Fisher analysis on wide-band polarimetry for probing the intergalactic magnetic field

Ideguchi, Shinsuke; Takahashi, Keitaro; Akahori, Takuya; Kumazaki, Kohei; Ryu, Dongsu

doi:10.1093/pasj/pst007

Cited by 29 publications

(23 citation statements)

References 42 publications

(40 reference statements)

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“…The modern techniques of analysis, such as model fitting of the fractional polarization components q and u (e.g., Farnsworth et al 2011;Ideguchi et al 2014), rotation measure synthesis (e.g., Brentjens & de Bruyn 2005;Akahori et al 2014b) and Faraday synthesis (Bell & Enßlin 2012), and the future radio surveys will partially overcome this problem. The large bandwidth of the new radio interferometers will allow us to reduce the risk of nπ-ambiguity, which is particularly strong when the λ 2 -fit approach is used, as well as to reach a sufficiently high resolution in Faraday depth to distinguish nearby Faraday components.…”

Section: Discussionmentioning

confidence: 99%

Using rotation measure grids to detect cosmological magnetic fields: A Bayesian approach

Vacca

Oppermann

Enßlin

et al. 2016

A&A

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Determining magnetic field properties in different environments of the cosmic large-scale structure as well as their evolution over redshift is a fundamental step toward uncovering the origin of cosmic magnetic fields. Radio observations permit the study of extragalactic magnetic fields via measurements of the Faraday depth of extragalactic radio sources. Our aim is to investigate how much different extragalactic environments contribute to the Faraday depth variance of these sources. We develop a Bayesian algorithm to distinguish statistically Faraday depth variance contributions intrinsic to the source from those due to the medium between the source and the observer. In our algorithm the Galactic foreground and measurement noise are taken into account as the uncertainty correlations of the Galactic model. Additionally, our algorithm allows for the investigation of possible redshift evolution of the extragalactic contribution. This work presents the derivation of the algorithm and tests performed on mock observations. Because cosmic magnetism is one of the key science projects of the new generation of radio interferometers, we have predicted the performance of our algorithm on mock data collected with these instruments. According to our tests, high-quality catalogs of a few thousands of sources should already enable us to investigate magnetic fields in the cosmic structure.

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Section: Discussionmentioning

confidence: 99%

Using rotation measure grids to detect cosmological magnetic fields: A Bayesian approach

Vacca

Oppermann

Enßlin

et al. 2016

A&A

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“…We can investigate optimum frequency coverage using a simple FDF model described above [65]. We estimate confidence intervals of the model parameters by means of the Fisher information matrix [66]. Given the data at 1400-1420 MHz and 1500-1600 MHz, let us explore the optimum frequency of the P * band, which has a 20-MHz or 40-MHz bandwidth and is in 300-1000 MHz.…”

Section: Optimum Frequency For Exploring the Igmfmentioning

confidence: 99%

Strategy to Explore Magnetized Cosmic Web with Forthcoming Large Surveys of Rotation Measure

Akahori

2018

Galaxies

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The warm-hot intergalactic medium (WHIM) is a candidate for the missing baryons in the Universe. If the WHIM is permeated with the intergalactic magnetic field (IGMF), the Faraday rotation measure (RM) of the WHIM is imprinted in linearly-polarized emission from extragalactic objects. In this article, we discuss strategies to explore the WHIM’s RM from forthcoming radio broadband and wide-field polarization sky surveys. There will be two observational breakthroughs in the coming decades; the RM grid and Faraday tomography. They will allow us to find ideal RM sources for the study of the IGMF and give us unique information of the WHIM along the line of sight.

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“…We employed Markov chain Monte Carlo QU-fitting as our choice of the Faraday-tomography method [14][15][16]. QU-fitting is a model-fitting method to reconstruct of polarized sources along a line of sight from an observed polarized spectrum.…”

Section: Modelmentioning

confidence: 99%

Faraday Tomography of the SS433 Jet Termination Region

et al. 2018

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A jet termination region provides us with useful information about how a jet interacts with the interstellar medium. Identifying the strength and orientation of magnetic fields at the terminal is crucially important to understanding the mechanism of cosmic-ray acceleration. In this article, we report results of our Faraday-tomography analysis of the eastern region of the radio nebula W50, where a jet from the microquasar SS433 seems to terminate. We apply QU-fitting, a method of Faraday-tomography, to data from the Australia Telescope Compact Array (ATCA) at 1.3–3.0 GHz. In the analysis, we distinguish multiple polarized sources along the line of sight. We identify Galactic emission candidates at Faraday depths around 0 rad m−2 and 300 rad m−2. The Galactic emission around 0 rad m−2 is possibly located in front of W50. We also find emission from W50 with Faraday depths between φ = −112 to 228 rad m−2.

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Fisher analysis on wide-band polarimetry for probing the intergalactic magnetic field

Cited by 29 publications

References 42 publications

Using rotation measure grids to detect cosmological magnetic fields: A Bayesian approach

Using rotation measure grids to detect cosmological magnetic fields: A Bayesian approach

Strategy to Explore Magnetized Cosmic Web with Forthcoming Large Surveys of Rotation Measure

Faraday Tomography of the SS433 Jet Termination Region

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