scholarly journals Suzaku Observation of the Radio Halo Cluster Abell 2319: Gas Dynamics and Hard X-Ray Properties

2009 ◽  
Vol 61 (6) ◽  
pp. 1293-1303 ◽  
Author(s):  
Chika Sugawara ◽  
Motokazu Takizawa ◽  
Kazuhiro Nakazawa
Keyword(s):  
Gas Dynamics ◽  
X Ray ◽  
Radio Halo

Radio and X-ray observations of the radio halo source in A1367

1983 ◽  
Vol 270 ◽  
pp. 410 ◽  
Author(s):  
G. Gavazzi ◽  
G. Trinchieri
Keyword(s):  
X Ray ◽  
Radio Halo

scholarly journals ClG 0217+70: A massive merging galaxy cluster with a large radio halo and relics

2020 ◽  
Vol 642 ◽  
pp. L3
Author(s):  
X. Zhang ◽  
A. Simionescu ◽  
J. S. Kaastra ◽  
H. Akamatsu ◽  
D. N. Hoang ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Galaxy Cluster ◽  
Precise Determination ◽  
Optical Data ◽  
Scaling Relations ◽  
Thermal Pressure ◽  
X Ray ◽  
Radio Halo ◽  
Physical Scale

We present an analysis of archival Chandra data of the merging galaxy cluster ClG 0217+70. The Fe XXV Heα X-ray emission line is clearly visible in the 25 ks observation, allowing a precise determination of the redshift of the cluster as z = 0.180 ± 0.006. We measure kT500 = 8.3  ±  0.4 keV and estimate M500 = (1.06 ± 0.11) × 1015 M⊙ based on existing scaling relations. Correcting both the radio and X-ray luminosities with the revised redshift reported here, which is much larger than previously inferred based on sparse optical data, this object is no longer an X-ray underluminous outlier in the LX − Pradio scaling relation. The new redshift also means that, in terms of physical scale, ClG 0217+70 hosts one of the largest radio halos and one of the largest radio relics known to date. Most of the relic candidates lie in projection beyond r200. The X-ray morphological parameters suggest that the intracluster medium is still dynamically disturbed. Two X-ray surface brightness discontinuities are confirmed in the northern and southern parts of the cluster, with density jumps of 1.40 ± 0.16 and 3.0 ± 0.6, respectively. We also find a 700 × 200 kpc X-ray faint channel in the western part of the cluster, which may correspond to compressed heated gas or increased non-thermal pressure due to turbulence or magnetic fields.

scholarly journals A radio halo surrounding the Brightest Cluster Galaxy in RXCJ0232.2–4420: a mini-halo in transition?

2019 ◽  
Vol 486 (1) ◽  
pp. L80-L84 ◽  
Author(s):  
Ruta Kale ◽  
Krishna M Shende ◽  
Viral Parekh
Keyword(s):  
Radio Source ◽  
Surface Brightness ◽  
Galaxy Cluster ◽  
Cosmic Ray ◽  
Radio Sources ◽  
Cluster Galaxy ◽  
X Ray ◽  
Radio Halo ◽  
The Galaxy ◽  
Radio Power

ABSTRACT Diffuse radio sources associated with the intra-cluster medium are direct probes of the cosmic ray electrons and magnetic fields. We report the discovery of a diffuse radio source in the galaxy cluster RXCJ0232.2–4420 (SPT-CL J0232–4421, z = 0.2836) using 606 MHz observations with the Giant Metrewave Radio Telescope. The diffuse radio source surrounds the Brightest Cluster Galaxy in the cluster-like typical radio mini-haloes. However the total extent of it is 550 × 800 kpc2, which is larger than mini-haloes and similar to that of radio haloes. The BCG itself is also a radio source with a marginally resolved core at 7 arcsec (30 kpc) resolution. We measure the 606 MHz flux density of the RH to be 52 ± 5 mJy. Assuming a spectral index of 1.3, the 1.4 GHz radio power is 4.5 × 1024 W Hz−1. The dynamical state of the cluster has been inferred to be 'relaxed’ and also as 'complex’, depending on the classification methods based on the morphology of the X-ray surface brightness. This system thus seems to be in the transition phase from a mini-halo to a radio halo.

