Results 11 to 20 of about 1,075,291 (208)

The formation, numbers and radio output of giant radio galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 1989
The numbers and mean radio luminosities of giant radio galaxies (GRGs) have been calculated for redshifts up to z = 0.6, assuming a sensitivity limit of 1 Jy at 1 GHz for the observations. The estimates are obtained with a model for the beam propagation, first through the hot gaseaous halo around the parent galaxy, and thereafter, through the even ...
GopalKrishna, *, Wiita, Paul J, Saripalli, L   +2 more
core   +3 more sources

Stellar populations in hosts of giant radio galaxies and their neighbouring galaxies [PDF]

Astronomy & Astrophysics, 2019
Context. Giant radio galaxies (with projected linear size of radio structure larger than 0.7 Mpc) are very rare and unusual objects. Only ∼5% of extended radio sources reach such sizes. Understanding of the processes responsible for their large sizes is crucial to further our knowledge about the radio source’s evolution. Aims.
A. Kuźmicz, B. Czerny, C. Wildy
openaire   +5 more sources

Multi-frequency radio continuum mapping of giant radio galaxies [PDF]

Astronomy and Astrophysics Supplement Series, 1997
The giant radio galaxies NGC 315, DA 240, 3C 236, 3C 326, and NGC 6251 have been observed at 92 cm and 49 cm wavelengths with the Westerbork Synthesis Radio Telescope (WSRT) and at , 6.3 cm, and 2.8 cm using the Effelsberg 100-m telescope. These objects all exhibit strong polarized radio emission across the entire radio frequency domain. Their spectral
K.-H. Mack, U. Klein, C. P. O'Dea, A. G. Willis   +3 more
openaire   +2 more sources

Giant radio galaxies in the LoTSS Boötes deep field [PDF]

, 2022
Giant radio galaxies (GRGs) are radio galaxies that have projected linear extents of more than 700 kpc or 1 Mpc, depending on definition. We have carried out a careful visual inspection in search of GRGs of the Bootes LOFAR Deep Field (BLDF) image at 150 MHz.
Simonte, Marco, Andernach, Heinz, Brüggen, Marcus, Schwarz, Dominik, Prandoni, Isabella, Willis, Anthony G.   +5 more
openaire   +3 more sources

Radio Morphology of Gamma-Ray Sources. II. Giant Radio Galaxies

The Astrophysical Journal
Giant radio sources, including galaxies and quasars (hereafter GRSs), are active galactic nuclei (AGN) hosting relativistic jets with source sizes exceeding a projected length of 0.7 Mpc.
Vaidehi S. Paliya, D. J. Saikia, G. Bruni, Alberto Domínguez, C. S. Stalin   +4 more
doaj   +3 more sources

Giant radio galaxies in the LOFAR deep fields [PDF]

Astronomy & Astrophysics
Context. The reason why some radio galaxies (RGs) grow to form so-called giant radio galaxies (GRGs) with sizes > 700 kpc, is still unknown. Aims. In this study, we compare the radio, optical and environmental properties of GRGs with those of a control sample of smaller RGs we found in the three LOw-Frequency ARray (LOFAR) deep fields, namely the ...
M. Simonte, H. Andernach, M. Brüggen, G. K. Miley, P. Barthel   +4 more
core   +5 more sources

GIANT RADIO GALAXIES IN A MEERKAT LEGACY SURVEY [PDF]

, 2023
This study makes the use of legacy data from MeerKAT radio telescope in the vicinity of the Galactic center to look for Giant Radio Galaxies (GRGs) in the field.
Preet Jigneshkumar Agnihotri
openaire   +2 more sources

Radio Galaxy Zoo: new giant radio galaxies in the RGZ DR1 catalogue [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACT In this paper, we present the identification of five previously unknown giant radio galaxies (GRGs) using Data Release 1 of the Radio Galaxy Zoo citizen science project and a selection method appropriate to the training and validation of deep learning algorithms for new radio surveys.
H Tang, A M M Scaife, O I Wong, A D Kapińska, L Rudnick, S S Shabala, N Seymour, R P Norris   +7 more
openaire   +3 more sources

The dynamics of the giant radio galaxy 3C���457 [PDF]

Monthly Notices of the Royal Astronomical Society, 2009
We present multi-frequency radio observations with the Giant Metrewave Radio Telescope and Very Large Array, and X-ray observations with the X-ray Multi-Mirror Mission ({\it XMM-Newton}) telescope of the giant radio source (GRS) 3C 457. We have detected the core, lobes and the environment of the GRS in X-ray.
Konar, C., Hardcastle, M. J., Croston, J. H., Saikia, D. J.   +3 more
openaire   +4 more sources

Radio Galaxy Zoo: giant radio galaxy classification using multidomain deep learning [PDF]

Monthly Notices of the Royal Astronomical Society, 2021
ABSTRACT In this work we explore the potential of multidomain multibranch convolutional neural networks (CNNs) for identifying comparatively rare giant radio galaxies from large volumes of survey data, such as those expected for new generation radio telescopes like the SKA and its precursors.
H Tang, A M M Scaife, O I Wong, S S Shabala   +3 more
openaire   +2 more sources