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Abell 1430: A merging cluster with exceptional diffuse radio emission

Journal Article · · Astronomy and Astrophysics
 [1];  [2];  [1];  [3];  [4];  [5];  [6];  [1];  [6];  [7];  [8];  [7];  [9];  [6];  [4];  [10];  [11];  [12];  [13]
  1. Karl Schwarzschild Observatory (Germany)
  2. Mbarara University of Science & Technology (Uganda); Karl Schwarzschild Observatory (Germany)
  3. Univ. of Bologna (Italy); Istituto Nazionale di Astrofisica (INAF), Bologna (Italy); Karl Schwarzschild Observatory (Germany)
  4. Istituto Nazionale di Astrofisica (INAF), Milano (Italy)
  5. Institute of Astronomy and Space Physics (Argentina); Univ. of Buenos Aires (Argentina)
  6. Leiden Univ. (Netherlands)
  7. Istituto Nazionale di Astrofisica (INAF), Bologna (Italy)
  8. Netherlands Institute for Radio Astronomy (Netherlands); Leiden Univ. (Netherlands)
  9. Univ. of Hamburg (Germany)
  10. Istituto Nazionale di Astrofisica (INAF), Bologna (Italy). Osservatorio di Astrofisica e Scienza dello Spazio di Bologna (OAS); Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  11. Autonomous University of Madrid (Spain)
  12. Istituto Nazionale di Astrofisica (INAF), Bologna (Italy). Osservatorio di Astrofisica e Scienza dello Spazio di Bologna (OAS)
  13. Univ. of Geneva (Switzerland)
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Diffuse radio emission has been found in many galaxy clusters, predominantly in massive systems which are in the state of merging. The radio emission can usually be classified as relic or halo emission, which are believed to be related to merger shocks or volume-filling turbulence, respectively. Recent observations have revealed radio bridges for some pairs of very close galaxy clusters. The mechanisms that may allow one to explain the high specific density of relativistic electrons, which are necessary to explain the radio luminosity of these bridge regions, have been poorly explored until now. When inspecting the first data release of the LOFAR Two-Metre Sky Survey (LoTSS), we discovered diffuse radio emission in the galaxy cluster Abell 1430. Here, for this work, we aim to determine the dynamical state of the cluster and characterise the diffuse radio emission. We analysed the LoTSS data in detail and complemented them with recent Karl G. Jansky Very Large Array observations in the L-band. To study the dynamical state of the cluster, we analysed XMM-Newton data, Chandra data, and Sloan Digital Sky Survey data. Moreover, we compared our results to clusters extracted from THE THREE HUNDRED PROJECT cosmological simulation. We find that Abell 1430 consists of two components, namely A1430-A and A1430-B, with a mass ratio of about 2:1. The massive component shows diffuse radio emission which can be classified as radio halo which shows a low radio power at 1.4 GHz with respect to the mass of the cluster. Most interestingly, there is extended diffuse radio emission in the following dubbed as the ‘Pillow’ according to its morphology, which is apparently related to A1430-B and which is neither typical halo nor typical relic emission. The origin of this emission is puzzling. We speculate that the two components of Abell 1430 undergo an off-axis merger. In this scenario, A1430-B is moving towards the main cluster component and may have compressed and stirred the medium in the filament between the two cluster components. We have discovered evidence for diffuse radio emission related to the low-density intracluster or intergalactic medium in Abell 1430. To date, only a few examples of emission originating from such regions are known. These discoveries are crucial to constrain possible acceleration mechanisms which may allow us to explain the presence of relativistic electrons in these regions. In particular, our results indicate a spectral index of α144 MHz1.5 GHz = -1.4±0.5 for the Pillow. If upcoming observations confirm a slope as flat as -1.4 or even flatter, this would pose a challenge for the electron acceleration scenarios.
Research Organization:
US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)
Sponsoring Organization:
Alfred P. Sloan Foundation; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE
OSTI ID:
1982272
Journal Information:
Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 654; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

References (59)

