Results 21 to 30 of about 37,310 (215)

A search for candidate radio supernova remnants in the nearby irregular starburst galaxies NGC 4214 and NGC 4395 [PDF]

Serbian Astronomical Journal, 2005
We present the results of a search for new candidate radio su­pernova remnants (SNRs) in the nearby starburst irregular galaxies NGC 4214 and NGC 4395 using archived radio observations made with the Very Large Array (VLA) at the wavelengths of 3.5 cm, 6 ...
Vukotić B., Bojičić I., Pannuti T.G., Urošević Dejan V.   +3 more
doaj   +1 more source

Radio properties of Compact Steep Spectrum and GHz-Peaked Spectrum radio sources [PDF]

, 2015
Compact steep spectrum (CSS) and GHz-peaked spectrum (GPS) radio sources represent a large fraction of the extragalactic objects in flux density-limited samples.
Alexander, Araya, Bicknell, Brocksopp, Burns, Cassaro, Conway, Cotton, Cotton, Dallacasa, Dallacasa, Dallacasa, Dasyra, Fanaroff, Fanti, Fanti, Fanti, Fanti, Fanti, Fanti, Garcia-Burillo, Giroletti, Gugliucci, Gupta, Hancock, Kellermann, Kunert, Kunert-Bajraszewska, Kunert-Bajraszewska, Kunert-Bajraszewska, Labiano, Luo, Mack, Mantovani, Mantovani, Mantovani, Marr, Marr, Mingaliev, Morganti, Morganti, Morganti, Morganti, Morganti, Murgia, Murgia, Murgia, Nagai, O'Dea, Ocaña-Flaquer, Orienti, Orienti, Orienti, Orienti, Orienti, Orienti, Orienti, Orienti, Parma, Peck, Peck, Pihlström, Polatidis, Polatidis, Readhead, Rossetti, Rossetti, Rossetti, Saikia, Saikia, Scott, Shulevski, Siemiginowska, Snellen, Snellen, Snellen, Spencer, Stanghellini, Stanghellini, Sutherland, Tingay, Tingay, Tinti, Torniainen, Torniainen, Tremblay, Vermeulen, Wilkinson   +87 more
core   +2 more sources

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

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

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

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

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

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

Clusters of Extragalactic Ultra Compact HII Regions [PDF]

, 2001
We report on the detection of optically thick free-free radio sources in the galaxies M33, NGC 253, and NGC 6946 using data in the literature. We interpret these sources as being young, embedded star birth regions, which are likely to be clusters of ...
Bianchi S., Boulesteix J., Courtes G., De Pree C. G., Duric N., Garcia-Gomez C., Henry A. Kobulnicky, Kelsey E. Johnson, Larsen S. S., Peter S. Conti, Philip Massey, Smith L. F., Tarchi A., Weiler K. W., Westerhout G.   +14 more
core   +2 more sources