Results 31 to 40 of about 882,791 (313)
CCD observations of galaxies with radio jets [PDF]
Symposium - International Astronomical Union, 1986 We present preliminary results of a CCD survey of nearby (z<0.1) northern galaxies which have well defined radio jets. Our main objectives are to: 1) detect - or put constraints to - the presence of optical jets in these galaxies, 2) obtain high dynamic range maps of known optical jets, and 3) make a detailed comparison of our results with those ...
I. Pérez-Fournon +3 more
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Symposium - International Astronomical Union, 1997 Since thermal radio jets can be observed with subarsecond angular resolution and are unaffected by dust absorption, they provide a useful tool to study collimated outflows very close to the young stars that produce them. Here, I review recent results on this area, giving emphasis to the study of thermal jets in the case of the quadrupolar outflows in ...
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On the efficiency of jet production in radio galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 The mechanisms that produce and power relativistic jets are fundamental open questions in black hole (BH) astrophysics. In order to constrain these mechanisms, we analyze the energy efficiency of jet production 'eta' based on archival Chandra observations of 27 nearby, low-luminosity active galactic nuclei. We obtain 'eta' as the ratio of the jet power,
Nemmen, Rodrigo S. +1 more
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A Panchromatic View of Relativistic Jets in Narrow-Line Seyfert 1 Galaxies
Galaxies, 2016 The discovery by the Large Area Telescope on board Fermi of variable γ-ray emission from radio-loud narrow-line Seyfert 1 (NLSy1) galaxies revealed the presence of a possible third class of Active Galactic Nuclei (AGN) with relativistic jets in addition ...
Filippo D’Ammando +5 more
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Broadband VLA Spectral-line Survey of a Sample of Ionized Jet Candidates
The Astrophysical Journal Supplement Series, 2023 The study of the interaction between ionized jets, molecular outflows, and their environments is critical to understanding high-mass star formation, especially because jets and outflows are thought to be key in the transfer of angular momentum outward ...
E. Sanchez-Tovar +4 more
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Galaxies, 2021 The discovery of 3C 273 in 1963, and the emergence of the Kerr solution shortly thereafter, precipitated the current era in astrophysics focused on using black holes to explain active galactic nuclei (AGN).
Chandra B. Singh +2 more
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Identifying changing jets through their radio variability
, 2021 Context. Supermassive black holes can launch highly relativistic jets with velocities reaching Lorentz factors of as high as Γ > 50. How the jets accelerate to such high velocities and where along the jet they reach terminal velocity are open questions ...
Gurwell, M. A. +13 more
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A STUDY OF RADIO POLARIZATION IN PROTOSTELLAR JETS [PDF]
The Astrophysical Journal, 2016 ABSTRACT Synchrotron radiation is commonly observed in connection with shocks of different velocities, ranging from relativistic shocks associated with active galactic nuclei, gamma-ray bursts, or microquasars, to weakly or non-relativistic flows such as those observed in supernova remnants. Recent observations of synchrotron emission in
Mariana Cécere +6 more
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Magnetic field configurations of radio jets in the double source of radio galaxy
, 1984 As an improvement of resolution of observations, more and more radio galaxies with radiojets have been identified and many fine structures in the radio jets yielded.
胡文瑞
core +2 more sources
Symposium - International Astronomical Union, 1982 Most radio sources are two-sided, like Cygnus A. A minority, however, are one-sided, and the first-known and brightest example is 3C273 (see Fig. 1), a high-luminosity QSO, showing ‘super-luminal’ proper motions in the core. The explanation of such one-sided sources may follow one of two lines (and it seems that both schools of thought are represented ...
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