ATCA observations of the MACS-Planck Radio Halo Cluster Project I. New detection of a radio halo in PLCKG285.0-23.7

被引：17

作者：

Aviles, G. Martinez ^{[1
]}

Ferrari, C. ^{[1
]}

Johnston-Hollitt, M. ^{[2
]}

Pratley, L. ^{[2
]}

Macario, G. ^{[1
]}

Venturi, T. ^{[3
]}

Brunetti, G. ^{[3
]}

Cassano, R. ^{[3
]}

Dallacasa, D. ^{[3
,4
]}

Intema, H. T. ^{[5
]}

Giacintucci, S. ^{[6
]}

Hurier, G. ^{[7
]}

Aghanim, N. ^{[7
]}

Douspis, M. ^{[7
]}

Langer, M. ^{[7
]}

机构：

[1] Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bvd Observ,CS 34229, F-06304 Nice 4, France

[2] Victoria Univ Wellington, Sch Chem & Phys Sci, POB 600, Wellington 6140, New Zealand

[3] INAF Osservatorio Radioastron, Via P Gobetti 101, I-40129 Bologna, Italy

[4] UniBO, Dept Phys & Astron, Via Ranzani 1, I-40127 Bologna, Italy

[5] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 Leiden, Netherlands

[6] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[7] Univ Paris Saclay, Univ Paris Sud, CNRS, Inst Astrophys Spatiale, Bat 121, F-91405 Orsay, France

来源：

ASTRONOMY & ASTROPHYSICS | 2016年 / 595卷

关键词：

galaxies: clusters: general; galaxies: clusters: individual: PLCK G285.0-23.7; radio continuum: galaxies; galaxies: clusters: intracluster medium; radiation mechanisms: non-thermal; X-RAY LUMINOSITY; GALAXY CLUSTER; NONTHERMAL EMISSION; SUNYAEV-ZELDOVICH; SCALING RELATIONS; BULLET CLUSTER; COMA CLUSTER; FOLLOW-UP; DISCOVERY; RELICS;

D O I：

10.1051/0004-6361/201628788

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We investigate the possible presence of diffuse radio emission in the intermediate redshift, massive cluster PLCK G285.0-23.7 (z = 0.39, M-500 = 8.39 X 10(14) M-circle dot). Methods. Our 16 cm-band ATCA observations of PLCK G285.0-23.7 allow us to reach a rms noise level of similar to 11 mu Jy/beam on the wide-band (1.1-3.1 GHz), full-resolution (similar to 5 arcsec) image of the cluster, making it one of the deepest ATCA images yet published. We also re-image visibilities at lower resolution in order to achieve a better sensitivity to low-surface-brightness extended radio sources. Results. We detect one of the lowest luminosity radio halos known at z > 0.35, characterised by a slight off set from the well-studied 1.4 GHz radio power vs. cluster mass correlation. Similarly to most known radio-loud clusters (i.e. those hosting diffuse non-thermal sources), PLCK G285.0-23.7 has a disturbed dynamical state. Our analysis reveals a similarly elongated X-ray and radio morphology. While the size of the radio halo in PLCK G285.0-23.7 is smaller than lower redshift radio-loud clusters in the same mass range, it shows a similar correlation with the cluster virial radius, as expected in the framework of hierarchical structure formation.

引用

页数：11

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