue +8 more
doaj +1 more source
Environments around Quasars at z ∼ 3 Revealed by Wide-field Imaging with Subaru HSC and CFHT
The Astrophysical JournalWe examine the local density environments around 67 quasars at z ∼ 3 by combining the imaging data of Hyper Suprime-Cam Subaru Strategic Program and Canada–France–Hawaii Telescope Large Area U -band Deep Survey over about 20 deg ^2 .
Yuta Suzuki +9 more
doaj +1 more source
Quasar Lifetime Measurements from Extended Lyα Nebulae at z ∼ 6
The Astrophysical JournalThe existence of billion-solar-mass black holes hosted in luminous quasars within the first gigayear of cosmic history poses a challenge to our understanding of supermassive black hole (SMBH) growth.
Dominika Ďurovčíková +9 more
doaj +1 more source