Results 31 to 40 of about 43,858 (281)

THE TURBULENCE VELOCITY POWER SPECTRUM OF NEUTRAL HYDROGEN IN THE SMALL MAGELLANIC CLOUD [PDF]

The Astrophysical Journal, 2015
We present the results of the Velocity Coordinate Spectrum (VCS) technique to calculate the velocity power spectrum of turbulence in the Small Magellanic Cloud (SMC) in 21cm emission. We have obtained a velocity spectral index of -3.85 and an injection scale of 2.3 kpc. The spectral index is steeper than the Kolmogorov index which is expected for shock-
Chepurnov, Alexey, Burkhart, Blakesley, Lazarian, Alex, Stanimirovic, Snezana   +3 more
openaire   +2 more sources

The Astrochemical Evolution of Turbulent Giant Molecular Clouds : I - Physical Processes and Method of Solution for Hydrodynamic, Embedded Starless Clouds [PDF]

, 2013
Contemporary galactic star formation occurs predominantly within gravitationally unstable, cold, dense molecular gas within supersonic, turbulent, magnetized giant molecular clouds (GMCs).
Fisher, Robert T., Kumar, Avinash
core   +1 more source

Neutral Hydrogen (H i) 21 cm as a Probe: Investigating Spatial Variations in Interstellar Turbulent Properties

The Astrophysical Journal, 2023
Interstellar turbulence shapes the H i distribution in the Milky Way (MW). How this affects large-scale statistical properties of H i column density across the MW remains largely unconstrained.
Amit Kumar Mittal, Brian L. Babler, Snežana Stanimirović, Nickolas Pingel   +3 more
doaj   +1 more source

10. Radio observations of interstellar neutral hydrogen clouds [PDF]

Symposium - International Astronomical Union, 1957
The detailed relationship between optical interstellar absorption lines and 21-cm. observations is investigated in this paper.Dr Guido Münch, of the Mount Wilson and Palomar Observatories, provided the list of six intermediate-latitude stars shown in Table 1. The spectra of these stars all show complex absorption lines due to interstellar Ca 11. The 21-
openaire   +1 more source

A Catalog of HI Clouds in the Large Magellanic Cloud

, 2007
A 21 cm neutral hydrogen interferometric survey of the Large Magellanic Cloud (LMC) combined with the Parkes multi-beam HI single-dish survey clearly shows that the HI gas is distributed in the form of clumps or clouds. The HI clouds and clumps have been
B. G. Elmegreen, D. McConnell, E. Rosolowsky, Fukui Y., Heithausen A., Hennebelle P., K. C. Freeman, Kramer C., Larson R. B., Lee Y., M. A. Dopita, M. Kesteven, Meaburn J., Mizuno N., R. J. Sault, S. Kim, Y. C. Jung, Y. Kim, Y. Lee, Y.‐H. Chu   +19 more
core   +1 more source

Engineering Strategies for Stable and Long‐Life Alkaline Zinc‐Based Flow Batteries

Advanced Functional Materials, EarlyView.
Alkaline zinc‐based flow batteries face persistent challenges from unstable zinc deposition, including dendrite growth, passivation, corrosion, and hydrogen evolution, which severely limit cycling stability. Current research addresses these issues through coordinated electrode structuring, electrolyte regulation, and membrane design to control zinc ...
Yuran Bai, Xiaoyu Huo, Xin Long, Enkang Fu, Xusong Gong, Lei Wei, Liang An   +6 more
wiley   +1 more source

Atomic and Molecular Gas in the Milky Way. I. Structure Decomposition

The Astrophysical Journal
We present GDCluster, a fully automated algorithm for decomposing a spectral-line data cube of interstellar gas into coherent structures. Assuming a multi-Gaussian nature of observed spectra, GDCluster employs and augments the derivative spectroscopy ...
Xin Liu, Fujun Du
doaj   +1 more source

Graphene Nanosheet‐Based Mixed Proton‐Electron Conducting Membranes for Efficient Hydrogen Purification

Advanced Functional Materials, EarlyView.
A monolayer graphene/phosphoric‐acid mixed proton‐electron conducting membrane combines proton‐conducting nanoconfined acid channels with electron‐conducting graphene nanosheets for efficient high‐temperature hydrogen purification. The membrane achieves nearly 100% H2/CO2 selectivity and 69 GPU hydrogen permeance at 250°C, arising from synergistic ...
Kaiqiang He, Fanmengjing Wang, Dehua Dong, Yuan Kang, Zhikao Li, Jacek J. Jasieniak, Paul A. Webley, Douglas R. MacFarlane, Huanting Wang   +8 more
wiley   +1 more source

FEASTS and MHONGOOSE: H I Column Density Distribution at z = 0 for NHI > 1017.8​​​​​​ cm−2

The Astrophysical Journal
We present the first z = 0 H I column density distribution function, f ( N _HI ), extending down to $\mathrm{log}({N}_{{\rm{HI}}}/{{\rm{cm}}}^{-2})=17.8$ . This was derived from high-sensitivity 21 cm emission-line imaging at ∼1 kpc resolution.
Jing Wang, Xuchen Lin, Ze-Zhong Liang, W. J. G. de Blok, Hong Guo, Zhijie Qu, Céline Péroux, Kentaro Nagamine, Luis C. Ho, Dong Yang, Simon Weng, Claudia del P. Lagos, Xinkai Chen, George Heald, J. Healy, Qifeng Huang, Peter Kamphuis, D. Kleiner, Di Li, Siqi Liu, F. M. Maccagni, Lister Staveley-Smith, Zherong Su, Freeke van de Voort, Fabian Walter, Fangxiong Zhong, Siwei Zou   +26 more
doaj   +1 more source

A Search for Gas-Rich Dwarf Galaxies in the Local Universe with ALFALFA and the WIYN One Degree Imager

The Astronomical Journal, 2023
We present results from an optical search for Local Group dwarf galaxy candidates associated with the Ultra-Compact High Velocity Clouds (UCHVCs) discovered by the ALFALFA neutral hydrogen survey.
Katherine L. Rhode, Nicholas J. Smith, William F. Janesh, John J. Salzer, Elizabeth A. K. Adams, Martha P. Haynes, Steven Janowiecki, John M. Cannon   +7 more
doaj   +1 more source