Results 1 to 10 of about 515 (214)
Double-Lobed Radio Quasars from the Sloan Digital Sky Survey [PDF]
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
exaly +6 more sources
A Catalog of Candidate Double and Lensed Quasars from Gaia and WISE Data
The Astrophysical Journal Supplement Series, 2022 Making use of strong correlations between closely separated multiple or double sources and photometric and astrometric metadata in Gaia Early Data Release 3 (EDR3), we generate a catalog of candidate double- and multiply imaged lensed quasars and active ...
Valeri V. Makarov, Nathan J. Secrest
doaj +3 more sources
DOUBLE QUASARS: PROBES OF BLACK HOLE SCALING RELATIONSHIPS AND MERGER SCENARIOS [PDF]
Astrophysical Journal, 2009 ApJ in ...
Foreman, G, Volonteri, M, DOTTI, MASSIMO
exaly +3 more sources
Quasars with Proper Motions and the Link to Double and Multiple AGNs
Astrophysical Journal, 2022 Abstract 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. A small fraction of these reference objects have statistically significant astrometric proper motions in Gaia EDR3.
Nathan Secrest, Valeri Makarov
exaly +3 more sources
A hidden population of high-redshift double quasars unveiled by astrometry [PDF]
Nature Astronomy, 2021 Galaxy mergers occur frequently in the early universe and bring multiple supermassive black holes (SMBHs) into the nucleus, where they may eventually coalesce. Identifying post-merger-scale (i.e., 2, but critical to constraining the progenitors of SMBH mergers.
Nadia Zakamska +2 more
exaly +3 more sources
A Candidate Dual QSO at Cosmic Noon
The Astrophysical Journal Letters, 2023 We report the discovery of a candidate dual QSO at z = 1.889, a redshift that is in the era known as “cosmic noon” where most of the universe’s black hole and stellar mass growth occurred.
Eilat Glikman +8 more
doaj +1 more source
Statistics of Galactic-scale Quasar Pairs at Cosmic Noon
The Astrophysical Journal, 2023 The statistics of galactic-scale quasar pairs can elucidate our understanding of the dynamical evolution of supermassive black hole (SMBH) pairs, the duty cycles of quasar activity in mergers, or even the nature of dark matter, but they have been ...
Yue Shen +10 more
doaj +1 more source
4C02.27: what is inside a double-double radio quasar? [PDF]
Proceedings of 10th European VLBI Network Symposium and EVN Users Meeting: VLBI and the new generation of radio arrays — PoS(10th EVN Symposium), 2011 4 pages, 2 figures, to appear in the proceedings of the 10th European VLBI Network Symposium (September 20-24, 2010, Manchester, UK).
Frey, S., Paragi, Z.
openaire +2 more sources
The Astronomical Journal, 2023 We present the first results from a new survey for high-redshift ( z ≳ 5) gravitationally lensed quasars and close quasar pairs. We carry out candidate selection based on the colors and shapes of objects in public imaging surveys, then conduct follow-up ...
Minghao Yue +3 more
doaj +1 more source
Microlensing in the double quasar SBS 1520+530 [PDF]
Astronomy & Astrophysics, 2005 6 pages, 7 figures.
Gaynullina, E. R. +9 more
openaire +2 more sources