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Related papers: Large-scale magnetic field structure of NGC 3627 b…

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We have determined 194 Faraday rotation measures (RMs) of polarized extragalactic radio sources using new, multi-channel polarization observations at frequencies around 1.4 GHz from the Very Large Array (VLA) in the Galactic plane at…

Context. Regularly-spaced, star-forming regions along the spiral arms of nearby galaxies provide insight into the early stages and initial conditions of star formation. The regular separation of these star-forming regions suggests spiral…

Astrophysics of Galaxies · Physics 2024-07-24 Raghav Arora , Christoph Federrath , Robi Banerjee , Bastian Körtgen

Magnetic fields play a fundamental role in protostellar collapse and disk formation, yet direct measurements of magnetic field strength in deeply embedded protostellar envelopes remain difficult. We present a new method to estimate both the…

Earth and Planetary Astrophysics · Physics 2026-03-24 Yisheng Tu , Xiaoyuan Yang , Zhi-Yun Li

We seek to exploit the expanded observational range of the MeerKAT radio telescope with the new S-band receivers (2.0-2.8 GHz). To showcase its enhanced capabilities, we conducted new S-band observations of the galaxy NGC 2997 in full…

We propose a new self-consistent dynamo mechanism for the generation of large-scale magnetic fields in natural objects. Recent computational studies have described the formation of large-scale vortices (LSVs) in rotating turbulent…

Fluid Dynamics · Physics 2015-06-24 Celine Guervilly , David W. Hughes , Chris A. Jones

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…

Astrophysics · Physics 2009-11-07 M. Haverkorn , P. Katgert , A. G. de Bruyn

We analyze two-armed global spiral density wave modes generated by gravitational instability in razor-thin, non-viscous, self-gravitating protoplanetary disks to understand the dependence of spiral arm morphology (pitch angle $\alpha$ and…

Earth and Planetary Astrophysics · Physics 2021-01-13 Enze Chen , Si-Yue Yu , Luis C. Ho

Magnetic fields may play a crucial role in setting the initial conditions of massive star and star cluster formation. To investigate this, we report SOFIA-HAWC+ $214\:\mu$m observations of polarized thermal dust emission and high-resolution…

We present here two H II region catalogues with azimuthal resolution for the two grand design galaxies NGC 628 and NGC 6946. With the help of these catalogues, we study several properties of the star-forming processes occurring in spiral…

Astrophysics of Galaxies · Physics 2026-02-11 Bernabé Cedrés , Jordi Cepa , Ángel Bongiovanni , Héctor Castañeda , Miguel Sánchez-Portal , A. Tomita

We aim to characterise the magnetic field of the eclipsing binary CU Cnc. The determination of magnetic field parameters of this target enables comparisons with both observations of similar stars and theoretical predictions of the magnetic…

Solar and Stellar Astrophysics · Physics 2024-02-02 A. Hahlin , O. Kochukhov , A. D. Rains , J. Morin , G. Hussain , L. Hebb , K. Stassun

We present a study of the line-of-sight magnetic fields in five large-diameter Galactic HII regions. Using the Faraday rotation of background polarized radio sources, as well as dust-corrected H-alpha surface brightness as a probe of…

Astrophysics of Galaxies · Physics 2015-05-28 Lisa Harvey-Smith , Gregory J. Madsen , Bryan M. Gaensler

The origin of large-scale and coherent magnetic fields in astrophysical discs is an important and long standing problem. Researchers commonly appeal to a turbulent dynamo, sustained by the magneto-rotational instability (MRI), to supply the…

High Energy Astrophysical Phenomena · Physics 2018-10-24 A. Riols , H. Latter

A full understanding of high-mass star formation requires the study of one of the most elusive components of the energy balance in the interstellar medium: magnetic fields. We report ALMA 1.2 mm, high-resolution (700 au) dust polarization…

We present a detailed analysis of the kinematics of the Galactic globular cluster NGC 6397 based on more than ~18,000 spectra obtained with the novel integral field spectrograph MUSE. While NGC 6397 is often considered a core collapse…

Because of its proximity the Virgo Cluster is an excellent target for studying interactions of galaxies with the cluster environment. Both the high-velocity tidal interactions and effects of ram pressure stripping by the intracluster gas…

Astrophysics · Physics 2015-05-13 M. Wezgowiec , M. Urbanik , B. Vollmer , R. Beck , K. T. Chyzy , M. Soida , Ch. Balkowski

Two flocculent galaxies NGC 3521 and NGC 5055 has been observed at 10.55GHz with the Effelsberg 100m telescope. In both cases polarized emission reveals substantial radial component of regular magnetic field - similar to that in…

Astrophysics · Physics 2007-05-23 J. Knapik , M. Soida , R. -J. Dettmar , R. Beck , M. Urbanik

To characterize the magnetic field structure of the outflow and core region within a prototypical high-mass star-forming region, we analyzed polarized CO(3-2) - for the first time observed with the Submillimeter Array -- as well as 880mum…

Solar and Stellar Astrophysics · Physics 2015-05-20 H. Beuther , W. H. T. Vlemmings , R. Rao , F. F. S. van der Tak

We use a scanning nanometer-scale superconducting quantum interference device to map the stray magnetic field produced by individual ferromagnetic nanotubes (FNTs) as a function of applied magnetic field. The images are taken as each FNT is…

We carried out the near-infrared ($JHK_{\rm s}$) imaging polarimetric observation with the polarimeter SIRPOL on the Infrared Survey Facility (IRSF) 1.4 m telescope and [CII] line mapping observation with a Fabry-P\'{e}rot spectrometer on…

We present results of three-dimensional nonlinear MHD simulations of a large-scale magnetic field and its evolution inside a barred galaxy with the back reaction of the magnetic field on the gas. The model does not consider the dynamo…

Astrophysics of Galaxies · Physics 2015-05-13 B. Kulesza-Zydzik , K. Kulpa-Dybel , K. Otmianowska-Mazur , G. Kowal , M. Soida