Results 1 to 10 of about 375 (147)
Simulations of Precessing Jets and the Formation of X-shaped Radio Galaxies [PDF]
The Astrophysical Journal, 2023 Jet precession is sometimes invoked to explain asymmetries in radio galaxy (RG) jets and “X/S/Z-shaped” RGs, caused by the presence of a binary black hole companion to the source active galactic nucleus or by accretion instabilities.
Chris Nolting, Jay Ball, Tri M. Nguyen
doaj +6 more sources
Restarting engine in an X-shaped radio galaxy [PDF]
Proceedings of From Planets to Dark Energy: the Modern Radio Universe — PoS(MRU), 2008 J2018-556, an X-shaped FR-I radio galaxy provides a unique opportunity to discuss the formation scenarios for the extended structures seen in this class of radio sources. An understanding of the origin of X-shaped source structures has important implications for radio galaxy models as well as black hole-black hole mergers.
L. Saripalli +3 more
+7 more sources
Spectral index variation across X-shaped radio galaxies [PDF]
, 2023 20 pages, 2 figures, 2 tables, accepted for publication in ...
Dusmanta Patra +2 more
openalex +3 more sources
A Unified Framework for X-shaped Radio Galaxies
The Astrophysical Journal, 2020 Abstract We propose a radically different picture for X-shaped radio galaxies compared with existing models as transition objects between cold-mode accreting, low-spinning retrograde black holes and low-spinning prograde black holes. This model explains their smaller average black hole masses; their general aversion for cluster compared ...
David Garofalo +5 more
openalex +3 more sources
Bridging the Bondi and Event Horizon Scales: 3D GRMHD Simulations Reveal X-shaped Radio Galaxy Morphology [PDF]
The Astrophysical Journal Letters, 2022 Abstract X-shaped radio galaxies (XRGs) produce misaligned X-shaped jet pairs and make up ≲10% of radio galaxies. XRGs are thought to emerge in galaxies featuring a binary supermassive black hole (SMBH), SMBH merger, or large-scale ambient medium asymmetry.
Aretaios Lalakos +8 more
+6 more sources
X-shaped radio galaxy 3C 223.1: A ‘double boomerang’ with an anomalous spectral gradient [PDF]
Astronomy & Astrophysics, 2022 A comparison of the recent LOFAR 144 MHz map of the radio source 3C 223.1 (J094124.028+394441.95) with the VLA maps at 4.9 GHz and 8.3 GHz that we built based on archival data, establishes this X-shaped radio galaxy (XRG) as a singularly robust case where the ‘wings’ exhibit a distinctly flatter radio spectrum than the primary lobes. The details of its
Gopal Krishna, Pratik Dabhade
openalex +3 more sources
On the origin of X-shaped radio galaxies [PDF]
Research in Astronomy and Astrophysics, 2012 After a brief, critical review of the leading explanations proposed for the small but important subset of radio galaxies showing an X-shaped morphology (XRGs) we propose a generalized model, based on the jet-shell interaction and spin-flip hypotheses. The most popular scenarios for this intriguing phenomenon invoke either hydrodynamical backflows and ...
Peter L. Biermann +2 more
openalex +4 more sources
Discovery of X-shaped morphology of the giant radio galaxy 0503-286 [PDF]
Astronomy & Astrophysics, 2022 The high surface-brightness sensitivity of the galactic and extragalactic all-sky mwa survey (GLEAM) image of the giant radio galaxy (GRG) 0503-28 at 70–230 MHz has revealed an inversion-symmetric bending of its two lobes, while maintaining a ∼200 kpc wide strip-like radio emission gap between their bent portions.
Pratik Dabhade, Gopal Krishna
openalex +5 more sources
Starbursts and black hole masses in X-shaped radio galaxies: Signatures of a merger event? [PDF]
Astronomy & Astrophysics, 2012 9 pages, 10 figures, accepted for publication in Astronomy & ...
Mar Mezcua +3 more
+8 more sources
X-Shaped Radio Galaxies and the Nanohertz Gravitational Wave Background [PDF]
Proceedings of the International Astronomical Union, 2015 AbstractCoalescence of supermassive black holes (SMBHs) in galaxy mergers is potentially the dominant contributor to the low frequency gravitational wave background (GWB). It was proposed by Merritt & Ekers that X-shaped radio galaxies are signposts of such coalescences and that their abundance might be used to predict the magnitude of the GWB ...
D. H. Roberts +2 more
openalex +2 more sources