Results 1 to 10 of about 1,237,003 (361)
Optical Observations of Radio Jets [PDF]
Highlights of Astronomy, 1980 Over the past several years a considerable body of evidence has accumulated, suggesting that extended radio sources are powered quasi-continuously from the nuclei of their parent galaxies. This view is supported by the recent discovery that several radio galaxies have narrow radio jets which connect their active nuclei with the large radio lobes and ...
Butcher, H.R. +2 more
semanticscholar +7 more sources
An Old Fogey’s History of Radio Jets [PDF]
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 +4 more sources
Scale-invariant radio jets and varying black hole spin [PDF]
, 2016 Compact radio cores associated with relativistic jets are often observed in both active galactic nuclei and X-ray binaries. Their radiative properties follow some general scaling laws which primarily depend on their masses and accretion rates. However, it has been suggested that the black hole spin can also strongly influence the power and radio flux ...
M. Mościbrodzka, H. Falcke, S. Noble
arxiv +3 more sources
A new list of extra-galactic radio jets [PDF]
Published at A&A, 381, 757 (2002), 2002 A catalogue of extra-galactic jets is very useful both in observational and theoretical studies of active galaxies. With the use of new powerful radio instruments, the detailed structures of very compact or weak radio sources are investigated observationally and many new radio jets are detected.
F. K. Liu +3 more
arxiv +3 more sources
Highlights of Astronomy, 1983 The purpose of this review is to outline the systematic properties of radio jets on kpc scales, as derived from the basic observations of surface brightness and linear polarization and to emphasize the uncertainties in the determination of their physical parameters. These results come primarily from observations of about 100 jets with the VLA: a fuller
R. A. Laing
openaire +3 more sources
The bulk kinetic power of radio jets in active galactic nuclei [PDF]
, 2009 Based on the K\"onigl's inhomogeneous jet model, we estimate the jet parameters, such as bulk Lorentz factor $\Gamma$, viewing angle $\theta$ and electron number density $n_{\rm e}$ from radio VLBI and X-ray data for a sample of active galactic nuclei (AGNs) assuming that the X-rays are from the jet rather than the intracluster gas.
M. Gu, Xinwu Cao, D. Jiang
arxiv +3 more sources
The Astrophysical Journal, 1982 The relationship between the radio and optical emissions from the nucleus of the Seyfert galaxy NGC 4151 is investigated by mapping the radio radiation from this source at wavelengths of 20 and 6 cm using the Very Large Array of the National Radio Astronomy Observatory.
Martin Elvis +3 more
openaire +3 more sources
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 Galactic survey of radio jets from massive protostars [PDF]
, 2021 In conjunction with a previous southern-hemisphere work, we present the largest radio survey of jets from massive protostars to date with high-resolution, ($\sim 0.04^{\prime\prime}$) VLA observations towards two subsamples of massive star-forming ...
S. Purser +3 more
semanticscholar +1 more source
Radio jet precession in M 81* [PDF]
Astronomy & Astrophysics, 2023 We report four novel position angle measurements of the core region M 81* at 5 GHz and 8 GHz, which confirm the presence of sinusoidal jet precession in the M 81 jet region, as suggested by Martí-Vidal et al. (2011, A&A, 533, A111). The model makes three testable predictions regarding the evolution of the jet precession, which we test in our data ...
S. D. von Fellenberg +7 more
openaire +2 more sources