A M ≳ 3 shock in 'El Gordo' cluster and the origin of the radio relic

被引：66

作者：

Botteon, A. ^{[1
,2
]}

Gastaldello, F. ^{[3
]}

Brunetti, G. ^{[2
]}

Kale, R. ^{[4
]}

机构：

[1] Univ Bologna, Dipartimento Fis & Astron, Via C Ranzani 1, I-40127 Bologna, Italy

[2] INAF IRA, Via P Gobetti 101, I-40129 Bologna, Italy

[3] INAF IASF Milano, Via E Bassini 15, I-20133 Milan, Italy

[4] Tata Inst Fundamental Res, Natl Ctr Radio Astrophys, Pune 411007, Maharashtra, India

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 463卷 / 02期

关键词：

radiation mechanisms: non-thermal; shock waves; galaxies: clusters: individual: ACT-CL J0102-4915; radio continuum: general; X-rays: galaxies: clusters; NONTHERMAL ELECTRON ACCELERATION; X-RAY EXCESS; COMA CLUSTER; MERGING CLUSTER; PARTICLE-ACCELERATION; GALAXY CLUSTERS; EMISSION; FRONTS; EFFICIENCY; RADIATION;

D O I：

10.1093/mnras/stw2089

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an X-ray and radio study of the famous 'El Gordo', a massive and distant (z = 0.87) galaxy cluster. In the deep (340 ks) Chandra observation, the cluster appears with an elongated and cometary morphology, a sign of its current merging state. The GMRT radio observations at 610 MHz confirm the presence of a radio halo, which remarkably overlaps the X-ray cluster emission and connects a couple of radio relics. We detect a strong shock (M greater than or similar to 3) in the NW periphery of the cluster, co-spatially located with the radio relic. This is the most distant (z = 0.87) and one of the strongest shocks detected in a galaxy cluster. This work supports the relic shock connection and allows us to investigate the origin of these radio sources in an uncommon regime of M greater than or similar to 3. For this particular case we found that shock acceleration from the thermal pool is still a viable possibility.

引用

页码：1534 / 1542

页数：9

共 59 条

[1] Planck 2013 results. XXIX. The Planck catalogue of Sunyaev-Zeldovich sources [J].

Ade, P. A. R. ;

Aghanim, N. ;

Armitage-Caplan, C. ;

Arnaud, M. ;

Ashdown, M. ;

Atrio-Barandela, F. ;

Aumont, J. ;

Aussel, H. ;

Baccigalupi, C. ;

Banday, A. J. ;

Barreiro, R. B. ;

Barrena, R. ;

Bartelinann, M. ;

Bartlett, J. G. ;

Battaner, E. ;

Benabed, K. ;

Benoit, A. ;

Benoit-Levy, A. ;

Bernard, J. . ;

Bersanelli, M. ;

Bielewicz, P. ;

Bikmaev, I. ;

Bobin, J. ;

Bock, J. J. ;

Boehringer, H. ;

Bonaldi, A. ;

Bond, J. R. ;

Borrill, J. ;

Bouchet, F. R. ;

Bridges, M. ;

Bucher, M. ;

Burenin, R. ;

Burigana, C. ;

Butier, R. C. ;

Cardoso, J. -F. ;

Carvalho, P. ;

Catalano, A. ;

Challinor, A. ;

Chamballu, A. ;

Chary, R. -R. ;

Chen, X. ;

Chiang, H. C. ;

Chiang, L. -Y. ;

Chon, G. ;

Christensen, P. R. ;

Churazov, E. ;

Church, S. ;

Clements, D. L. ;

Colombi, S. ;

Colombo, L. P. L. .

ASTRONOMY & ASTROPHYSICS, 2014, 571

[2] Systematic X-Ray Analysis of Radio Relic Clusters with Suzaku [J].

Akamatsu, Hiroki ;

Kawahara, Hajime .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2013, 65 (01)

[3] ABUNDANCES OF THE ELEMENTS - METEORITIC AND SOLAR [J].

ANDERS, E ;

GREVESSE, N .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1989, 53 (01) :197-214

[4] Chandra ACIS-I particle background: an analytical model [J].

Bartalucci, I. ;

Mazzotta, P. ;

Bourdin, H. ;

Vikhlinin, A. .

ASTRONOMY & ASTROPHYSICS, 2014, 566

[5] PARTICLE-ACCELERATION AT ASTROPHYSICAL SHOCKS - A THEORY OF COSMIC-RAY ORIGIN [J].

BLANDFORD, R ;

EICHLER, D .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 1987, 154 (01) :1-75

[6] BREMSSTRAHLUNG, SYNCHROTRON RADIATION, AND COMPTON SCATTERING OF HIGH-ENERGY ELECTRONS TRAVERSING DILUTE GASES [J].

BLUMENTHAL, GR ;

GOULD, RJ .

REVIEWS OF MODERN PHYSICS, 1970, 42 (02) :237-+

[7] Double relics in Abell 2345 and Abell 1240 Spectral index and polarization analysis [J].

Bonafede, A. ;

Giovannini, G. ;

Feretti, L. ;

Govoni, F. ;

Murgia, M. .

ASTRONOMY & ASTROPHYSICS, 2009, 494 (02) :429-442

[8] A shock at the radio relic position in Abell 115 [J].

Botteon, A. ;

Gastaldello, F. ;

Brunetti, G. ;

Dallacasa, D. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2016, 460 (01) :L84-L88

[9] SHOCK HEATING OF THE MERGING GALAXY CLUSTER A521 [J].

Bourdin, H. ;

Mazzotta, P. ;

Markevitch, M. ;

Giacintucci, S. ;

Brunetti, G. .

ASTROPHYSICAL JOURNAL, 2013, 764 (01)

[10] Magnetic Fields, Relativistic Particles, and Shock Waves in Cluster Outskirts [J].

Brueggen, Marcus ;

Bykov, Andrei ;

Ryu, Dongsu ;

Roettgering, Huub .

SPACE SCIENCE REVIEWS, 2012, 166 (1-4) :187-213

← 1 2 3 4 5 6 →