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Radio continuum and polarization observations of several nearby galaxies allowed to determine their vertical scaleheights, magnetic field strengths and large-scale magnetic field patterns. They all show a similar large-scale magnetic field…

Astrophysics of Galaxies · Physics 2012-07-13 Marita Krause

We have measured the Faraday rotation toward a large sample of polarized radio sources behind the Large Magellanic Cloud (LMC), to determine the structure of this galaxy's magnetic field. The magnetic field of the LMC consists of a coherent…

Non-thermal X-ray emission in some supernova remnants originates from synchrotron radiation of ultra-relativistic particles in turbulent magnetic fields. We address the effect of a random magnetic field on synchrotron emission images and…

Astrophysics · Physics 2011-02-22 Andrei M. Bykov , Yury A. Uvarov , Donald C. Ellison

The shocks produced in the intergalactic medium during large-scale structure formation accelerate a population of highly relativistic electrons which emit synchrotron radiation due to intergalactic magnetic fields. In a previous paper (Loeb…

Astrophysics · Physics 2009-10-31 Eli Waxman , Abraham Loeb

Despite the importance of magnetic fields in massive stars, their origin is widely debated and still not well understood. With the mounting evidence for the importance of studying magnetic fields in interacting massive binary and multiple…

Solar and Stellar Astrophysics · Physics 2026-01-21 S. Hubrig , M. Abdul-Masih , S. P. Jarvinen , A. Cikota , M. Schöller , I. Ilyin , A. Escorza

We use Vector Spectromagnetograph (VSM) chromospheric full-disk magnetograms, from the Synoptic Optical Long-term Investigations of the Sun (SOLIS) project, to study the distribution of magnetic field flux concentrations within the polar…

Astrophysics · Physics 2008-01-08 N. -E. Raouafi , J. W. Harvey , C. J. Henney

Precise measurement of the foreground synchrotron emission, which contaminates the faint polarized cosmic microwave background radiation (CMB), is a major challenge for the next-generation of CMB experiments. To address this, dedicated…

RXTE and BeppoSAX observations have yielded evidence for the presence of a secondary power-law spectral component in the spectra of several clusters of galaxies. This emission in clusters with extended regions of radio emission is likely to…

Astrophysics · Physics 2016-11-09 Yoel Rephaeli

With the recent advent of circular polarization capabilities at the Atacama Large Millimeter/submillimeter Array (ALMA), Zeeman effect measurements of spectral lines are now possible as a means to directly probe line-of-sight magnetic…

Solar and Stellar Astrophysics · Physics 2020-11-04 Renato Mazzei , L. Ilsedore Cleeves , Zhi-Yun Li

Aims. To study at multiple frequencies the radio emission arising from the massive galaxy cluster MACS J0717.5+3745 (z=0.55). Known to be an extremely complex cluster merger, the system is uniquely suited for an investigation of the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 A. Bonafede , L. Feretti , G. Giovannini , F. Govoni , M. Murgia , G. B. Taylor , H. Ebeling , S. Allen , G. Gentile , Y. Pihlstrom

Primordial magnetic fields (PMFs) offer a compelling explanation for the origin of observed magnetic fields, especially on extragalactic scales. Such PMFs give rise to excess of power in small scale matter perturbations that could strongly…

Cosmology and Nongalactic Astrophysics · Physics 2023-06-22 Tal Adi , Sarah Libanore , Hector Afonso G. Cruz , Ely D. Kovetz

We set limits on the presence of the synchrotron cosmic web through the cross-correlation of the 2.3 GHz S-PASS survey with a model of the local cosmic web derived from constrained magnetohydrodynamic (MHD) simulations. The MHD simulation…

Cosmology and Nongalactic Astrophysics · Physics 2017-05-10 S. Brown , T. Vernstrom , E. Carretti , K. Dolag , B. M. Gaensler , L. Staveley-Smith , G. Bernardi , M. Haverkorn , M. Kesteven , S. Poppi

Synchrotron radio halos at the center of merging galaxy clusters provide the most spectacular and direct evidence of the presence of relativistic particles and magnetic fields associated with the intracluster medium. The study of polarized…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-15 F. Govoni , M. Murgia , H. Xu , H. Li , M. L. Norman , L. Feretti , G. Giovannini , V. Vacca

This paper presents the results of full polarization observations of the massive star-forming region W75N, conducted with 3 arcsec spatial resolutions at 345 GHz using the Submillimeter Array (SMA). The magnetic field structures in the…

Astrophysics of Galaxies · Physics 2023-07-13 Lingzhen Zeng , Qizhou Zhang , Felipe O. Alves , Tao-Chung Ching , Josep M. Girart , Junhao Liu

Observations of nearby star forming clouds with imaging X-ray telescopes have revealed that X-ray emission is elevated $10^1-10^4$ above main sequence levels in low-mass pre-main sequence (PMS) stars. The variability and spectral X-ray…

Astrophysics · Physics 2007-05-23 Eric D. Feigelson

Measuring radio waves at low frequencies offers a new window to study cosmic magnetism, and LOFAR is the ideal radio telescope to open this window widely. The LOFAR Magnetism Key Science Project (MKSP) draws together expertise from multiple…

Large-scale coherent magnetic fields in the intergalactic medium are presumed to play a key role in the formation and evolution of the cosmic web, and in large scale feedback mechanisms. However, they are theorized to be extremely weak, in…

Cosmology and Nongalactic Astrophysics · Physics 2021-03-23 Ariel Amaral , Tessa Vernstrom , Bryan M. Gaensler

The Parkes Galactic Meridian Survey (PGMS) is a 5 deg X 90 deg strip to map the polarized synchrotron emission along a Galactic meridian from the Galactic plane down to the south Galactic pole. The survey is carried out at the Parkes radio…

Recent observations of radio relics - diffuse radio emission in galaxy clusters - have revealed that these sources are not smooth but consist of structures in the form of threads and filaments. We investigate the origin of these filamentary…

Cosmology and Nongalactic Astrophysics · Physics 2023-05-31 Denis Wittor , Marcus Brüggen , Philipp Grete , Kamlesh Rajpurohit

The Universe's magnetogenesis can be investigated with radio observations of cosmic filaments, where the information on the initial magnetic field seeds is expected to be preserved in time. In this work, we update the comparison between…

Cosmology and Nongalactic Astrophysics · Physics 2025-05-27 Ettore Carretti , Franco Vazza
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