2015
DOI: 10.1093/pasj/psv082
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JVLA S- and X-band polarimetry of the merging cluster Abell 2256

Abstract: We report polarimetry results of a merging cluster of galaxies Abell 2256 with Karl G. Jansky Very Large Array (JVLA). We performed new observations with JVLA at S-band (2051-3947 MHz) and X-band (8051-9947 MHz) in the C array configuration, and detected significant polarized emissions from the radio relic, Source A, and Source B in this cluster. We calculated the total magnetic field strengths toward the radio relic using revised equipartition formula, which is 1.8-5.0 µG. With dispersions of Faraday rotation… Show more

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Cited by 22 publications
(26 citation statements)
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“…It is believed that CR electrons in radio relics are accelerated at shocks associated with cluster formation, which is consistent with the facts that shock structures are found in the ICM density and temperature distributions near the relics through X-ray observations (Finoguenov et al 2010;Akamatsu et al 2012;Akamatsu & Kawahara 2013) and that significant polarization degree is often observed in radio observations (van Weeren et al 2010;van Weeren et al 2012;Ozawa et al 2015). Diffusive shock acceleration (DSA) is the most promising particle acceleration process.…”
Section: Radio Relicsupporting
confidence: 55%
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“…It is believed that CR electrons in radio relics are accelerated at shocks associated with cluster formation, which is consistent with the facts that shock structures are found in the ICM density and temperature distributions near the relics through X-ray observations (Finoguenov et al 2010;Akamatsu et al 2012;Akamatsu & Kawahara 2013) and that significant polarization degree is often observed in radio observations (van Weeren et al 2010;van Weeren et al 2012;Ozawa et al 2015). Diffusive shock acceleration (DSA) is the most promising particle acceleration process.…”
Section: Radio Relicsupporting
confidence: 55%
“…Faraday tomography is a powerful tool to study the Faraday structure along a LOS, and is superseding classical RM study. Indeed, multiple polarized sources and their Faraday depths were successfully resolved, even though they were not spatially resolved in radio/polarization images (O'Sullivan et al 2012;Ozawa et al 2015). The FDF intrinsically contain rich information about distributions of magnetic fields, thermal electrons, and CR electrons along the LOS in the sense that the FDF indicates the synchrotron polarization as a function of Faraday depth.…”
Section: Faraday Tomographymentioning
confidence: 99%
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“…A fitting model is often given as a function of λ 2 , and it has a specific form and parameters based on theoretical considerations such as depolarization (O'Sullivan et al 2012;Kaczmarek et al 2017). Contrastingly, an FDF with parameters, F(φ), can also be a fitting model (Ideguchi et al 2014a;Ozawa et al 2015), while it should be Fourier-transformed into the polarized intensity to be fitted (see, Eq. (1)).…”
Section: Qu-fittingmentioning
confidence: 99%
“…In order to improve the quality, several techniques have been proposed. For example, RM CLEAN which removes the siderobes of the dirty Faraday spectrum (Högbom 1974;Heald et al 2009;Kumazaki et al 2014;Miyashita et al 2016), QU-fitting which is a model fitting method (O'Sullivan et al 2012;Ideguchi et al 2014a;Ozawa et al 2015;Kaczmarek et al 2017), and compres-sive sensing which assumes a sparsity of Faraday spectrum (Li et al 2011a,b;Andrecut et al 2012) have been widely used.…”
Section: Introductionmentioning
confidence: 99%