Role of intracluster supernovae in radio mini-haloes in galaxy clusters

Omar, Amitesh

doi:10.1093/mnrasl/slz020

Cited by 8 publications

(4 citation statements)

References 61 publications

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“…It should be noted that a similar hot patch has been reported for the ICM of the cool-core cluster RX J1347.5-1145 (Gitti & Schindler 2004). Here, we recall an alternative mechanism, according to which radio minihaloes represent aggregate radio output from Type Ia supernova remnant occurring in the stellar population distributed across the cluster core (Omar 2019). If true, this alternative mechanism would obviate the need for the turbulent re-acceleration of relativistic particles in order to create a radio mini-halo within the inner ICM.…”

Section: Radio Mini-halo In Formation?supporting

confidence: 58%

Deciphering the ultra-steep-spectrum diffuse radio sources discovered in the cool-core cluster Abell 980

Salunkhe

Paul

Gopal-Krishna

et al. 2022

A&A

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Clusters of galaxies are excellent laboratories for studying recurring nuclear activity in galactic nuclei since their hot gaseous medium can vastly prolong the detectability of their radio lobes via better confinement. We report here a multi-band study of the sparsely studied galaxy cluster Abell 980, based on our analysis of Chandra X-ray data and GMRT (150 and 325 MHz) and EVLA (1.5 GHz) radio archival data, revealing an unusually rich phenomenology. It is shown to be a quasi-relaxed cluster with a cool core (T ∼ 4.2 keV) surrounded by a hot and extensive intracluster medium (ICM) at T ∼ 6.8 keV. The radio emission shows a rich diversity, having (i) two large diffuse sources of ultra-steep spectrum (USS) extending to opposite extremities of the ICM, each associated with an X-ray brightness discontinuity (cold front); (ii) a bright radio-double of size ∼55 kpc coinciding with the central BCG; and (iii) a diffuse radio source, likely a mini-halo of size ∼110 kpc around the BCG which possesses a huge ellipsoidal stellar halo of extent ∼80 kpc. The association of cold fronts with two highly aged (∼260 Myr) USS sources in a cool-core cluster makes it a very rare system. These USS sources are probably radio lobes from a previous episode of jet activity in the BCG, driven buoyantly towards the outskirts of the X-ray halo, thereby creating the cold fronts. A deeper radio image of this cluster may provide a rare opportunity to verify the recently proposed alternative model which explains radio mini-haloes as the aggregate radio emission from Type Ia supernova remnant occurring in the giant stellar halo extended across the cluster core.

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Section: Radio Mini-halo In Formation?supporting

confidence: 58%

Deciphering the ultra-steep-spectrum diffuse radio sources discovered in the cool-core cluster Abell 980

Salunkhe

Paul

Gopal-Krishna

et al. 2022

A&A

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“…Alternatively, in the hadronic model, inelastic collisions between thermal and relativistic cosmic ray protons (CRp) may provide the continuous supply of relativistic electrons needed for large scale synchrotron emission (e.g., Pfrommer & Enßlin 2004;Fujita et al 2007;Keshet & Loeb 2010;Keshet 2010). Recently, another possible scenario was put forward by Omar (2019) where multiple supernovae type Ia (SNIa) events over the 100 Myr period can provide synchrotron emitting relativistic electrons on about 500 kpc scale.…”

Section: Introductionmentioning

confidence: 99%

Probing the Origin of Diffuse Radio Emission in the Cool Core of the Phoenix Galaxy Cluster

Raja

Rahaman

Datta

et al. 2020

ApJ

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Cool core galaxy clusters are considered to be dynamically relaxed clusters with regular morphology and highly X-ray luminous central region. However, cool core clusters can also be sites for merging events that exhibit cold fronts in X-ray and mini-halos in radio. We present recent radio/X-ray observations of the Phoenix Cluster or SPT-CL J2344-4243 at the redshift of z = 0.596. Using archival Chandra X-ray observations, we detect spiraling cool gas around the cluster core as well as discover two cold fronts near the core. It is perhaps the most distant galaxy cluster to date known to host cold fronts. Also, we present JVLA a) 1.52 GHz observations of the minihalo, previously discovered at 610 MHz with GMRT b) observations in the center of the Phoenix galaxy cluster. The minihalo flux density at 1.52 GHz is 9.65 ± 0.97 mJy with the spectral index between 610 MHz and 1.52 GHz being −0.98 ± 0.16 c) . A possible origin of these radio sources is turbulence induced by sloshing of the gas in the cluster core.

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“…This gradient is possibly due to a combination of effects, including ram-pressure stripping of galaxy flybys near the center of clusters, winds from the BCG, uplifting gas by AGN produced bubbles (e.g. Nulsen et al 2002;Simionescu et al 2009;Kirkpatrick & McNamara 2015) or even intracluster type Ia supernovae (Omar 2019). As mentioned previously, if the Fe gradient is coupled to an abundance ratio gradient, we can use it to improve the discriminating power of our technique.…”

Section: Abundance Distributionsmentioning

confidence: 97%

Ranking Theoretical Supernovae Explosion Models from Observations of the Intracluster Gas

Batalha,

Dupke,

Jiménez-Teja

2022

Preprint

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The intracluster medium (ICM) is a reservoir of heavy elements synthesized by different supernovae (SNe) types over cosmic history. Different enrichment mechanisms contribute a different relative metal production, predominantly caused by different SNe Type dominance. Using spatially resolved X-ray spectroscopy, one can probe the contribution of each metal enrichment mechanism. However, a large variety of physically feasible supernova explosion models make the analysis of the ICM enrichment history more uncertain. This paper presents a non-parametric PDF analysis to rank different theoretical SNe yields models by comparing their performance against observations. Specifically, we apply this new methodology to rank 7192 combinations of core-collapse SN and Type Ia SN models using 8 abundance ratios from Suzaku observations of 18 galaxy systems (clusters and groups) to test their predictions. This novel technique can compare many SN models and maximize spectral information extraction, considering all the individual measurable abundance ratios and their uncertainties. We find that Type II Supernova with nonzero initial metallicity progenitors in general performed better than Pair-Instability SN and Hypernova models and that 3D SNIa models (with the WD progenitor central density of 2.9 × 10 9 g cm −3 ) performed best among all tested SN model pairs.

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Role of intracluster supernovae in radio mini-haloes in galaxy clusters

Cited by 8 publications

References 61 publications

Deciphering the ultra-steep-spectrum diffuse radio sources discovered in the cool-core cluster Abell 980

Deciphering the ultra-steep-spectrum diffuse radio sources discovered in the cool-core cluster Abell 980

Probing the Origin of Diffuse Radio Emission in the Cool Core of the Phoenix Galaxy Cluster

Ranking Theoretical Supernovae Explosion Models from Observations of the Intracluster Gas

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