Results 1 to 10 of about 539 (183)
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
THE EVOLUTION OF EXTRAGALACTIC RADIO SOURCES [PDF]
The Astrophysical Journal, 2010 13 pages, 8 figures, 2 tables, accepted for publication in ...
Luo, Q., Sadler, E. M.
openaire +2 more sources
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
An Atlas of Extragalactic Radio Sources [PDF]
Symposium - International Astronomical Union, 1996 Our Atlas of Extragalactic Radio Sources will present high-quality images of the nearer half of “3CRR”, the sample defined by Laing, Riley & Longair (1983). This is the best-studied complete sample of extragalactic radio sources. All 173 members have secure redshifts and most have been imaged in the radio at high resolution.
Leahy, J.P., Bridle, A., Strom, R.G.
openaire +2 more sources
A tool to understand emission mechanisms of blazars through their high‐energy gamma‐ray emission
Astronomische Nachrichten, Volume 344, Issue 6, August 2023., 2023 The blazar SED is characterized by two energy components. Evidence suggests that the low‐energy component is generated by the synchrotron mechanism, but for the high‐energy component, the mechanism is still uncertain. Two main models have been proposed to explain this emission. According to the leptonic model, a correlation between the emission of both
Mabel Osorio +3 more
wiley +1 more source
Multiwavelength astrophysics of the blazar OJ 287 and the project MOMO
Astronomische Nachrichten, Volume 344, Issue 4, May 2023., 2023 Abstract We are carrying out the densest and longest multiyear, multiwavelength monitoring project of OJ 287 ever done. The project MOMO (Multiwavelength Observations and Modeling of OJ 287) covers wavelengths from the radio to the high‐energy regime. A few selected observations are simultaneous with those of the Event Horizon Telescope (EHT).
S. Komossa +21 more
wiley +1 more source
ROSAT Studies of Extragalactic Radio Sources [PDF]
Symposium - International Astronomical Union, 1996 Complementary information over a large energy range appears to be the best way to study the class properties of Active Galactic Nuclei (AGN). While radio data provide superior spatial resolution required for the analysis of source structures and their morphology, optical data are a necessary ingredient for the classification of the objects and for the ...
W. Brinkmann, J. Siebert, W. Yuan
openaire +1 more source
Extreme accretion events: TDEs and changing‐look AGN
Astronomische Nachrichten, Volume 344, Issue 4, May 2023., 2023 Abstract We present a review of the topics of X‐ray stellar tidal disruption events (TDEs) and changing‐look active galactic nuclei (AGN). Stars approaching a supermassive black hole (SMBH) can be tidally disrupted and accreted. TDEs were first discovered in the X‐ray regime and appear as luminous, giant‐amplitude flares from inactive galaxies.
S. Komossa, D. Grupe
wiley +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
LRS Bianchi Type‐I String Cosmological Models in f(Q) Gravity
Journal of Mathematics, Volume 2023, Issue 1, 2023., 2023 In the current study, we studied a f(Q)‐gravitational, anisotropic, locally rotationally symmetric (LRS), Bianchi type‐I spacetime universe. We have adopted the freely chosen function fQ=Q+αQ, where α is a model‐free parameter. We assumed that the universe is filled with dusty string fluid and that the shear scalar (σ) and the expansion scalar (θ) are ...
Mukesh Kumar +5 more
wiley +1 more source