Results 151 to 160 of about 2,139,047 (199)

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

WONOEP appraisal: molecular and cellular imaging in epilepsy. [PDF]

Epilepsia, 2015
Lillis KP, Dulla C, Maheshwari A, Coulter D, Mody I, Heinemann U, Armbruster M, Žiburkus J.   +7 more
europepmc   +1 more source

Primordial black holes and their gravitational-wave signatures. [PDF]

Living Rev Relativ
Bagui E, Clesse S, De Luca V, Ezquiaga JM, Franciolini G, García-Bellido J, Joana C, Kumar Jain R, Kuroyanagi S, Musco I, Papanikolaou T, Raccanelli A, Renaux-Petel S, Riotto A, Ruiz Morales E, Scalisi M, Sergijenko O, Ünal C, Vennin V, Wands D, LISA Cosmology Working Group.   +20 more
europepmc   +1 more source

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Relativistic beaming in the central components of double radio quasars

Journal of Astrophysics and Astronomy, 1982
Using a large sample of 78 well-observed double quasars, we have investigated several consequences of the relativistic beaming model. In this model the ratio of the strengths of the central component and outer lobes of a double source depends on whether the jet axis lies close to or away from the line of sight, If this is the actual situation, the ...
V. K. Kapahi, D. J. Saikia
openaire   +2 more sources

Estimation of model parameters in the selected double imaged quasars

Astronomical and Astrophysical Transactions
This article presents the results of modeling based on observations of the gravitationally lensed quasars SDSS J0806+2006 and SDSS J2124+1632 observed at the Maidanak Observatory in 2017-2022 and 2018-2022. The value of the Hubble constant H0= 61.4±7 for the SDSS J0806+2006 GLK is estimated, and the redshift of the lensing galaxy for the SDSS J2124 ...
Dilshod Bekov
openaire   +2 more sources

Parsec-Scale Structure in the Nuclei of Double-Lobed Radio Quasars

1986
A complete sample of double-lobed quasars is defined, which is believed to be randomly oriented and which contains many objects with central components accessible to very-long-baseline interferometry (VLSI). The purpose of defining the sample in this way is to facilitate tests of physical models proposed to explain both the compact and extended ...
D. Hough
openaire   +2 more sources

Quasars: Double Darkness in Draco

Science, 1993
R. Jayawardhana
openaire   +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

Radio structure of the ‘double quasar’ 4C11.50

Nature, 1974
WAMPLER et al.1 have recently announced the discovery of a close pair of optical quasars associated with the radio source 4C11.50. The brighter quasar (a) has a redshift of 0.436, whereas its companion (b), 4.8 arc s away in position angle 95°, has a much larger redshift of 1.901.
D. STANNARD, P. N. WILKINSON, R. S. WARWICK, R. J. DAVIS   +3 more
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Quasar image doubling associated with absorption systems

Nature, 1979
Ever since their discovery the origin of quasar absorption lines has been a subject of considerable controversy (see ref. 1). In this note we consider the consequences of the hypothesis that at least some of the absorption lines arise in galaxies. These galaxies could be ordinary ones with 50–100 kpc haloes2, or perhaps more compact but more common (at
Julian H. Krolik, John Kwan
openaire   +1 more source