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 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

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 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.

scholarly journals A joint XMM-NuSTAR observation of the galaxy cluster Abell 523: Constraints on inverse Compton emission

2019 ◽  
Vol 628 ◽  
pp. A83 ◽  
Author(s):  
F. Cova ◽  
F. Gastaldello ◽  
D. R. Wik ◽  
W. Boschin ◽  
A. Botteon ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Galaxy Cluster ◽  
X Ray ◽  
Radio Halo ◽  
Upper Limit ◽  
Inverse Compton ◽  
The Galaxy ◽  
The Magnetic Field

Aims. We present the results of a joint XMM-Newton and NuSTAR observation (200 ks) of the galaxy cluster Abell 523 at z = 0.104. The peculiar morphology of the cluster radio halo and its outlier position in the radio power P(1.4 GHz) – X-ray luminosity plane make it an ideal candidate for the study of radio and X-ray correlations and for the search of inverse Compton (IC) emission. Methods. We constructed bi-dimensional maps for the main thermodynamic quantities (i.e., temperature, pressure and entropy) derived from the XMM observations to describe the physical and dynamical state of the cluster’s intracluster medium (ICM) in detail. We performed a point-to-point comparison in terms of surface brightness between the X-ray and radio emissions to quantify their morphological discrepancies. Making use of NuSTAR’s unprecedented hard X-ray focusing capability, we looked for IC emission both globally and locally after properly modeling the purely thermal component with a multi-temperature description. Results. The thermodynamic maps obtained from the XMM observation suggest the presence of a secondary merging process that could be responsible for the peculiar radio halo morphology. This hypothesis is supported by the comparison between the X-ray and radio surface brightnesses, which shows a broad intrinsic scatter and a series of outliers from the best-fit relation, corresponding to those regions that could be influenced by a secondary merger. The global NuSTAR spectrum can be explained by purely thermal gas emission, and there is no convincing evidence that an IC component is needed. The 3σ upper limit on the IC flux in the 20−80 keV band is in the [2.2−4.0] × 10−13 erg s−1 cm−2 range, implying a lower limit on the magnetic field strength in the B >  [0.23 − 0.31] μG range. Locally, we looked for IC emission in the central region of the cluster radio halo finding a 3σ upper limit on the 20−80 keV nonthermal flux of 3.17 × 10−14 erg s−1 cm−2, corresponding to a lower limit on the magnetic field strength of B ≳ 0.81 μG.

Sign in / Sign up

Export Citation Format

Share Document