Diffuse radio emission from galaxy clusters in the LOFAR Two-metre Sky Survey Deep Fields

被引：22

作者：

Osinga, E. ^{[1
]}

van Weeren, R. J. ^{[1
]}

Boxelaar, J. M. ^{[1
]}

Brunetti, G. ^{[2
]}

Botteon, A. ^{[1
]}

Brueggen, M. ^{[3
]}

Shimwell, T. W. ^{[1
,4
]}

Bonafede, A. ^{[2
,5
]}

Best, P. N. ^{[6
]}

Bonato, M. ^{[2
,7
,8
]}

Cassano, R. ^{[2
]}

Gastaldello, F. ^{[9
]}

di Gennaro, G. ^{[1
]}

Hardcastle, M. J. ^{[10
]}

Mandal, S. ^{[1
]}

Rossetti, M. ^{[9
]}

Roettgering, H. J. A. ^{[1
]}

Sabater, J. ^{[6
]}

Tasse, C. ^{[11
,12
]}

机构：

[1] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[2] Ist Radioastron, Ist Nazl Astrofis, Via P Gobetti 101, I-40129 Bologna, Italy

[3] Univ Hamburg, Hamburg Observ, Gojenbergsweg 112, D-21029 Hamburg, Germany

[4] Netherlands Inst Radio Astron, ASTRON, Postbus 2, NL-7990 AA Dwingeloo, Netherlands

[5] Univ Bologna, DIFA, Via Gobetti 93-2, I-40129 Bologna, Italy

[6] Inst Astron, Royal Observ, SUPA, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[7] Italian ALMA Reg Ctr, Via Gobetti 101, I-40129 Bologna, Italy

[8] INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

[9] INAF IASF Milano, Via A Corti 12, I-20133 Milan, Italy

[10] Univ Hertfordshire, Ctr Astrophys Res, Coll Lane, Hatfield AL10 9AB, Herts, England

[11] Univ Paris Diderot, Observ Paris, CNRS, GEPI, 5 Pl Jules Janssen, F-92190 Meudon, France

[12] Rhodes Univ, Dept Phys & Elect, POB 94, ZA-6140 Grahamstown, South Africa

来源：

ASTRONOMY & ASTROPHYSICS | 2021年 / 648卷

基金：

英国科学技术设施理事会; 爱尔兰科学基金会;

关键词：

galaxies: clusters: general; galaxies: clusters: intracluster medium; radiation mechanisms: non-thermal; radio continuum: general; DATA RELEASE; PARTICLE-ACCELERATION; GAMMA-RAY; SCALING RELATIONS; MAGNETIC-FIELDS; 610-MHZ SURVEY; COSMIC-RAYS; HALO SURVEY; FOLLOW-UP; TURBULENCE;

D O I：

10.1051/0004-6361/202039076

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

D Low-frequency radio observations are revealing an increasing number of diffuse synchrotron sources from galaxy clusters, primarily in the form of radio halos or radio relics. The existence of this diffuse synchrotron emission indicates the presence of relativistic particles and magnetic fields. It is still an open question as to exactly what mechanisms are responsible for the population of relativistic electrons driving this synchrotron emission. The LOFAR Two-metre Sky Survey Deep Fields offer a unique view of this problem. Reaching noise levels below 30 Jy beam 1, these are the deepest images made at the low frequency of 144 MHz. This paper presents a search for diffuse emission in galaxy clusters in the first data release of the LOFAR Deep Fields. We detect a new high-redshift radio halo with a flux density of 8 :9 X 1 :0 mJy and corresponding luminosity of P144MHz = (3 :6 X 0 :6) X 1025 W Hz 1 in an X-ray detected cluster at z = 0 :77 with a mass estimate of M500 = 3 :3+1:1 1:7 X 1014Mfi: Deep upper limits are placed on clusters with non-detections. We compare the results to the correlation between halo luminosity and cluster mass derived for radio halos found in the literature. This study is one of a few to find diffuse emission in low mass (M500 < 5 X 1014M fi) systems and shows that deep low-frequency observations of galaxy clusters are fundamental for opening up a new part of parameter space in the study of non-thermal phenomena in galaxy clusters.

引用

页数：18

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