Results 31 to 40 of about 38,529 (262)

A galactic microquasar mimicking winged radio galaxies

Nature Communications, 2017
Winged radio galaxies possess wing features detectable at radio wavelengths, yet the physical interpretation of such extragalactic radio sources remains elusive.
Josep Martí, Pedro L. Luque-Escamilla, Valentí Bosch-Ramon, Josep M. Paredes   +3 more
doaj   +1 more source

Depolarization of Extragalactic Radio Sources [PDF]

Symposium - International Astronomical Union, 1982
In the last decade correlations of the depolarization parameter λd with several parameters, i.e., the radio luminosity L, redshift z, and source size D have been investigated by several authors, where λd is the wavelength at which the percentage polarization drops to its half maximum. Kronberg ET AL.
M. Inoue, H. Tabara
openaire   +1 more source

An Old Fogey’s History of Radio Jets

Galaxies, 2017
This paper describes a personal view of the discovery of radio jets in celestial radio sources. The existence of narrow, collimated optical features in distant objects has been known about since the early 20th century; however, the advent of radio ...
Ralph Spencer
doaj   +1 more source

A Search for Sub-millisecond Pulsations in Unidentified FIRST and NVSS Radio Sources [PDF]

, 1999
We have searched 92 unidentified sources from the FIRST and NVSS 1400 MHz radio survey catalogs for radio pulsations at 610 MHz. The selected radio sources are bright, have no identification with extragalactic objects, are point-like and are more than 5%
Fronefield Crawford, Jon F. Bell, Kulkarni S. R., Lorimer D. R., Lorimer D. R., Lyne A. G., Victoria M. Kaspi   +6 more
core   +3 more sources

Summing up Ultra-High-Energy Cosmic Rays from Radio Galaxies [PDF]

, 2018
Radio galaxies are intensively discussed as the sources of cosmic rays observed above about 3 EeV, called ultra-high-energy cosmic rays (UHECRs). Here, the key issues from a recent investigation are summed up, where the individual characteristics of ...
Eichmann, Björn
core   +3 more sources

Optical and radio properties of giant radio quasars: Central black hole characteristics

, 2012
We analysed the optical and radio properties of lobe-dominated giant-sized (> 0.72 Mpc) radio quasars and compared the results with those derived for a sample of smaller radio sources to determine whether the large size of some extragalactic radio ...
Jamrozy, M., Kuźmicz, A.
core   +1 more source

Modelling the Multifrequency SED of AGN Candidates among the Unidentied EGRET and Fermi Gamma-Ray Sources

Acta Polytechnica CTU Proceedings, 2014
Of the 271 sources in the 3rd EGRET catalogue, 131 were reported as unidentied, i.e. not associated with any particular class of point source in the sky.
Pieter J. Meintjes, Pheneas Nkundabakura, Brian van Soelen, Alida Odendaal   +3 more
doaj   +1 more source

Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era

Galaxies, 2016
The multi-epoch single-survey Planck satellite data have given a rare glimpse into how the radio spectra of active galactic nuclei (AGN) evolve in time.
Anne Lähteenmäki, the Planck Collaboration   +1 more
doaj   +1 more source

Identification of the Early Fermi LAT Gamma-Ray Bright Objects with Extragalactic VLBI sources

, 2009
A list of 205 gamma-ray strong objects was reported recently as a result of a 3-month integration with the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope.
Abdo, Abdo, Atwood, Bassani, Beasley, Fey, Fomalont, Fomalont, Hartman, Healey, Healey, Helmboldt, Kovalev, Kovalev, Kovalev, Lanyi, Lee, Lister, Lister, Lovell, Lähteenmäki, Ma, Mattox, Mirabal, Mirabal, Ojha, Petrov, Petrov, Petrov, Petrov, Pollack, Sowards-Emmerd, Sowards-Emmerd, Y. Y. Kovalev   +33 more
core   +1 more source

Radio source stacking and the infrared / radio correlation at microJy flux densities

, 2008
We investigate the infrared / radio correlation using the technique of source stacking, in order to probe the average properties of radio sources that are too faint to be detected individually.
Afonso, Appleton, Becker, Bertin, Beswick, Biggs, Boyle, Carilli, Condon, de Jong, de Vries, Fadda, Fadda, Fazio, Frayer, Garn, Garn, Garn, Garrett, Helou, Hodge, Ibar, Ivison, Lacy, Lonsdale, Murphy, Norris, Paul Alexander, Prandoni, Rowan-Robinson, Roy, Sanders, Shupe, Sopp, Timothy Garn, Wals, Werner, White, Yun, Zheng, Zheng, Zibetti   +41 more
core   +2 more sources