Results 11 to 20 of about 307 (137)
The optical spectra of X-shaped radio galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 X-shaped radio galaxies are defined by their peculiar large-scale radio morphology. In addition to the classical double-lobed structure they have a pair of low-luminosity wings that straddles the nucleus at almost right angles to the active lobes, thus giving the impression of an 'X'.
Landt, Hermine +2 more
openaire +3 more sources
Orientation and size of the ‘Z’ in X-shaped radio galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2005 Some X-shaped radio galaxies show a Z-symmetric morphology in the less luminous secondary lobes. Within the scenario of a merger between two galaxies, each hosting a supermassive black hole in its center, this structure has been explained before: As the smaller galaxy spirals towards the common center, it releases gas to the ISM of the larger active ...
Gopal-Krishna +2 more
openaire +5 more sources
The Chandra View of Nearby X-shaped Radio Galaxies [PDF]
The Astrophysical Journal, 2009 65 pages in pre-print form incl. 9 figures (multi-page), 7 tables, and notes.
Hodges-Kluck, Edmund +3 more
openaire +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 ...
Gopal-Krishna +3 more
openaire +2 more sources
"Normal" FRII Radio Galaxies as a Probe of the Nature of X-Shaped Radio Sources [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 We present a multiwavelength radio study of a sample of nearby Fanaroff-Riley class II (FRII) radio galaxies, matched with the sample of known X-shaped radio sources in size, morphological properties and redshift, using new Giant Metrewave Radio Telescope (GMRT) data and archival data from the Very Large Array (VLA).
Lal, Dharam Vir +2 more
openaire +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
openaire +2 more sources
Relationship between X-shaped radio sources and double-double radio galaxies [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractBoth the X-shaped radio galaxies and double-double radio galaxies (DDRGs) are suggested in the literature to be due to the binary-accretion disk interaction or to the coalescence of SMBBHs. These models suggest some relationship between the two types of radio sources. In this paper, we collected data from literatures for two samples of X-shaped
Xian Chen, Fukun Liu
openaire +1 more source
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 ...
David H. Roberts +2 more
openaire +1 more source
Host Galaxies of X-Shaped Radio Sources [PDF]
, 2006 The majority of radiation from galaxies containing active galactic nuclei (AGNs) is emitted not by the stars composing the galaxy, but from an active source at the galactic center, most likely a supermassive black hole. Of particular interest are radio galaxies, the active galaxies emitting much of their radiation at radio wavelengths.
Springmann, Alessondra +1 more
openaire +2 more sources
X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure [PDF]
The Astrophysical Journal, 2019 Abstract In pursuit of clues to the origin of “winged” or X-shaped radio galaxies (XRGs) we investigate the parent galaxies of a large sample of 106 XRGs for optical–radio axes alignment, interstellar medium, black hole mass, and large-scale environment.
Ravi Joshi +11 more
openaire +2 more sources