Results 61 to 70 of about 1,473 (119)
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
The Astrophysical JournalWe 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 +6 more
doaj +1 more source
VaDAR: Varstrometry for Dual AGN Using Radio Interferometry
The Astrophysical JournalBinary 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 +7 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
A Surprising Excess of Radio Emission in Extremely Stable Quasars: A Unique Clue to Jet Launching?
The Astrophysical JournalQuasars are generally divided into jetted radio-loud and nonjetted radio-quiet ones, but why only 10% of quasars are radio-loud has been puzzling for decades.
Wen-Yong Kang +8 more
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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
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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
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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
The Astrophysical Journal Supplement SeriesWe present a systematic search for changing-look (CL) quasars at high redshift z > 0.9 by crossmatching the spectroscopic data sets from the Dark Energy Spectroscopic Instrument Data Release 1 and Sloan Digital Sky Survey Data Release 18. We identify 97
Zhi-Qiang Chen +12 more
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