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Magnetic fields and turbulence may play a key role in the evolution of protoclusters, influencing the formation of dense cores and stars. Here, we examine the morphology of the magnetic fields in the G327.29 protocluster using both the…

Probing magnetic fields in astrophysical environments is both important and challenging. The Gradient Technique (GT) is a new tool for tracing magnetic fields, rooted in the properties of magnetohydrodynamic (MHD) turbulence and turbulent…

星系天体物理 · 物理学 2024-06-18 Yue Hu , Alex Lazarian

Star formation is a complex process that typically occurs in dense regions of molecular clouds mainly regulated by magnetic fields, magnetohydrodynamic (MHD) turbulence, and self-gravity. However, it remains a challenging endeavor to trace…

星系天体物理 · 物理学 2023-05-31 Tyler Schmaltz , Yue Hu , Alex Lazarian

Dwarf galaxies are important laboratories for studying cosmic magnetism because they can maintain strong magnetic fields via the action of turbulent dynamo despite their low mass and weak gravitational potential. The Magnetic-field…

Probing magnetic fields in Giant Molecular Clouds is often challenging. Fortunately, recently simulations show that analysis of velocity gradients (the Velocity Gradient Technique) can be used to map out the magnetic field morphology of…

星系天体物理 · 物理学 2019-11-06 Yue Hu , Ka Ho Yuen , A. Lazarian , Laura M. Fissel , P. A. Jones , M. R. Cunningham

Several recent numerical simulations of off-center cluster mergers predict that significant angular momentum with associated velocities of a few x 10^{3} km/s can be imparted to the resulting cluster. Such gas bulk velocities can be…

天体物理学 · 物理学 2009-11-06 Renato A. Dupke , Joel N. Bregman

Magnetic fields play an important role in the evolution of molecular clouds and star formation. Using the Velocity Gradient Technique (VGT) model, we measured the magnetic field in Orion A using the 12CO, 13CO, and C18O (1-0) emission lines…

This White Paper proposes a unique milli-Jansky sensitive arcsecond resolution VLA 15 GHz (Ku band) continuum polarization imaging survey of the Galactic plane using C array configuration. The science driver is to fill the gap between…

天体物理仪器与方法 · 物理学 2013-12-25 Lorant O. Sjouwerman , Elisabeth A. C. Mills

The central molecular zone (CMZ) plays an essential role in regulating the nuclear ecosystem of our Galaxy. To get an insight into the magnetic fields of the CMZ, we employ the Gradient Technique (GT), which is rooted in the anisotropy of…

星系天体物理 · 物理学 2022-02-09 Yue Hu , A. Lazarian , Q. Daniel Wang

This paper studies how to employ synchrotron emission gradient techniques to reveal the properties of the magnetic field within the interstellar media. Based on data cubes of three-dimensional numerical simulations of magnetohydrodynamic…

高能天体物理现象 · 物理学 2020-01-08 Jian-Fu Zhang , Qian Liu , Alex Lazarian

We present a method for determining directions of magnetic field vectors in a spiral galaxy using two synchrotron polarization maps, an optical image, and a velocity field. The orientation of the transverse magnetic field is determined with…

星系天体物理 · 物理学 2019-02-18 Hiroyuki Nakanishi , Kohei Kurahara , Kenta Anraku

Magnetic fields and their dynamical interplay with matter in galaxy clusters contribute to the physical properties and evolution of the intracluster medium. However, the current understanding of the origin and properties of cluster magnetic…

宇宙学与河外天体物理 · 物理学 2024-02-12 Yue Hu , C. Stuardi , A. Lazarian , G. Brunetti , A. Bonafede , Ka Wai Ho

Recent development of the velocity gradient technique shows the {\toreferee capability} of the technique in the way of tracing magnetic fields morphology in diffuse interstellar gas and molecular clouds. In this paper, we perform the…

星系天体物理 · 物理学 2023-02-01 Ka Wai Ho , Alex Lazarian

Context. Gravitational collapse theory and numerical simulations suggest that the velocity field within large-scale galaxy filaments is dominated by motions along the filaments. Aims. Our aim is to check whether observational data reveal…

宇宙学与河外天体物理 · 物理学 2015-03-25 Elmo Tempel , Antti Tamm

We employ synthetic observations obtained with MHD simulations to study how to trace the distribution of turbulent magnetic fields using the synchrotron polarization gradient techniques suggested by Lazarian \& Yuen (2018). Both synchrotron…

高能天体物理现象 · 物理学 2019-05-15 Jian-Fu Zhang , Alex Lazarian , Ka Wai Ho , Ka Ho Yuen , Bo Yang , Yue Hu

The effects of many physical processes in the intracluster medium of galaxy clusters imprint themselves in X-ray surface brightness images. It is therefore important to choose optimal methods for extracting information from and enhancing…

宇宙学与河外天体物理 · 物理学 2016-06-15 J. S. Sanders , A. C. Fabian , H. R. Russell , S. A. Walker , K. M. Blundell

We study the alignment and rotational disruption of dust grains at the centre of our Galaxy using polarized thermal dust emission observed by SOFIA/HAWC+ and JCMT/SCUPOL at 53, 216, and 850 $\mu$m. We analyzed the relationship between the…

星系天体物理 · 物理学 2023-05-01 M. S. Akshaya , Thiem Hoang

We present a novel method to search for structures of coherently aligned patterns in ultra-high energy cosmic-ray arrival directions simultaneously across the entire sky. This method can be used to obtain information on the Galactic…

天体物理仪器与方法 · 物理学 2022-01-31 Marcus Wirtz , Teresa Bister , Martin Erdmann

Clusters of galaxies, filled with hot magnetized plasma, are the largest bound objects in existence and an important touchstone in understanding the formation of structures in our Universe. In such clusters, thermal conduction follows field…

宇宙学与河外天体物理 · 物理学 2015-05-14 Christoph Pfrommer , L. Jonathan Dursi

We explore how the velocity gradient technique (VGT) can be applied to absorbing media in the case of$^{13}$CO 2-1 emission. The VGT is a new way to trace magnetic fields in the plane of the sky using only spectroscopic observations. We…

星系天体物理 · 物理学 2019-06-13 Diego F. González-Casanova , A. Lazarian , Blakesley Burkhart