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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

We report the discovery of circularly polarised radio emission from the radio-jet X-ray binary SS 433 with the Australia Telescope Compact Array. The flux density spectrum of the circular polarization, clearly detected at four frequencies…

天体物理学 · 物理学 2009-10-31 Robert Fender , David Rayner , Ray Norris , R. J. Sault , Guy Pooley

The polarization properties of radio sources powered by an Active Galactic Nucleus (AGN) have attracted considerable attention because of the significance of magnetic fields in the physics of these sources, their use as probes of plasma…

星系天体物理 · 物理学 2021-03-17 Ryan S. Johnston , Jeroen M. Stil , Ben W. Keller

We present new deep multi-frequency radio-polarimetric images of a sample of high redshift radio galaxies (HzRGs), having redshift between 1.7 and 4.1. The radio data at 4.7 and 8.2 GHz were taken with the Very Large Array in the A…

天体物理学 · 物理学 2019-08-17 L. Pentericci , W. Van Reeven , C. L. Carilli , H. J. A. Rottgering , G. K. Miley

The new generations of multiwavelength radioheliographs with high spatial resolution will employ microwave imaging spectropolarimetry to recover flare topology and plasma parameters in the flare sources and along the wave propagation paths.…

太阳与恒星天体物理 · 物理学 2017-09-27 A. Altyntsev , N. Meshalkina , I. Myshyakov , V. Pal`shin , G. Fleishman

We report on polarimetric observations of 100 pulsars centered on 774 MHz, made using the Green Bank Telescope, presenting their polarization profiles and polarized flux densities and comparing them with previous observations when possible.…

太阳与恒星天体物理 · 物理学 2009-03-25 J. L. Han , P. B. Demorest , W. van Straten , A. G. Lyne

ALMA observations revealed recently polarised radiation of several protoplanetary disks in the (sub-)millimetre wavelength range. Besides self-scattering of large particles, thermal emission by elongated grains is a potential source for the…

地球与行星天体物理 · 物理学 2019-07-10 Florian Kirchschlager , Gesa H. -M. Bertrang , Mario Flock

Sgr A* is variable at radio and submillimeter wavelengths on hourly time scales showing time delays between the peaks of flare emission as well as linearly polarized emission at millimeter and sub-mm wavelengths. To determine the…

天体物理学 · 物理学 2009-11-13 F. Yusef-Zadeh , M. Wardle , W. D. Cotton , C. O. Heinke , D. A. Roberts

We report on multi-bands VLBA polarimetric observations of NRAO 530 in February 1997. Total intensity, EVPA distributions at all these frequencies are presented. Model fitting has been performed, from which the fitted southmost component A…

宇宙学与河外天体物理 · 物理学 2015-05-19 Y. J. Chen , Z. -Q. Shen , S. -W. Feng

Polarized diffuse emission observations at 2.3 GHz in a high Galactic latitude area are presented. The 2\degr X 2\degr field, centred in (\alpha=5^h,\delta=-49\degr), is located in the region observed by the BOOMERanG experiment. Our…

天体物理学 · 物理学 2009-11-10 E. Carretti , D. McConnell , N. M. McClure-Griffiths , G. Bernardi , S. Cortiglioni , S. Poppi

We report on a full-polarization analysis of the first 25 as yet non-repeating FRBs detected at 1.4 GHz by the 110-antenna Deep Synoptic Array (DSA-110) during commissioning observations. We present details of the data-reduction,…

We investigate how the imprint of Faraday rotation on radio spectra can be used to determine the geometry of radio sources and the strength and structure of the surrounding magnetic fields. We model spectra of Stokes Q and U for frequencies…

星系天体物理 · 物理学 2015-05-27 D. H. F. M. Schnitzeler , J. K. Banfield , K. J. Lee

We have carried out observations at 18.5 GHz with the Australia Telescope Compact Array (ATCA) of 250 out of the 258 Southern extragalactic sources in the complete 5 GHz 1 Jy sample by K\"uhr et al. (1981). In this paper we focus on the…

天体物理学 · 物理学 2009-11-10 R. Ricci , I. Prandoni , C. Gruppioni , R. J. Sault , G. De Zotti

We analyse the circular polarisation data accumulated in the first 7 years of the POLAMI project introduced in an accompanying paper (Agudo et al.). In the 3mm wavelength band, we acquired more than 2600 observations, and all but one of our…

We present five epochs of 15 GHz VLBA observations of 13 AGN. These observations were specially calibrated to detect parsec scale circular polarization and our calibration techniques are discussed and analyzed in detail. We obtained…

天体物理学 · 物理学 2009-10-31 D. C. Homan , J. F. C. Wardle

A small sample of 7 southern Compact Steep Spectrum (CSS) radio sources has been selected as part of the study of a larger flux-limited complete sample of radio sources. High resolution images, using the VLBI network in the southern…

We present high sensitivity ($\sigma_P \simeq 0.6\,$mJy) polarimetric observations in seven bands, from $2.1$ to $38\,$GHz, of a complete sample of $104$ compact extragalactic radio sources brighter than $200\,$mJy at $20\,$GHz.…

We observed with the VLBA at 2.3 and 8.6 GHz a complete flux-density limited sample of 482 radio sources with declination >+75 degrees brighter than 200 mJy at 1.4 GHz drawn from the NVSS catalog. 34% of the sources show parsec-scale…

星系天体物理 · 物理学 2021-02-01 Alexander V. Popkov , Yuri Y. Kovalev , Leonid Y. Petrov , Yuri A. Kovalev

Polarization behaviour shows a transition in the pulsar population, where energetic sources with higher spin-down energy loss, $\dot{E} > 10^{34}$ erg~s$^{-1}$, often have fractional linear polarisation ($L/I$) close to 100\%, while below…

高能天体物理现象 · 物理学 2025-05-20 Dipanjan Mitra , Rahul Basu , George I. Melikidze

This study investigates polarimetric characteristics of the blazar 3C~454.3 at 22-129~GHz using decadal~(2011-2022) data sets. In addition, we also delve into the origin of the polarization flare observed in 2019. The data sets were…