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A Multi-Frequency View of the Radio Phoenix in the Abell 85 Cluster
High Energy Astrophysical Phenomena · Submitted 25 Sep 2023
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The observed features in the radio phoenix in the Abell 85 cluster seem to be in support of the adiabatic shock compression mechanism.
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The abstract, sentence by sentence
Radio phoenices are complex and filamentary diffuse radio sources found in both merging and relaxed clusters. The formation of these sources was proposed to be due to adiabatic compression of old Active Galactic Nucleus (AGN) plasma in shock waves. Most of the previous spectral studies of these sources were limited to integrated spectral indices, which were found to be very steep as well as showing a curved spectrum. Here, we have performed a multi-frequency investigation of the radio phoenix in the Abell 85 cluster. Owing to the sensitive high-resolution observations, we found some of the finer filamentary structures that were previously undetected. We produced resolved spectral index maps of the radio phoenix between 323, 700, and 1280 MHz. The orientation of the filaments, as well as the gradient across the spectral index maps, suggest the possible direction of the shock motion from northeast to southwest. The integrated spectrum of the radio phoenix was found to be very steep and curved toward high-frequencies. Furthermore, the spectral index of the filaments was found to be less steep compared to the non-filamentary regions, implying greater energy injection in the filaments. The observed features in the radio phoenix in the Abell 85 cluster seem to be in support of the adiabatic shock compression mechanism.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Radio phoenices are complex and filamentary diffuse radio sources found in both merging and relaxed clusters. | background 1.00 | 0.06 | 0.02 | asserted 1.00 |
| s1 | The formation of these sources was proposed to be due to adiabatic compression of old Active Galactic Nucleus (AGN) plasma in shock waves. | background 1.00 | 0.04 | 0.05 | hedged possibility 0.54 |
| s2 | Most of the previous spectral studies of these sources were limited to integrated spectral indices, which were found to be very steep as well as showing a curved spectrum. | gap 0.71 | 0.04 | 0.02 | asserted 1.00 |
| s3 | Here, we have performed a multi-frequency investigation of the radio phoenix in the Abell 85 cluster. | contribution 0.99 | 0.96 | 0.02 | asserted 0.96 |
| s4 | Owing to the sensitive high-resolution observations, we found some of the finer filamentary structures that were previously undetected. | result 0.96 | 0.97 | 0.03 | asserted 1.00 |
| s5 | We produced resolved spectral index maps of the radio phoenix between 323, 700, and 1280 MHz. | contribution 0.42 | 0.98 | 0.04 | asserted 1.00 |
| s6 | The orientation of the filaments, as well as the gradient across the spectral index maps, suggest the possible direction of the shock motion from northeast to southwest. | interpretation 0.95 | 0.90 | 0.11 | hedged possibility 1.00 |
| s7 | The integrated spectrum of the radio phoenix was found to be very steep and curved toward high-frequencies. | result 1.00 | 0.94 | 0.08 | asserted 1.00 |
| s8 | Furthermore, the spectral index of the filaments was found to be less steep compared to the non-filamentary regions, implying greater energy injection in the filaments. | result 0.66 | 0.96 | 0.11 | asserted 0.91 |
| s9 | The observed features in the radio phoenix in the Abell 85 cluster seem to be in support of the adiabatic shock compression mechanism. | interpretation 1.00 | 0.58 | 0.89 | hedged possibility 0.98 |
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Original abstract
Radio phoenices are complex and filamentary diffuse radio sources found in both merging and relaxed clusters. The formation of these sources was proposed to be due to adiabatic compression of old Active Galactic Nucleus (AGN) plasma in shock waves. Most of the previous spectral studies of these sources were limited to integrated spectral indices, which were found to be very steep as well as showing a curved spectrum. Here, we have performed a multi-frequency investigation of the radio phoenix in the Abell 85 cluster. Owing to the sensitive high-resolution observations, we found some of the finer filamentary structures that were previously undetected. We produced resolved spectral index maps of the radio phoenix between 323, 700, and 1280 MHz. The orientation of the filaments, as well as the gradient across the spectral index maps, suggest the possible direction of the shock motion from northeast to southwest. The integrated spectrum of the radio phoenix was found to be very steep and curved toward high-frequencies. Furthermore, the spectral index of the filaments was found to be less steep compared to the non-filamentary regions, implying greater energy injection in the filaments. The observed features in the radio phoenix in the Abell 85 cluster seem to be in support of the adiabatic shock compression mechanism.
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References
How the literature uses it
5 arXiv papers cite this in 9 sentences
Papers citing it · 7 sentences without a confident label
Compares with it 1 paper
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Indeed, the shows some morphological similarities with the already cited archetypal radio phoenix in Abell 85 [ref] .
The Treble Clef radio phoenix and its old nonthermal filaments · Introduction · 0.97
Cites it as background 1 paper
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Radio phoenixes are usually highly filamentary, mildly polarized, and associated with fossil relativistic plasma from an active galactic nucleus (AGN) outburst [ref] .
Relativistic ions with power-law spectra explain radio phoenixes · Introduction · 0.95
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