A STRONG MERGER SHOCK IN ABELL 665

被引：35

作者：

Dasadia, S. ^{[1
]}

Sun, M. ^{[1
]}

Sarazin, C. ^{[2
]}

Morandi, A. ^{[1
]}

Markevitch, M. ^{[3
]}

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

Feretti, L. ^{[5
]}

Giovannini, G. ^{[6
]}

Govoni, F. ^{[7
]}

Vacca, V. ^{[7
]}

机构：

[1] Univ Alabama, Dept Phys, Huntsville, AL 35816 USA

[2] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA

[3] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA

[4] Johns Hopkins Univ, Homewood Campus, Baltimore, MD 21218 USA

[5] INAF ORA Bologna, Via Gobetti 101, I-40129 Bologna, Italy

[6] Dipartimento Astron, Via Ranzani 1, I-40127 Bologna, Italy

[7] INAF ORA Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2016年 / 820卷 / 01期

基金：

美国国家航空航天局;

关键词：

galaxies: clusters: general; galaxies: clusters: individual (Abell 665); radio continuum: general; shock waves; X-rays: galaxies: clusters; GALAXY CLUSTERS; X-RAY; RADIO HALOS; BOW SHOCK; INTRACLUSTER MEDIUM; MERGING CLUSTERS; BULLET CLUSTER; COLD FRONTS; CHANDRA; SAMPLE;

D O I：

10.3847/2041-8205/820/1/L20

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Deep (103 ks) Chandra observations of Abell 665 have revealed rich structures in this merging galaxy cluster, including a strong shock and two cold fronts. The newly discovered shock has a Mach number of M = 3.0 +/- 0.6, propagating in front of a cold disrupted cloud. This makes Abell 665 the second cluster, after the Bullet cluster, where a strong merger shock of M approximate to 3 has been detected. The shock velocity from jump conditions is consistent with (2.7 +/- 0.7) x 10(3) km s(-1). The new data also reveal a prominent southern cold front with potentially heated gas ahead of it. Abell 665 also hosts a giant radio halo. There is a hint of diffuse radio emission extending to the shock at the north, which needs to be examined with better radio data. This new strong shock provides a great opportunity to study the re-acceleration model with the X-ray and radio data combined.

引用

页数：5

共 42 条

[1]

Abell G.O., 1958, Astrophysical J. Supplement., V3, P211

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