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The Monogem Ring is a huge bright soft X-ray enhancement with a diameter of ~ 25$\degr$. This 0.3 kpc distant structure is a peculiar Galactic supernova remnant in that it is obviously visible only in X-rays, due to its expansion into a…

天体物理学 · 物理学 2009-11-11 R. Weinberger , S. Temporin , B. Stecklum

Studying the interaction between AGN jets and lobes and their surrounding environment is important in order to understand how they transfer energy to their environment as well as determining the intrinsic physical properties of the sources…

星系天体物理 · 物理学 2018-11-08 S. Knuettel , S. P. O'Sullivan , S. Curiel , B. H. C. Emonts

We study a conspicuous ring-like structure with a radius of about 1.4 degrees which was observed with the Westerbork Synthesis Radio Telescope (WSRT) at 5 frequencies around 350 MHz. This ring is very prominent in Stokes Q and U, and less…

天体物理学 · 物理学 2009-11-07 M. Haverkorn , P. Katgert , A. G. de Bruyn

We present new 6 and 20 cm Very Large Array (VLA) observations of polarized continuum emission of roughly 0.5 square degrees of the Galactic center (GC) region. The 6 cm observations detect diffuse linearly-polarized emission throughout the…

星系天体物理 · 物理学 2015-05-27 C. J. Law , M. A. Brentjens , G. Novak

Faraday Rotation Measures (RM) should be interpreted with caution because there could be multiple magneto-ionized medium components that contribute to the net Faraday rotation along sight-lines. We introduce a simple test using Galactic…

星系天体物理 · 物理学 2021-10-13 Seoyoung Lyla Jung , Naomi M. McClure-Griffiths , Alex S. Hill

We present results of a wideband high-resolution polarization study of Hydra A, one of the most luminous FR I radio galaxies known and amongst the most well-studied. The radio emission from this source displays extremely large Faraday…

星系天体物理 · 物理学 2023-08-14 Lerato Baidoo , Richard A. Perley , Jean Eilek , Oleg Smirnov , Valentina Vacca , Torsten Ensslin

We aim to unveil their 3-dimensional geometry of Abell 2255 through WSRT observations at 18, 21, 25, 85, and 200 cm. The polarization images of the cluster were processed through rotation measure (RM) synthesis, producing three final RM…

宇宙学与河外天体物理 · 物理学 2015-05-19 R. F. Pizzo , A. G. de Bruyn , G. Bernardi , M. A. Brentjens

The repeating FRB source, FRB 20201124A, was found to be highly active in March and April 2021. We observed the source with the Effelsberg 100-m radio telescope at 1.36 GHz on 9 April 2021 and detected 20 bursts. A downward drift in…

高能天体物理现象 · 物理学 2021-11-01 G. H. Hilmarsson , L. G. Spitler , R. A. Main , D. Z. Li

Using data from the Galactic Arecibo L-band Feed Array Continuum Transit Survey (GALFACTS), we report the discovery of two previously unidentified, very compressed, thin, and straight polarized filaments approximately centred at Galactic…

We present high resolution images of the Faraday Rotation Measure (RM) structure of the radio galaxy PKS 1246-410, at the center of the Centaurus cluster. Comparison with Halpha-line and soft X-ray emission reveals a correspondence between…

天体物理学 · 物理学 2009-11-13 G. B. Taylor , A. C. Fabian , G. Gentile , S. W. Allen , C. Crawford , J. S. Sanders

We report on high angular resolution polarimetric observations of the nearby radio galaxy M87 using the Very Long Baseline Array at 24 GHz ($\lambda=$1.3 cm) and 43 GHz ($\lambda=$7 mm) in 2017-2018. New images of the linear polarization…

星系天体物理 · 物理学 2020-06-15 E. V. Kravchenko , M. Giroletti , K. Hada , D. L. Meier , M. Nakamura , J. Park , R. C. Walker

The Galactic interstellar medium hosts a significant magnetic field, which can be probed through the synchrotron emission produced from its interaction with relativistic electrons. Linearly polarized synchrotron emission is generated…

Rotation measures of pulsars and extragalactic point sources have been known to reveal large-scale antisymmetries in the Faraday rotation sky with respect to the Galactic plane and halo that have been interpreted as signatures of the mean…

The configuration of the regular magnetic field in M31 is deduced from radio polarization observations at the wavelengths 6, 11 and 20 cm. By fitting the observed azimuthal distribution of polarization angles, we find that the regular…

天体物理学 · 物理学 2009-11-10 A. Fletcher , E. M. Berkhuijsen , R. Beck , A. Shukurov

We present high sensitivity and absolutely calibrated images of diffuse radio polarisation at a resolution of about 10 arcmin covering the range 10 degr <l<34 degr and |b|<5 degr at 2.3 GHz from the S-band Parkes All Sky Survey and at 4.8…

星系天体物理 · 物理学 2015-06-17 X. H. Sun , B. M. Gaensler , E. Carretti , C. R. Purcell , L. Stavelley-Smith , G. Bernardi , M. Haverkorn

G156.2+5.7 is a large supernova remnant (SNR) first discovered in the ROSAT X-ray survey but radio observations are rare because of its low surface brightness and large size. Radio continuum and polarization images of the SNR G156.2+5.7 at…

天体物理学 · 物理学 2009-11-13 J. W. Xu , J. L. Han , X. H. Sun , W. Reich , L. Xiao , P. Reich , R. Wielebinski

The technique of Faraday tomography is a key tool for the study of magnetised plasmas in the new era of broadband radio polarisation observations. In particular, observations at metre-wavelengths provide significantly better Faraday depth…

We present polarization and Faraday rotation for the supernova remnants (SNRs) G46.8-0.3, G43.3-0.2, G41.1-0.3, and G39.2-0.3 in L-band (1-2 GHz) radio continuum in The HI/OH/Recombination line (THOR) survey. We detect polarization from…

The vast majority of Galactic supernova remnants (SNRs) were detected by their synchrotron radio emission. Recently, the evolved SNR G107.0+9.0 with a diameter of about 3~deg or 75~pc up to 100~pc in size was optically detected with an…

星系天体物理 · 物理学 2021-11-03 Wolfgang Reich , Xuyang Gao , Patricia Reich

Context. Submillimeter Array (SMA) 870 micron polarization observations of the hot molecular core G31.41+0.31 revealed one of the clearest examples up to date of an hourglass-shaped magnetic field morphology in a high-mass star-forming…

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