Journal ArticleDOI
Detection of Bulk Motions in the Intracluster Medium of the Centaurus Cluster
Renato A. Dupke,Joel N. Bregman +1 more
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In this article, the authors used two ASCA observations of the Centaurus cluster (Abell 3526) to produce a velocity map for the gas in the cluster's central regions and found a significant (>99.8% confidence level) velocity gradient along a line near-perpendicular to the direction of the incoming subgroup.Abstract:
Several recent numerical simulations of off-center cluster mergers predict that significant angular momentum with associated velocities of a few ?103 km?s-1 can be imparted to the resulting cluster. Such gas bulk velocities can be detected by the Doppler shift of X-ray spectral lines with ASCA spectrometers. Using two ASCA observations of the Centaurus cluster (Abell 3526), we produced a velocity map for the gas in the cluster's central regions. We also detected radial and azimuthal gradients in temperature and metal abundance distributions, which seem to be associated with the infalling subgroup centered at NGC 4709 (Cen 45). More importantly, we found a significant (>99.8% confidence level) velocity gradient along a line near-perpendicular to the direction of the incoming subgroup and with a maximum velocity difference of ~3.4 ? 1.1 ? 103 km s-1. It is unlikely (P < 0.002) that the observed velocity gradient is generated by gain fluctuations across the detectors. While the observed azimuthal temperature and abundance variations can be attributed to the interaction with Cen 45, we argue that the intracluster gas velocity gradient is more likely due to a previous off-center merging event in the main body of the Centaurus cluster.read more
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Journal ArticleDOI
VLA H I Observations of Gas Stripping in the Virgo Cluster Spiral NGC 4522
TL;DR: In this paper, the authors present VLA H I observations at ~20'' 1.5 kpc resolution of the highly inclined, H I-deficient Virgo Cluster spiral galaxy NGC 4522, which is one of the clearest and nearest cases of ongoing ICM-ISM stripping.
Journal ArticleDOI
Creation of cosmic structure in the complex galaxy cluster merger Abell 2744
Julian Merten,Dan Coe,R. A. Dupke,Richard Massey,Adi Zitrin,Eduardo S. Cypriano,Nobuhiro Okabe,Brenda Frye,F. G. Braglia,Yolanda Jiménez-Teja,Narciso Benítez,Tom Broadhurst,Tom Broadhurst,Jason Rhodes,Massimo Meneghetti,Leonidas A. Moustakas,Laerte Sodré,Jessica Krick,J. N. Bregman +18 more
TL;DR: In this paper, a detailed strong lensing, weak lensing and X-ray analysis of Abell 2744 (z = 0:308), one of the most actively merging galaxy clusters known, is presented.
Journal ArticleDOI
Dense Cloud Ablation and Ram Pressure Stripping of the Virgo Spiral NGC 4402
TL;DR: In this paper, optical, H I and radio continuum observations of the highly inclined Virgo Cluster Sc galaxy NGC-4402 were presented, which show evidence for ram pressure stripping and dense cloud ablation.
Journal ArticleDOI
Outskirts of Galaxy Clusters
Thomas H. Reiprich,Kaustuv Basu,Stefano Ettori,Holger Israel,Lorenzo Lovisari,Silvano Molendi,Etienne Pointecouteau,Mauro Roncarelli +7 more
TL;DR: In this paper, the authors summarize and illustrate the relevant underlying physical and chemical processes and review the recent progress in X-ray, Sunyaev-Zeldovich, and weak gravitational lensing observations of cluster outskirts, including also brief discussions of technical challenges and possible future improvements.
Journal ArticleDOI
A deep Chandra observation of the Centaurus cluster: bubbles, filaments and edges
Andrew C. Fabian,Jeremy S. Sanders,G. B. Taylor,G. B. Taylor,Steven W. Allen,Steven W. Allen +5 more
TL;DR: In this article, Chandra images and gas temperatures taken from a deep 200 ks Chandra observation of the Centaurus cluster are presented, together with wispy filaments of soft X-ray emitting gas.
References
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