Faraday depolarization effects in spiral galaxies

Mami Machida, Takuya Akahori, Kenji E. Nakamura, Hiroyuki Nakanishi, Marijke Haverkorn

研究成果: ジャーナルへの寄稿記事

1 引用 (Scopus)

抄録

Magnetic fields in the universe play an essential role in observations of the radio synchrotron continuum; however, we do not know enough about them, either observationally or theoretically. We are interested in galactic magnetic fields because they affect the structural formation of galaxies in terms of star-forming regions, spiral arms, and threads at the galactic center. To clarify the importance of magnetic fields, we carried out numerical simulations of the galactic gaseous disk with magnetic fields. We also calculated observables, such as the rotation measure and Stokes parameters, from the results of numerical simulation. FD maps and intensity maps have been reported, and the relation between azimuthal angle and FD has been shown to depend on the inclination of the observer. Furthermore, it has been shown that a polarized intensity below 800 MHz reflects field structure in the halo region, although the intensity is weak. The present paper summarizes the effects of Faraday depolarization and the relation between magnetic-field structure and Stokes parameters.

元の言語英語
記事番号15
ジャーナルGalaxies
7
発行部数1
DOI
出版物ステータス出版済み - 1 12 2019

Fingerprint

spiral galaxies
depolarization
magnetic fields
interstellar magnetic fields
threads
inclination
halos
synchrotrons
simulation
universe
galaxies
continuums
stars

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

これを引用

Machida, M., Akahori, T., Nakamura, K. E., Nakanishi, H., & Haverkorn, M. (2019). Faraday depolarization effects in spiral galaxies. Galaxies, 7(1), [15]. https://doi.org/10.3390/galaxies7010015

Faraday depolarization effects in spiral galaxies. / Machida, Mami; Akahori, Takuya; Nakamura, Kenji E.; Nakanishi, Hiroyuki; Haverkorn, Marijke.

:: Galaxies, 巻 7, 番号 1, 15, 12.01.2019.

研究成果: ジャーナルへの寄稿記事

Machida, M, Akahori, T, Nakamura, KE, Nakanishi, H & Haverkorn, M 2019, 'Faraday depolarization effects in spiral galaxies', Galaxies, 巻. 7, 番号 1, 15. https://doi.org/10.3390/galaxies7010015
Machida M, Akahori T, Nakamura KE, Nakanishi H, Haverkorn M. Faraday depolarization effects in spiral galaxies. Galaxies. 2019 1 12;7(1). 15. https://doi.org/10.3390/galaxies7010015
Machida, Mami ; Akahori, Takuya ; Nakamura, Kenji E. ; Nakanishi, Hiroyuki ; Haverkorn, Marijke. / Faraday depolarization effects in spiral galaxies. :: Galaxies. 2019 ; 巻 7, 番号 1.
@article{b56bd4aaf6354a68acc732632a71934b,
title = "Faraday depolarization effects in spiral galaxies",
abstract = "Magnetic fields in the universe play an essential role in observations of the radio synchrotron continuum; however, we do not know enough about them, either observationally or theoretically. We are interested in galactic magnetic fields because they affect the structural formation of galaxies in terms of star-forming regions, spiral arms, and threads at the galactic center. To clarify the importance of magnetic fields, we carried out numerical simulations of the galactic gaseous disk with magnetic fields. We also calculated observables, such as the rotation measure and Stokes parameters, from the results of numerical simulation. FD maps and intensity maps have been reported, and the relation between azimuthal angle and FD has been shown to depend on the inclination of the observer. Furthermore, it has been shown that a polarized intensity below 800 MHz reflects field structure in the halo region, although the intensity is weak. The present paper summarizes the effects of Faraday depolarization and the relation between magnetic-field structure and Stokes parameters.",
author = "Mami Machida and Takuya Akahori and Nakamura, {Kenji E.} and Hiroyuki Nakanishi and Marijke Haverkorn",
year = "2019",
month = "1",
day = "12",
doi = "10.3390/galaxies7010015",
language = "English",
volume = "7",
journal = "Galaxies",
issn = "2075-4434",
publisher = "MDPI AG",
number = "1",

}

TY - JOUR

T1 - Faraday depolarization effects in spiral galaxies

AU - Machida, Mami

AU - Akahori, Takuya

AU - Nakamura, Kenji E.

AU - Nakanishi, Hiroyuki

AU - Haverkorn, Marijke

PY - 2019/1/12

Y1 - 2019/1/12

N2 - Magnetic fields in the universe play an essential role in observations of the radio synchrotron continuum; however, we do not know enough about them, either observationally or theoretically. We are interested in galactic magnetic fields because they affect the structural formation of galaxies in terms of star-forming regions, spiral arms, and threads at the galactic center. To clarify the importance of magnetic fields, we carried out numerical simulations of the galactic gaseous disk with magnetic fields. We also calculated observables, such as the rotation measure and Stokes parameters, from the results of numerical simulation. FD maps and intensity maps have been reported, and the relation between azimuthal angle and FD has been shown to depend on the inclination of the observer. Furthermore, it has been shown that a polarized intensity below 800 MHz reflects field structure in the halo region, although the intensity is weak. The present paper summarizes the effects of Faraday depolarization and the relation between magnetic-field structure and Stokes parameters.

AB - Magnetic fields in the universe play an essential role in observations of the radio synchrotron continuum; however, we do not know enough about them, either observationally or theoretically. We are interested in galactic magnetic fields because they affect the structural formation of galaxies in terms of star-forming regions, spiral arms, and threads at the galactic center. To clarify the importance of magnetic fields, we carried out numerical simulations of the galactic gaseous disk with magnetic fields. We also calculated observables, such as the rotation measure and Stokes parameters, from the results of numerical simulation. FD maps and intensity maps have been reported, and the relation between azimuthal angle and FD has been shown to depend on the inclination of the observer. Furthermore, it has been shown that a polarized intensity below 800 MHz reflects field structure in the halo region, although the intensity is weak. The present paper summarizes the effects of Faraday depolarization and the relation between magnetic-field structure and Stokes parameters.

UR - http://www.scopus.com/inward/record.url?scp=85060550037&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85060550037&partnerID=8YFLogxK

U2 - 10.3390/galaxies7010015

DO - 10.3390/galaxies7010015

M3 - Article

AN - SCOPUS:85060550037

VL - 7

JO - Galaxies

JF - Galaxies

SN - 2075-4434

IS - 1

M1 - 15

ER -