Low-frequency radio emission in the massive galaxy cluster MACS J0717.5+3745
M. Pandey-Pommier,Johan Richard,Francoise Combes,K. S. Dwarakanath,B. Guiderdoni,Chiara Ferrari,S. K. Sirothia,D. Narasimha +7 more
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In this paper, the authors analyzed multiple low-frequency radio data for the X-ray luminous massive galaxy cluster MACS J0717.5 + 3745, located at z = 0.5548.Abstract:
To investigate the nonthermal emission mechanism and their interaction during cluster mergers, we analyze multiple low-frequency radio data for the X-ray luminous massive galaxy cluster MACS J0717.5 + 3745, located at z = 0.5548. Large-scale structure-formation models in the Universe suggest that galaxy clusters grow via constant accretion of gas and the merger of galaxy groups and smaller clusters. Low-frequency radio observations trace these mergers in the form of relics and halos. The dual frequency observations were performed on MACS J0717.5 + 3745 to investigate the spectral index pattern of the nonthermal emission and its interaction within the intracluster medium (ICM), during merger process. Methods: Continuum observations were carried out using GMRT at 0.235 and 0.61 GHz on MACS J0717.5 + 3745 and archival data from the VLA (0.074 and 1.42 GHz) and WSRT (0.325 GHz) was used to complement the results. Furthermore, to explore the thermal and nonthermal interactions within the ICM and the morphological distribution, Chandra X-ray and HST data were used. Results: A highly complex nonthermal radio emission distribution is seen in the cluster at very low frequencies, with a global spectral index α0.2350.61˜-1.17±0.37. We have detected a giant radio halo within the cluster system with a linear size of 1.58 Mpc and a "Chair-shaped" filament structure between the merging subclusters of linear size 853 kpc at 0.235 GHz. This is the most powerful halo ever observed with P1.4 = 9.88 × 1025 WHz-1 and an equipartition magnetic field estimate of ~6.49 μG. The bright filament structure is well located in the central merging region of subclusters with enhanced temperature, as shown by Chandra and HST data analysis, further indicating the formation of this structure due to shock waves encountered within the ICM during the merger events.read more
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Journal ArticleDOI
Diffuse Radio Emission from Galaxy Clusters
R. J. van Weeren,F. de Gasperin,Hiroki Akamatsu,Marcus Brüggen,L. Feretti,Hyesung Kang,Andra Stroe,Andra Stroe,Fabio Zandanel +8 more
TL;DR: In a growing number of galaxy clusters diffuse extended radio sources have been found. as mentioned in this paper classified diffuse cluster radio sources into radio halos, cluster radio shocks (relics), and revived AGN fossil plasma sources.
The VLA Low Frequency Sky Survey
A. S. Cohen,W. M. Lane,Namir E. Kassim,T. J. W. Lazio,W. D. Cotton,James J. Condon,Richard A. Perley,W. C. Erickson +7 more
TL;DR: The VLA Low-frequency Sky Survey (VLSS) as discussed by the authors has been used to image 95% of the 3π sr of sky north of δ = -30° at a frequency of 74 MHz (4 m wavelength).
Journal ArticleDOI
Diffuse Radio Emission from Galaxy Clusters
R. J. van Weeren,F. de Gasperin,Hiroki Akamatsu,Marcus Brüggen,L. Feretti,Hyesung Kang,Andra Stroe,Andra Stroe,Fabio Zandanel +8 more
TL;DR: In a growing number of galaxy clusters diffuse extended radio sources have been found. as discussed by the authors classified diffuse cluster radio sources into radio halos, cluster radio shocks (relics), and revived AGN fossil plasma sources.
Journal ArticleDOI
Strong-lensing analysis of MACS J0717.5+3745 from Hubble Frontier Fields observations: How well can the mass distribution be constrained?
Marceau Limousin,Johan Richard,Eric Jullo,Mathilde Jauzac,Mathilde Jauzac,Harald Ebeling,M. Bonamigo,Anahita Alavi,Benjamin Clément,Carlo Giocoli,Jean-Paul Kneib,Jean-Paul Kneib,Tomás Verdugo,Tomás Verdugo,Priya Natarajan,Brian Siana,Hakim Atek,Hakim Atek,M. Rexroth +18 more
TL;DR: In this article, a strong-lensing analysis of MACSJ0717.5+3745 is presented, based on the full depth of the Hubble Frontier Field (HFF) observations, which brings the number of multiply imaged systems to 61, ten of which have been confirmed.
Journal ArticleDOI
Mapping the kinetic Sunyaev-Zel'dovich effect toward MACS J0717.5+3745 with NIKA
R. Adam,R. Adam,I. Bartalucci,G. W. Pratt,Peter A. R. Ade,Ph. André,Monique Arnaud,Alexandre Beelen,Alain Benoit,Aurelien Bideaud,N. Billot,Hervé Bourdin,O. Bourrion,Martino Calvo,A. Catalano,Gregoire Coiffard,Barbara Comis,A. D'Addabbo,A. D'Addabbo,M. De Petris,J. Démoclès,F.-X. Désert,Simon Doyle,Eiichi Egami,Chiara Ferrari,Johannes Goupy,Carsten Kramer,Guilaine Lagache,Samuel Leclercq,J. F. Macías-Pérez,Sophie Maurogordato,Philip Daniel Mauskopf,Philip Daniel Mauskopf,F. Mayet,Alessandro Monfardini,Tony Mroczkowski,F. Pajot,Enzo Pascale,L. Perotto,Giampaolo Pisano,Etienne Pointecouteau,Etienne Pointecouteau,Nicolas Ponthieu,V. Revéret,A. Ritacco,L. Rodriguez,Charles Romero,Florian Ruppin,K. F. Schuster,A. Sievers,Sébastien Triqueneaux,Carole Tucker,Michael Zemcov,Michael Zemcov,R. Zylka +54 more
TL;DR: In this paper, the authors reported resolved observations at 150 and 260 GHz of the SZ effect toward the triple merger MACS J0717.5+3745 (z=0.55), using data obtained with the NIKA camera at the IRAM 30m telescope.
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