Results 1 to 10 of about 37,734 (223)
Changing-Look AGNs or Short-Lived Radio Sources? [PDF]
Frontiers in Astronomy and Space Sciences, 2017 The evolution of extragalactic radio sources has been a fundamental problem in the study of active galactic nuclei for many years. A standard evolutionary model has been created based on observations of a wide range of radio sources.
Aleksandra Wołowska +3 more
doaj +6 more sources
Environment of compact extragalactic radio sources [PDF]
, 2006 We have studied the interrelation of young AGN with their hosts. The objects of study are the young and powerful GPS and CSS radio sources. Due to their small size, GPS and CSS sources are excellent probes of this relation.
Barthel, P. D. +3 more
core +5 more sources
50 YEARS OF RESEARCH IN CONTINUUM AT THE UTR-2 RADIO TELESCOPE [PDF]
Radio Physics and Radio Astronomy, 2021 Purpose: The results of research in continuum decameter-wave radio emission of the Galaxy background, ionized hydrogen regions, supernova remnants, extragalactic discrete sources, extended galaxies, galactic clusters, extragalactic background are given ...
M. A. Sidorchuk +7 more
doaj +1 more source
Powerful Radio Sources in the Southern Sky. I. Optical Identifications
The Astrophysical Journal Supplement Series, 2023 Since the early sixties, our view of radio galaxies and quasars has been drastically shaped by discoveries made thanks to observations of radio sources listed in the Third Cambridge Catalog and its revised version (3CR).
F. Massaro +20 more
doaj +1 more source
ENVIRONMENT DENSITY OF A GIANT RADIO STRUCTURE FOR GALAXIES AND QUASARS WITH STEEP RADIO SPECTRA [PDF]
Radio Physics and Radio Astronomy, 2021 Purpose: Estimate of the environment density of giant (with the linear size of about megaparsec) radio structures for galaxies and quasars with steep low-frequency spectra taken from the UTR-2 catalogue. Study of the cosmological evolution of environment
A. P. Miroshnichenko
doaj +1 more source
A Comprehensive Observational Study of the FRB 121102 Persistent Radio Source
The Astrophysical Journal, 2023 FRB 121102 is the first fast radio burst to be spatially associated with a persistent radio source (QRS 121102), the nature of which remains unknown. We constrain the physical size of QRS 121102 by measuring its flux-density variability with the VLA from
Ge Chen, Vikram Ravi, Gregg W. Hallinan
doaj +1 more source
A Wideband Polarization Observation of Hydra A with the Jansky Very Large Array
The Astrophysical Journal, 2023 We present the results of a wideband high-resolution polarization study of Hydra A, one of the most luminous FR I radio galaxies known and among the most well studied. The radio emission from this source displays extremely large Faraday rotation measures
Lerato Baidoo +5 more
doaj +1 more source
CATALOG OF VARIABILITY PERIODS OF EXTRAGALACTIC RADIO SOURCES AT CENTIMETER WAVELENGTHS
Radio Physics and Radio Astronomy, 2016 Purpose: Study of the variability of flux density of extragalactic radio sources (3C 273, 3C 120, 3C 345, 3C 446, 3C 454.3, OJ 287, OT 081, BL Lac, DA 55, CTA 102) according to a long-term (1965–2011) monitoring at 14.5, 8, 4.8 GHz made with a 26-m ...
M. I. Ryabov +2 more
doaj +1 more source
Radio Physics and Radio Astronomy, 2017 Purpose: From April 2017, a monitoring program of observations has been started at the RT-16 telescope of Ventspils Radio Astronomy Center (frequencies 5, 6.1, 6.7, 8.4 GHz) to study the intraday and interdiurnal variability of extragalactic radio ...
A. L. Sukharev +4 more
doaj +1 more source
Luminous Radio Emission from the Superluminous Supernova 2017ens at 3.3 yr after Explosion
The Astrophysical Journal Letters, 2023 We present the results from a multiyear radio campaign of the superluminous supernova (SLSN) SN 2017ens, which yielded the earliest radio detection of an SLSN to date at the age of ∼3.3 yr after explosion. SN 2017ens was not detected at radio frequencies
Raffaella Margutti +19 more
doaj +1 more source