A VLBA-uGMRT search for candidate binary black holes: Study of six X-shaped radio galaxies with double-peaked emission lines [PDF]
Monthly Notices of the Royal Astronomical SocietyABSTRACT Identifying methods to discover dual active galactic nucleus (AGN) has proven to be challenging. Several indirect tracers have been explored in the literature, including X/S-shaped radio morphologies and double-peaked (DP) emission lines in the optical spectra.
Biny Sebastian +8 more
+6 more sources
Merger-triggered AGN activity and binary SMBHs in the local universe: X-shaped radio galaxies and double-nucleus disk galaxies [PDF]
Proceedings of Nuclei of Seyfert galaxies and QSOs - Central engine & conditions of star formation — PoS(Seyfert 2012), 2013 Mar Mezcua +4 more
openalex +3 more sources
Scalable precision wide-field imaging in radio interferometry: I. uSARA validated on ASKAP data [PDF]
Monthly notices of the Royal Astronomical Society, 2023 As Part I of a paper series showcasing a new imaging framework, we consider the recently proposed unconstrained Sparsity Averaging Reweighted Analysis (uSARA) optimisation algorithm for wide-field, high-resolution, high-dynamic range, monochromatic ...
A. Wilber +3 more
semanticscholar +1 more source
The Unusual Active Galaxy H1821+643 and the Elusive Nature of FRI Quasars [PDF]
Publications of the Astronomical Society of the Pacific, 2022 The moderate spin estimate for the black hole at the center of the cool core cluster H1821+643 motivates the completion of a story about this object’s origin and evolution that was in the making since the work by Blundell & Rawlings over two decades ago ...
D. Garofalo, C. Singh
semanticscholar +1 more source
GMRT Low-frequency Imaging of an Extended Sample of X-shaped Radio Galaxies [PDF]
The Astronomical Journal, 2019 Abstract We present a low-frequency imaging study of an extended sample of X-shaped radio sources using the Giant Metrewave Radio Telescope (GMRT) at two frequencies (610 and 240 MHz). The sources were drawn from a Very Large Array Radio Images of the Sky at Twenty-Centimeters (FIRST) selected sample and extend an initial GMRT study at ...
D. Lal +3 more
openalex +5 more sources
NGC 326: X-shaped no more [PDF]
Monthly notices of the Royal Astronomical Society, 2019 We present new 144-MHz Low-Frequency Array (LOFAR) observations of the prototypical ‘X-shaped’ radio galaxy NGC 326, which show that the formerly known wings of the radio lobes extend smoothly into a large-scale, complex radio structure.
M. Hardcastle +12 more
semanticscholar +1 more source
“Winged” Radio Sources from the LOFAR Two-meter Sky Survey First Data Release (LoTSS DR1)
Astrophysical Journal Supplement Series, 2022 A small number of extragalactic radio sources disclose a pair of low-surface-brightness radio lobes, known as “wings,” aligned at a certain angle to the primary jets. Such exotic sources are known as “winged” radio sources.
Soumendra Bera +3 more
semanticscholar +1 more source
Cataloguing the radio-sky with unsupervised machine learning: a new approach for the SKA era [PDF]
, 2020 We develop a new analysis approach towards identifying related radio components and their corresponding infrared host galaxy based on unsupervised machine learning methods.
T. Galvin +8 more
semanticscholar +1 more source
VLA Polarimetry of Two Extended Radio Galaxies [PDF]
, 2000 Multi-wavelength VLA observations of two extended radio galaxies, 0235-197 and 1203+043 are presented. There is some evidence from earlier studies that these two sources exhibit low frequency (
Junor, W. +3 more
core +2 more sources
Weak-lensing Analysis of the Complex Cluster Merger A746 with Subaru/Hyper Suprime-Cam
The Astrophysical JournalThe galaxy cluster A746 ( z = 0.214), featuring a double radio relic system, two isolated radio relics, a possible radio halo, disturbed V-shaped X-ray emission, and intricate galaxy distributions, is a unique and complex merging system.
K. HyeongHan +17 more
doaj +1 more source