Some results on the radio‐SZ correlation for galaxy cluster radio halos

Basu, Kaustuv

doi:10.1002/asna.201211855

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…The SZ signal should be less affected by the cluster dynamical state and therefore is expected to be a better indicator of the clusterʼs mass. Basu (2012Basu ( , 2013 and Cassano et al (2013) showed that there is good agreement between the Y SZ -P scaling relation and the scaling relations based on X-ray data.…”

Section: A Newly Discovered Radio Halomentioning

confidence: 68%

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FRONTIER FIELDS CLUSTERS:CHANDRAAND JVLA VIEW OF THE PRE-MERGING CLUSTER MACS J0416.1-2403

Ogrean

Weeren

Jones

et al. 2015

ApJ

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Merging galaxy clusters leave long-lasting signatures on the baryonic and non-baryonic cluster constituents, including shock fronts, cold fronts, X-ray substructure, radio halos, and offsets between the dark matter (DM) and the gas components. Using observations from Chandra, the Jansky Very Large Array, the Giant Metrewave Radio Telescope, and the Hubble Space Telescope, we present a multiwavelength analysis of the merging Frontier Fields cluster MACS J0416.1-2403 (z = 0.396), which consists of NE and SW subclusters whose cores are separated on the sky by ∼250 kpc. We find that the NE subcluster has a compact core and hosts an X-ray cavity, yet it is not a cool core. Approximately 450 kpc south-southwest of the SW subcluster, we detect a density discontinuity that corresponds to a compression factor of ∼1.5. The discontinuity was most likely caused by the interaction of the SW subcluster with a less massive structure detected in the lensing maps SW of the subclusterʼs center. For both the NE and the SW subclusters, the DM and the gas components are well-aligned, suggesting that MACS J0416.1-2403 is a pre-merging system. The cluster also hosts a radio halo, which is unusual for a pre-merging system. The halo has a 1.4 GHz power of (1.3 ± 0.3) × 10 24 W Hz −1 , which is somewhat lower than expected based on the X-ray luminosity of the cluster if the spectrum of the halo is not ultra-steep. We suggest that we are either witnessing the birth of a radio halo, or have discovered a rare ultra-steep spectrum halo.

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Section: A Newly Discovered Radio Halomentioning

confidence: 68%

“…A correlation is also observed between the clusterʼs integrated Sunyaev-Zel'dovich (SZ) effect (i.e., the integrated Compton Y SZ parameter) and the radio halo power (e.g., Basu 2012Basu , 2013. Y SZ is proportional to the volume integral of the pressure.…”

Section: A Newly Discovered Radio Halomentioning

confidence: 94%

FRONTIER FIELDS CLUSTERS:CHANDRAAND JVLA VIEW OF THE PRE-MERGING CLUSTER MACS J0416.1-2403

Ogrean

Weeren

Jones

et al. 2015

ApJ

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“…Merging clusters that host radio halos follow the L X − P scaling relation, while for other relaxed clusters the upper limits on the radio power are well below the correlation (Brunetti et al 2007). The radio halo power also correlates with the integrated Sunyaev-Zel'dovich (SZ) effect signal (Basu 2012(Basu , 2013Cassano et al 2013) given by the Compton Y SZ parameter, which traces the integrated pressure along the line of sight. The SZ signal is expected to be a better indicator of cluster mass than the X-ray luminosity and should be less affected by the cluster dynamical state.…”

Section: Introductionmentioning

confidence: 99%

THE DISCOVERY OF A RADIO HALO IN PLCK G147.3–16.6 AT Z = 0.65

Weeren

Intema

Lal

et al. 2014

ApJ

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Recent X-ray and Sunyaev-Zel'dovich (SZ) observations have dramatically increased the number of known distant galaxy clusters. In some merging, low-redshift (z < 0.4) clusters, centrally-located, diffuse, extended radio emission (called radio halos) has been found. Using the Giant Metrewave Radio Telescope (GMRT), we report the detection of diffuse radio emission in the binary-merging cluster PLCK G147.3-16.6 located at z = 0.65. We classify the emission as a giant radio halo due to the large physical extent of about 0.9 Mpc and low-surface brightness. We measure an integrated flux density of 7.3 ± 1.1 mJy at 610 MHz for the radio halo, resulting in a 1.4 GHz radio power of 5.1 × 10 24 W Hz −1 . The radio halo power is consistent with that expected from the known correlation between X-ray luminosity or the cluster integrated SZ signal and radio power. Our observations also suggest that more of these distant radio halos could be discovered with the GMRT.

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“…Further discussion of SZE results included the contributions by Sereno et al (2013) including lensing observations and Flores-Cacho (2013) focusing on high-z cluster detections by Planck. Kale (2013) and Basu (2013) discussed the relation of radio and SZE observations.…”

Section: The Structure Of Galaxy Clustersmentioning

confidence: 99%

X‐ray galaxy cluster studies for astro‐physics and cosmology

Böhringer

Schartel

2013

Astron Nachr

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The field of research on galaxy clusters has received an enormous increase in attention in the last years, since galaxy clusters have been more and more recognized as very important laboratories for astrophysical studies and observational probes for testing cosmological models. X-ray observations of these largest clearly defined objects in our Universe have been by far the most fruitful approach that has provided us with rich astrophysical and cosmological insights. ESA's XMM-Newton and NASA's Chandra observatories have been the powerhorses of this research. In this article we therefore like to summarize the major advances made in the field of galaxy cluster research primarily by these two instruments. We will touch the progress in understanding the structure of galaxy clusters and its statistics, the AGN feedback processes in the center of clusters, cosmic evolution of clusters, cluster mass measurements, the thermodynamic structure of the intracluster medium and its chemistry, X-ray surveys of clusters, and the use of galaxy clusters for cosmological tests.

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Some results on the radio‐SZ correlation for galaxy cluster radio halos

Cited by 5 publications

References 27 publications

FRONTIER FIELDS CLUSTERS:CHANDRAAND JVLA VIEW OF THE PRE-MERGING CLUSTER MACS J0416.1-2403

FRONTIER FIELDS CLUSTERS:CHANDRAAND JVLA VIEW OF THE PRE-MERGING CLUSTER MACS J0416.1-2403

THE DISCOVERY OF A RADIO HALO IN PLCK G147.3–16.6 AT Z = 0.65

X‐ray galaxy cluster studies for astro‐physics and cosmology

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