Hydrodynamical Backflow in X-shaped Radio Galaxy PKS 2014-55

Abstract

We present MeerKAT 1.28 GHz total-intensity, polarization, and spectral-index images covering the giant (projected length $l\approx 1.57$~Mpc) X-shaped radio source PKS~2014$-$55 with an unprecedented combination of brightness sensitivity and angular resolution. They show the clear "double boomerang" morphology of hydrodynamical backflows from the straight main jets deflected by the large and oblique hot-gas halo of the host galaxy PGC~064440. The magnetic field orientation in PKS~2014$-$55 follows the flow lines from the jets through the secondary wings. The radio source is embedded in faint ($T_{\mathrm{b}}\approx 0.5\mathrm{K}$) cocoons having the uniform brightness temperature and sharp outer edges characteristic of subsonic expansion into the ambient intra-group medium. The position angle of the much smaller ($l\sim 25$~kpc) restarted central source is within $5^{\circ }$ of the main jets, ruling out models that invoke jet re-orientation or two independent jets. Compression and turbulence in the backflows probably produce the irregular and low polarization bright region behind the apex of each boomerang as well as several features in the flow with bright heads and dark tails.

arXiv comment13 pages, 11 figures

References in corpus (29)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Cosmic Microwave Background Spectrum from the Full COBE/FIRAS Data Set
• The 6dF Galaxy Survey: Final Redshift Release (DR3) and Southern Large-Scale Structures
• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. II. The Source Catalogue
• The Connection between Galaxies and their Dark Matter Halos
• Faraday Rotation Measure Synthesis
• The Dark Energy Survey Data Release 1
• The K-Band Galaxy Luminosity Function
• Revised equipartition & minimum energy formula for magnetic field strength estimates from radio synchrotron observations
• A 20cm VLA Survey of Abell Clusters of Galaxies VI. Radio/Optical Luminosity Functions
• Tracing Black Hole Mergers Through Radio Lobe Morphology
• Revival of the magnetar PSR J1622-4950: observations with MeerKAT, Parkes, XMM-Newton, Swift, Chandra, and NuSTAR
• Giant Radio Sources
• Effect of environment on galaxies mass-size distribution: unveiling the transition from outside-in to inside-out evolution
• Jet reorientation in AGN: two winged radio galaxies
• The 1.28 GHz MeerKAT DEEP2 Image
• On the origin of X-shaped radio-sources: new insights from the properties of their host galaxies
• $\Lambda$CDM Cosmology for Astronomers
• The genesis of morphologies in extended radio sources: X-shapes, off-axis distortions and giant radio sources
• Where Do Galaxies End?
• Giant radio galaxies - II. Tracers of large-scale structure
• NGC 326: X-shaped no more
• Angular Sizes of $\mu$Jy Radio Sources
• The first Murchison Widefield Array low frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667
• Giant Radio Galaxies: I. Intergalactic Barometers
• The Chandra View of Nearby X-shaped Radio Galaxies
• The column density distribution of hard X-ray radio galaxies
• X-shaped Radio Galaxies: Optical Properties, Large-scale Environment and Relationship to Radio Structure
• The Ultraviolet Detection of Diffuse Gas in Galaxy Groups

Cited by in corpus (42)

• Electromagnetic Counterparts to Massive Black Hole Mergers
• CNN Architecture Comparison for Radio Galaxy Classification
• MIGHTEE: Are giant radio galaxies more common than we thought?
• Threads, Ribbons, and Rings in the Radio Galaxy IC 4296
• The galaxy group NGC 507: newly detected AGN remnant plasma transported by sloshing
• 3D Hydrodynamic Simulations of Large-Scale Precessing Jets: Radio Morphology
• Decoding the giant extragalactic radio sources
• Modelling X-shaped Radio Galaxies: Dynamical and Emission Signatures from the Back-flow model
• The great Kite in the sky: a LOFAR observation of the radio source in Abell 2626
• Giant radio galaxies in the LoTSS Boötes deep field
• Dynamical Modelling and Emission Signatures of a Candidate Dual AGN with Precessing Radio Jets
• Simulations of Precessing Jets and the Formation of X-shaped Radio Galaxies
• The Dynamics and Energetics of Remnant and Restarting RLAGN
• Scalable precision wide-field imaging in radio interferometry: II. AIRI validated on ASKAP data
• Hard X-ray selected giant radio galaxies -- III. The LOFAR view
• Scalable precision wide-field imaging in radio interferometry: I. uSARA validated on ASKAP data
• A new look at old friends. I. Imaging classical radio galaxies with uGMRT and MeerKAT
• A low frequency sub-arcsecond view of powerful radio galaxies in rich-cluster environments: 3C 34 and 3C 320
• A Polarimetric Study of 9 PG Quasars with the VLA
• Identifying anomalous radio sources in the EMU Pilot Survey using a complexity-based approach
• Multifrequency analysis of the radio emission from a post-merger galaxy CGCG 292-057
• Powerful Radio Sources in the Southern Sky. I. Optical Identifications
• Revealing the Unusual Structure of the KAT-7-Discovered Giant Radio Galaxy J0133$-$1302
• Complex morphology and precession indicators of AGN jets in LoTSS DR2
• X-shaped radio galaxy 3C 223.1: A 'double boomerang' with an anomalous spectral gradient
• J0011+3217: A peculiar radio galaxy with a one-sided secondary lobe and misaligned giant primary lobes
• The X-shaped radio galaxy J0725+5835 is associated with an AGN pair
• Jet interaction with galaxy cluster mergers
• Disc galaxy resolved in HI absorption against the radio lobe of 3C 433: Case study for future surveys
• Discovery of X-shaped Morphology of the Giant Radio Galaxy GRG 0503-286
• Studying the link between radio galaxies and AGN fuelling with relativistic hydrodynamic simulations of flickering jets
• The technological and scientific development of ASKAP
• From 100 MHz to 10 GHz: Unveiling the spectral evolution of the X-shaped radio galaxy in Abell 3670
• The radio source in Abell 980: A Detached-Double-Double Radio Galaxy?
• The Curious Case of the "Heartworm" Nebula
• An ACA 1mm survey of HzRGs in the ELAIS-S1: survey description and first results
• Bridging Bondi and Event Horizon Scales: 3D GRMHD Simulations Reveal X-Shaped Radio Galaxy Morphology
• IGR J18249-3243: a new GeV-emitting FR II and the emerging population of high energy radio galaxies
• Circular Mystery: Exploring Diffuse Emission Surrounding a Radio Galaxy with uGMRT and VLA Multiwavelength Observations
• A MeerKAT 1.28 GHz Atlas of Southern Sources in the IRAS Revised Bright Galaxy Sample
• HI gas in the rejuvenated radio galaxy PKS 2014-55
• Wide-field GMRT imaging of X-shaped Radio-Galaxies: Spectral properties of 4C32.25 and 4C61.23