LOFAR discovery of an ultra-steep radio halo and giant head-tail radio galaxy in Abell 1132

Abstract

LOFAR observations at 144 MHz have revealed large-scale radio sources in the unrelaxed galaxy cluster Abell 1132. The cluster hosts diffuse radio emission on scales of $\sim$650 kpc near the cluster center and a head-tail (HT) radio galaxy, extending up to 1 Mpc, South of the cluster center. The central diffuse radio emission is not seen in NVSS, FIRST, WENSS, nor in C & D array VLA observations at 1.4 GHz, but is detected in our follow-up GMRT observations at 325 MHz. Using LOFAR and GMRT data, we determine the spectral index of the central diffuse emission to be $\alpha =-1.75\pm 0.19$ ($S\propto {\nu }^{\alpha }$). We classify this emission as an ultra-steep spectrum radio halo and discuss the possible implications for the physical origin of radio halos. The HT radio galaxy shows narrow, collimated emission extending up to 1 Mpc and another 300 kpc of more diffuse, disturbed emission, giving a full projected linear size of 1.3 Mpc - classifying it as a giant radio galaxy (GRG) and making it the longest HT found to date. The head of the GRG coincides with an elliptical galaxy (SDSS J105851.01$+$564308.5) belonging to Abell 1132. In our LOFAR image, there appears to be a connection between the radio halo and the GRG. The turbulence that may have produced the halo may have also affected the tail of the GRG. In turn, the GRG may have provided seed electrons for the radio halo.

arXiv commentAccepted to MNRAS, 12 pages, 8 figures

References in corpus (56)

• LOFAR: The LOw-Frequency ARray
• The Second Data Release of the Sloan Digital Sky Survey
• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• Calibration of X-ray absorption in our Galaxy
• Galaxy cluster X-ray luminosity scaling relations from a representative local sample (REXCESS)
• The LOFAR Two-metre Sky Survey - I. Survey Description and Preliminary Data Release
• Cosmic rays in galaxy clusters and their non-thermal emission
• Chandra temperature profiles for a sample of nearby relaxed galaxy clusters
• Planck 2013 results. XXIX. Planck catalogue of Sunyaev-Zeldovich sources
• Particle reacceleration in Coma cluster: radio properties and hard X-ray emission
• Turbulence and Magnetic Fields in the Large Scale Structure of the Universe
• On The Non Thermal Emission and Acceleration of Electrons in Coma and Other Clusters of Galaxies
• A broadband flux scale for low frequency radio telescopes
• Cosmic Rays, Radio Halos and Non-Thermal X-ray Emission in Clusters of Galaxies
• LOFAR facet calibration
• Constraining the population of cosmic ray protons in cooling flow clusters with gamma-ray and radio observations: Are radio mini-halos of hadronic origin?
• A low-frequency radio halo associated with a cluster of galaxies
• LOFAR 150-MHz observations of the Boötes field: Catalogue and Source Counts
• Halo and Relic Sources in Clusters of Galaxies
• Revisiting scaling relations for giant radio halos in galaxy clusters
• The Case for Electron Re-Acceleration at Galaxy Cluster Shocks
• Statistics of Giant Radio Halos from Electron Reacceleration Models
• The diffuse radio emission from the Coma cluster at 2.675 GHz and 4.85 GHz
• Cosmic ray transport in galaxy clusters: implications for radio halos, gamma-ray signatures, and cool core heating
• On the evolution of giant radio halos and their connection with cluster mergers
• Shock Waves in Eulerian Cosmological Simulations: Main Properties and Acceleration of Cosmic Rays
• GeV Gamma-ray Flux Upper Limits from Clusters of Galaxies
• Discovery of radio halos and double-relics in distant MACS galaxy clusters: clues to the efficiency of particle acceleration
• Cosmic rays and Radio Halos in galaxy clusters : new constraints from radio observations
• Alfvenic reacceleration of relativistic particles in galaxy clusters: MHD waves, leptons and hadrons
• Rise and Fall of Radio Halos in Simulated Merging Galaxy Clusters
• Turbulence and Vorticity in Galaxy Clusters Generated by Structure Formation
• Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data
• On the occurrence of Radio Halos in galaxy clusters - Insight from a mass-selected sample
• The Lockman Hole project: LOFAR observations and spectral index properties of low-frequency radio sources
• Probing the origin of giant radio halos through radio and gamma-ray data : the case of the Coma cluster
• A giant radio halo in the cool core cluster CL1821+643
• Radio Halos in future surveys in the radio continuum
• A Complete Sample of Megaparsec Size Double Radio Sources from SUMSS
• Wideband VLA Observations of Abell 2256 I: Continuum, Rotation Measure and Spectral Imaging
• Implications of Fermi Observations for Hadronic Models of Radio Halos in Clusters of Galaxies
• A plethora of diffuse steep spectrum radio sources in Abell 2034 revealed by LOFAR
• VLSS Redux: Software Improvements applied to the Very Large Array Low-frequency Sky Survey
• The very steep spectrum radio halo in Abell 697
• Radio Halos From Simulations And Hadronic Models I: The Coma cluster
• Dynamics and Magnetization in Galaxy Cluster Cores Traced by X-ray Cold Fronts
• 153 MHz GMRT follow-up of steep-spectrum diffuse emission in galaxy clusters
• An Objective Survey of Mpc-Scale Radio Emission in 0.03<z<0.3 Bright X-ray Clusters
• Radio Halos From Simulations And Hadronic Models II: The Scaling Relations of Radio Halos
• Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies
• The scaling relations and the fundamental plane for radio halos and relics of galaxy clusters
• On the cosmological evolution of the FRII radio source population
• ATCA observations of the MACS-Planck Radio Halo Cluster Project - I. New detection of a radio halo in PLCK G285.0-23.7
• Bent-Tailed Radio Sources in the Australia Telescope Large Area Survey of the Chandra Deep Field-South
• GMRT observations of IC 711 -- The longest head-tail radio galaxy known

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• The Planck clusters in the LOFAR sky. I. LoTSS-DR2: new detections and sample overview
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• Statistical Properties of Radio Halos in Galaxy Clusters and Origin of Seed Electrons for Reacceleration
• LOFAR discovery of a radio halo in the high-redshift galaxy cluster PSZ2 G099.86+58.45
• A MeerKAT-meets-LOFAR study of Abell 1413: a moderately disturbed non-cool-core cluster hosting a $\sim 500$ kpc 'mini'-halo
• The merging galaxy cluster Abell 3266 at low radio frequencies
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• The diffuse radio emission in the high-redshift cluster PSZ2 G091.83+26.11: total intensity and polarisation analysis with Very Large Array 1-4 GHz observations
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• Double radio relics and radio halo in the high redshift galaxy cluster El Gordo with the Upgraded GMRT
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