Results 171 to 180 of about 1,391,040 (211)

Machine learning based stellar classification with highly sparse photometry data. [PDF]

Open Res Eur
Cody SE, Scher S, McDonald I, Zijlstra A, Alexander E, Cox N.   +5 more
europepmc   +1 more source

Automation of finding strong gravitational lenses in the Kilo Degree Survey with U - DenseLens (DenseLens  + Segmentation). [PDF]

Mon Not R Astron Soc
N BC, Koopmans LVE, Valentijn EA, Kleijn GV, de Jong JTA, Napolitano N, Li R, Tortora C, Busillo V, Dong Y.   +9 more
europepmc   +1 more source

Further <i>N</i>-Frame networking dynamics of conscious observer-self agents via a functional contextual interface: predictive coding, double-slit quantum mechanical experiment, and decision-making fallacy modeling as applied to the measurement problem in humans and AI. [PDF]

Front Comput Neurosci
Edwards DJ.
europepmc   +1 more source

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   +4 more sources

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., Becker, R. H., White, R. L.   +2 more
exaly   +5 more sources

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Quasars: Double Darkness in Draco

Science, 1993
Ray Jayawardhana, R Jayawardhana
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, Jennifer I-Hsiu Li, Yu-Ching Chen   +2 more
exaly   +3 more sources

VLA Observations of the Double Quasar 0957+561: Gravitational Double Image or Binary Quasar?

Symposium - International Astronomical Union, 1980
The radio source 0957+561 was identified by Walsh et al. (1979, Nature 279, pp.381–384) with a pair of quasars, 6.1 apart on the sky, whose optical emission and absorption spectra are nearly identical. Walsh et al. suggested a gravitational lens interpretation in which a single object is split into two images by an intervening massive object. Using the
D. H. Roberts, P. E. Greenfield, B. F. Burke   +2 more
openaire   +1 more source

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

A Cosmic Double Helix in the Archetypical Quasar 3C273

Science, 2001
Finding direct evidence for plasma instability in extragalactic jets is crucial for understanding the nature of relativistic outflows from active galactic nuclei. Our radio interferometric observations of the quasar 3C273 made with the orbiting radio telescope, HALCA, and an array of ground telescopes have yielded an image in which the emission across ...
A P, Lobanov, J A, Zensus
openaire   +2 more sources