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相关论文: Caustics and velocity caustics in the diffuse inte…

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Context. The HI distribution at high Galactic latitudes is found to be filamentary and closely related to the far infrared (FIR) in caustics with coherent velocity structures. These structures trace the orientation of the magnetic field…

星系天体物理 · 物理学 2025-02-04 P. M. W. Kalberla

Dusty magnetized structures observable in the far-infrared (FIR) at high Galactic latitudes are ubiquitous and found to be closely related to HI filaments with coherent velocity structures. Considering dimensionless morphological…

星系天体物理 · 物理学 2023-05-17 P. M. W. Kalberla , U. Haud

Context. The interstellar medium is affected by turbulence and observed H i structures in channel maps are shaped by turbulent motions. It is taken for granted by a few theoreticians that observed H i structures do not represent real…

星系天体物理 · 物理学 2021-01-05 P. M. W. Kalberla , U. Haud

We characterize the kinematic and magnetic properties of HI filaments located in a high Galactic latitude region ($165^\circ < \alpha < 195^\circ$ and $12^\circ < \delta < 24^\circ$). We extract three-dimensional filamentary structures…

星系天体物理 · 物理学 2023-09-20 Doyeon Avery Kim , Susan E Clark , Mary E Putman , Larry Li

We investigate the physical properties of structures seen in channel map observations of 21-cm neutral hydrogen (HI) emission. HI intensity maps display prominent linear structures that are well aligned with the ambient magnetic field in…

星系天体物理 · 物理学 2019-04-11 S. E. Clark , J. E. G. Peek , M. -A. Miville-Deschênes

Context. HI filaments are closely related to dusty magnetized structures that are observable in the far infrared (FIR). Recently it was proposed that the coherence of oriented HI structures in velocity traces the line of sight magnetic…

星系天体物理 · 物理学 2022-05-04 P. M. W. Kalberla , J. Kerp , U. Haud

Context. Neutral atomic hydrogen (HI) absorption lines can be used to probe the cold neutral medium (CNM) at high Galactic latitudes. Cold HI with a significant optical depth from the GASKAP-HI survey is found to be located predominantly if…

星系天体物理 · 物理学 2025-11-26 P. M. W. Kalberla

The alignment of striated intensity structures in thin neutral hydrogen (HI) spectroscopic channels with Galactic magnetic fields has been observed. However, the origin and nature of these striations are still debatable. Some studies…

星系天体物理 · 物理学 2023-07-05 Yue Hu , A. Lazarian , D. Alina , D. Pogosyan , Ka Wai Ho

Recent \herschel\ and \planck\ observations of submillimeter dust emission revealed the omnipresence of filamentary structures in the interstellar medium (ISM). The ubiquity of filaments in quiescent clouds as well as in star-forming…

星系天体物理 · 物理学 2017-12-05 Doris Arzoumanian

The Planck survey has quantified polarized Galactic foregrounds and established that they are a main limiting factor in the quest for the cosmic microwave background (CMB) B-mode signal induced by primordial gravitational waves during…

We present findings of 3D filamentary structures in the Smith Cloud, a high-velocity cloud (HVC) located at $l=38^{\circ}$, $b=-13^{\circ}$. We use data from the Galactic Arecibo L-Band Feed Array \ion{H}{i} (GALFA-\ion{H}{i}) along with…

星系天体物理 · 物理学 2025-05-06 Colin Holm-Hansen , M. E. Putman , D. A. Kim

We present a study of the filamentary structure in the emission from the neutral atomic hydrogen (HI) at 21 cm across velocity channels in the 40'' and 1.5-km/s resolution position-position-velocity cube resulting from the combination of…

Recent analyses of 21-cm neutral hydrogen (HI) emission have demonstrated that HI gas is organized into linear filamentary structures that are preferentially aligned with the local magnetic field, and that the coherence of these structures…

星系天体物理 · 物理学 2020-01-08 S. E. Clark , Brandon S. Hensley

The main goal of this analysis is to present a new method to estimate the physical properties of diffuse cloud of atomic hydrogen observed at high Galactic latitude. This method, based on a comparison of the observations with fractional…

天体物理学 · 物理学 2009-11-13 Marc-Antoine Miville-Deschenes , Peter G. Martin

Filaments are ubiquitous in the interstellar medium (ISM), yet their formation and evolution remains the topic of intense debate. In order to obtain a more comprehensive view of the 3D morphology and evolution of the Musca filament, we…

星系天体物理 · 物理学 2023-05-24 Aidan Kaminsky , Lars Bonne , Doris Arzoumanian , Simon Coudé

Cold dark matter haloes are populated by high-density structures with sharply-peaked profiles known as caustics which have not yet been resolved by 3-dimensional numerical simulations. Here, we derive semi-analytic expressions for the…

天体物理学 · 物理学 2009-11-10 Roya Mohayaee , Sergei Shandarin

Context. It is almost banal to say that the interstellar medium (ISM) is structurally and thermodynamically complex. But the variety of the governing processes, including stellar feedback, renders the investigation challenging. High…

星系天体物理 · 物理学 2023-08-30 Marco Monaci , Loris Magnani , Steven N. Shore , Henrik Olofsson , Mackenzie R. Joy

The warm neutral medium (WNM) was thought to be subsonically/transonically turbulent, and it lacks a network of intertwined filaments that are commonly seen in both molecular clouds and cold neutral medium (CNM). Here, we report HI~21 cm…

Many recent models consider the structure of individual interstellar medium (ISM) clouds as a way to explain observations of large parts of galaxies. To compare such models to observations, one must understand how to translate between…

宇宙学与河外天体物理 · 物理学 2015-06-15 Adam K. Leroy , Cheoljong Lee , Andreas Schruba , Alberto Bolatto , Annie Hughes , Jerome Pety , Karin Sandstrom , Eva Schinnerer , Fabian Walter

We present a study of the filamentary structure in the atomic hydrogen (HI) emission at the 21 cm wavelength toward the Galactic plane using the observations in the HI4PI survey. Using the Hessian matrix method across radial velocity…

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