scholarly journals Colliding stellar winds: recent advances in modelling

1999 ◽  
Vol 193 ◽  
pp. 289-297
Author(s):  
Ian R. Stevens ◽  
Julian M. Pittard
Keyword(s):  
Line Profile ◽  
Gas Dynamics ◽  
Interaction Region ◽  
Stellar Winds ◽  
Radiation Hydrodynamics ◽  
3D Simulations ◽  
X Ray ◽  
Recent Advances

We report on recent advances in the modelling of colliding stellar winds in WR binaries. Here, we concentrate on the modelling of X-ray observations using numerical gas-dynamics, in some cases including radiation hydrodynamics, and look in detail at a few systems, such as γ2 Velorum, η Carinae and HD 193793. We also report briefly on the modelling of infrared line-profile variability in a number of close WR+O-star systems, which can reveal further information on the dynamics of the interaction region. We discuss recent 3D-simulations and describe the exciting prospects that AXAF and XMM open up.

scholarly journals An unlikely radio halo in the low X-ray luminosity galaxy cluster RXC J1514.9-1523

2011 ◽  
Vol 534 ◽  
pp. A57 ◽  
Author(s):  
S. Giacintucci ◽  
D. Dallacasa ◽  
T. Venturi ◽  
G. Brunetti ◽  
R. Cassano ◽  
...  
Keyword(s):  
Galaxy Cluster ◽  
X Ray ◽  
Radio Halo ◽  
Low X

High-resolution X-ray observations of M87 - Nucleus, jet and radio halo

1982 ◽  
Vol 261 ◽  
pp. 42 ◽  
Author(s):  
E. J. Schreier ◽  
P. Gorenstein ◽  
E. D. Feigelson
Keyword(s):  
High Resolution ◽  
X Ray ◽  
Radio Halo

scholarly journals X-Ray Substructures of BCS, NORAS, REFLEX, Radio Halos/Relics and Cooling Flow Clusters of Galaxies

2002 ◽  
Vol 12 ◽  
pp. 519-521 ◽  
Author(s):  
Peter Schuecker ◽  
Hans Böhringer ◽  
Luigina Feretti
Keyword(s):  
Systematic Study ◽  
Surface Brightness ◽  
Clusters Of Galaxies ◽  
X Ray ◽  
Radio Halo ◽  
Cooling Flow ◽  
Cluster Morphology ◽  
Density Relation ◽  
Radio Halos

AbstractThe results of a systematic study of substructures in X-ray surface brightness distributions of BCS, NORAS, REFLEX, radio halo, relic, and cooling flow clusters of galaxies based on RASS data are presented. At least 40 percent of the clusters show substructure. Indications for a cluster morphology-density relation are found. The fraction of clusters with substructure seems to be higher for halo and relic clusters and lower for clusters with cooling flow signature.

scholarly journals An X-ray and Radio Study of the Hubble Frontier Field Cluster Abell S1063

2021 ◽  
Author(s):  
Majidul Rahaman ◽  
Ramij Raja ◽  
Abhirup Datta ◽  
Jack O Burns ◽  
Brian Alden ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Large Scale ◽  
High Fidelity ◽  
Radio Flux ◽  
X Ray ◽  
Radio Halo ◽  
Average Temperature ◽  
North East ◽  
The North ◽  
Cluster Of Galaxies

Abstract We present results from Chandra X-ray observations and 325 MHz Giant Metrewave Radio Telescope (GMRT) observations of the massive and X-ray luminous cluster of galaxies Abell S1063. We report the detection of large-scale “excess brightness” in the residual Chandra X-ray surface brightness map, which extends at least 2.7 Mpc towards the north-east from the center of the cluster. We also present a high fidelity X-ray flux and temperature map using Chandra archival data of 122 ksec, which shows the disturbed morphology in the cluster. The residual flux map shows the first observational confirmation of the merging axis proposed in earlier simulations. The average temperature within R500 is 11.7 ± 0.56 keV, which makes AS1063 one of the hottest clusters in the nearby Universe. The integrated radio flux density at 325 MHz is found to be 62.0 ± 6.3 mJy. The integrated spectrum of the radio halo follows a power-law with a spectral index α = −1.43 ± 0.13. The radio halo is found to be significantly under-luminous, which favored for both the hadronic as well as the turbulent re-acceleration mechanism for its origin.

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