The XMM cluster outskirts project (X-COP): ECKERT et al. journal March 2017
Clusters of galaxies: observational properties of the diffuse radio emission journal May 2012
Diffuse Radio Emission from Galaxy Clusters journal February 2019
X-ray properties in massive galaxy clusters: XMM-Newton observations of the REFLEX-DXL sample (Corrigendum) journal January 2011
Galaxy cluster X-ray luminosity scaling relations from a representative local sample (REXCESS) journal March 2009
Radio halos in nearby ( z < 0.4) clusters of galaxies journal October 2009
Planck early results. I. The Planck mission journal December 2011
The “toothbrush-relic”: evidence for a coherent linear 2-Mpc scale shock wave in a massive merging galaxy cluster? journal October 2012
First LOFAR observations at very low frequencies of cluster-scale non-thermal emission: the case of Abell 2256 journal June 2012
The extended ROSAT-ESO flux limited X-ray galaxy cluster survey (REFLEX II) II. Construction and properties of the survey journal June 2013
LOFAR: The LOw-Frequency ARray journal July 2013
Nonlinear Kalman filters for calibration in radio interferometry journal June 2014
Planck 2013 results. XXXII. The updated Planck catalogue of Sunyaev-Zeldovich sources journal August 2015
Planck 2015 results : XXVII. The second journal September 2016
Relics in galaxy clusters at high radio frequencies journal March 2017
New giant radio sources and underluminous radio halos in two galaxy clusters journal January 2018
Faceting for direction-dependent spectral deconvolution journal March 2018
Universal thermodynamic properties of the intracluster medium over two decades in radius in the X-COP sample journal January 2019
The LOFAR Two-metre Sky Survey: II. First data release⋆⋆⋆ journal February 2019
The LOFAR Two-meter Sky Survey: Deep Fields Data Release 1: I. Direction-dependent calibration and imaging journal April 2021
LOFAR observations of galaxy clusters in HETDEX: Extraction and self-calibration of individual LOFAR targets journal July 2021
Radio and X-ray diffuse emission in six clusters of galaxies journal September 2001
Deep images of cluster radio halos journal March 2003
Double relics in Abell 2345 and Abell 1240: Spectral index and polarization analysis journal November 2008
The Distribution of Rich Clusters of Galaxies. journal March 1957
A compilation of redshifts and velocity dispersions for Abell clusters (epoch 1991.2) journal September 1991
The Northern ROSAT All‐Sky (NORAS) Galaxy Cluster Survey. I. X‐Ray Properties of Clusters Detected as Extended X‐Ray Sources journal August 2000
On the Origin of Radio Halos in Galaxy Clusters journal May 2001
A Textbook Example of a Bow Shock in the Merging Galaxy Cluster 1E 0657-56 journal February 2002
Chandra Temperature Profiles for a Sample of Nearby Relaxed Galaxy Clusters journal August 2005
Deep 1.4 GHz Very Large Array Observations of the Radio Halo and Relic in Abell 2256 journal June 2006
A Cosmology Calculator for the World Wide Web journal December 2006
XMM-NEWTON OBSERVATION OF THE NORTHWEST RADIO RELIC REGION IN A3667 journal May 2010
An Optical Catalog of Galaxy Clusters Obtained from an Adaptive Matched Filter Finder Applied to Sloan Digital sky Survey data Release 6 journal June 2011
Shock Heating of the Merging Galaxy Cluster a521 journal January 2013
Revisiting Scaling Relations for Giant Radio Halos in Galaxy Clusters journal October 2013
Wideband very Large Array Observations of A2256. i. Continuum, Rotation Measure, and Spectral Imaging journal September 2014
A Gmbcg Galaxy Cluster Catalog of 55,424 rich Clusters from sdss dr7 journal November 2010
AN ACCURATE FLUX DENSITY SCALE FROM 1 TO 50 GHz journal January 2013
On the Connection Between Giant Radio Halos and Cluster Mergers journal September 2010
Probing the Off-State of Cluster Giant Radio Halos journal September 2011
wsclean: an implementation of a fast, generic wide-field imager for radio astronomy journal August 2014
Radio interferometric gain calibration as a complex optimization problem journal April 2015
redMaPPer – III. A detailed comparison of the Planck 2013 and SDSS DR8 redMaPPer cluster catalogues journal April 2015
LOFAR 150-MHz observations of the Boötes field: catalogue and source counts journal May 2016
A $\mathcal {M}\gtrsim 3$ shock in ‘El Gordo’ cluster and the origin of the radio relic journal August 2016
Measuring the dynamical state of Planck SZ-selected clusters: X-ray peak – BCG offset journal February 2016
LOFAR discovery of a double radio halo system in Abell 1758 and radio/X-ray study of the cluster pair journal May 2018
The Three Hundred project: a large catalogue of theoretically modelled galaxy clusters for cosmological and astrophysical applications journal August 2018
Systematic X-Ray Analysis of Radio Relic Clusters with Suzaku journal February 2013
Second-order Fermi Reacceleration Mechanisms and Large-Scale Synchrotron Radio Emission in Intracluster Bridges journal February 2020
LoCuSS: the connection between brightest cluster galaxy activity, gas cooling and dynamical disturbance of X-ray cluster cores journal October 2009
Particle Acceleration on Megaparsec Scales in a Merging Galaxy Cluster journal September 2010
A radio ridge connecting two galaxy clusters in a filament of the cosmic web journal June 2019
Cosmic rays in Galaxy Clusters and Their Nonthermal Emission journal March 2014
Lofar Facet Calibration journal March 2016
The Extended Northern ROSAT Galaxy Cluster Survey (NORAS II). I. Survey Construction and First Results journal April 2017
Merging Cluster Collaboration: A Panchromatic Atlas of Radio Relic Mergers journal September 2019
The Fifteenth Data Release of the Sloan Digital Sky Surveys: First Release of MaNGA-derived Quantities, Data Visualization Tools, and Stellar Library journal January 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Abell 1430
clusters
galaxies
general radio continuum
interferometric techniques
non-thermal radiation mechanisms
thermal radiation mechanisms