DOUBLE QUASARS: PROBES OF BLACK HOLE SCALING RELATIONSHIPS AND MERGER SCENARIOS [PDF]
The Astrophysical Journal, 2009 ApJ in ...
Foreman, G, Volonteri, M, DOTTI, MASSIMO
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Double-Lobed Radio Quasars from the Sloan Digital Sky Survey [PDF]
The Astronomical Journal, 2006 We have combined a sample of 44984 quasars, selected from the Sloan Digital Sky Survey (SDSS) Data Release 3, with the FIRST radio survey. Using a novel technique where the optical quasar position is matched to the complete radio environment within 450", we are able to characterize the radio morphological make-up of what is essentially an optically ...
de Vries, W. H. +2 more
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Relativistic Beaming and the Nuclei of Double-lobed Radio Quasars [PDF]
Symposium - International Astronomical Union, 1988 We have defined a complete sample of double-lobed 3CR quasars with minimal orientation bias. Properties of these objects on the >kpc scale are consistent with the simple beaming model for their nuclei. VLBI maps of six nuclei reveal “core-jet” structures.
D. H. Hough, A. C. S. Readhead
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UniverseHigh-redshift active galactic nuclei (AGN) provide key insights into early supermassive black hole growth and cosmic evolution. This study investigates the parsec-scale properties of 86 radio-loud quasars at z ≥ 3 using very long baseline interferometry (
Shaoguang Guo +7 more
doaj +2 more sources
A hidden population of high-redshift double quasars unveiled by astrometry [PDF]
Nature Astronomy, 2021 Galaxy mergers occur frequently in the early Universe1 and bring multiple supermassive black holes (SMBHs) into the nucleus, where they may eventually coalesce.
Yue Shen +8 more
semanticscholar +1 more source
Varstrometry for Off-nucleus and Dual Subkiloparsec AGN (VODKA): Hubble Space Telescope Discovers Double Quasars [PDF]
Astrophysical Journal, 2021 Dual supermassive black holes (SMBHs) at ∼kiloparsec scales are the progenitor population of SMBH mergers and play an important role in understanding the pairing and dynamical evolution of massive black holes in galaxy mergers.
Yu-Ching Chen +6 more
semanticscholar +1 more source
A tale of two double quasars: Hubble constant tension or biases? [PDF]
The Sixteenth Marcel Grossmann Meeting, 2022 GLENDAMA Project Core Team, Universidad de Cantabria, Avda. de Los Castros 48, E-39005 Santander, Spain gravlens.unican.es ∗E-mail: goicol@unican.es ∗∗Main addresses: O.Ya.
L. Goicoechea, V. Shalyapin
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Quasars with Proper Motions and the Link to Double and Multiple AGNs [PDF]
, 2022 Gaia used a large sample of photometrically selected active galactic nuclei (AGNs) and quasars to remove the residual spin of its global proper motion system in order to achieve a maximally inertial reference frame.
V. Makarov, N. Secrest
semanticscholar +1 more source
The diverse cold molecular gas contents, morphologies, and kinematics of type-2 quasars as seen by ALMA [PDF]
Astronomy & Astrophysics, 2021 We present CO(2−1) and adjacent continuum observations of seven nearby radio-quiet type-2 quasars (QSO2s) obtained with ALMA at ∼0.2′′ resolution (370 pc at z∼0.1). These QSO2s are luminous (L[OIII] >108.5L ∼MB
C. R. Almeida +10 more
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Discovery of five green pea galaxies with double-peaked narrow [O iii] lines [PDF]
Monthly notices of the Royal Astronomical Society, 2023 Although double-peaked narrow emission-line galaxies have been studied extensively in the past years, only a few are reported with the Green pea galaxies (GPs). Here we present our discovery of five GPs with double-peaked narrow [O iii] emission lines,
Ruqiu Lin +11 more
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