Lyα emitters at z = 6.5 in the SSA22 field: A large-scale fluctuation of the neutral hydrogen fraction at the end of the reionizaion epoch?

2010 ◽  
Author(s):  
A. K. Inoue ◽  
E. Nakamura ◽  
T. Hayashino ◽  
M. Horie ◽  
K. Kousai ◽  
...  
Keyword(s):  
Large Scale ◽  
Neutral Hydrogen ◽  
Scale Fluctuation ◽  
Large Scale Fluctuation

Analysis of large-scale fluctuation structures in the scrape-off layer of the Wendelstein 7-AS stellarator

2001 ◽  
Vol 8 (12) ◽  
pp. 5171-5180 ◽  
Author(s):  
O. Grulke ◽  
T. Klinger ◽  
M. Endler ◽  
A. Piel ◽  
Keyword(s):  
Large Scale ◽  
Scale Fluctuation ◽  
Large Scale Fluctuation

scholarly journals On Landau’s prediction for large-scale fluctuation of turbulence energy dissipation

2006 ◽  
Vol 18 (1) ◽  
pp. 015103 ◽  
Author(s):  
Hideaki Mouri ◽  
Masanori Takaoka ◽  
Akihiro Hori ◽  
Yoshihide Kawashima
Keyword(s):  
Energy Dissipation ◽  
Large Scale ◽  
Turbulence Energy ◽  
Turbulence Energy Dissipation ◽  
Scale Fluctuation ◽  
Large Scale Fluctuation

Two-point Correlation Function and Power Spectrum at Very Large Scales

2005 ◽  
Vol 201 ◽  
pp. 449-450
Author(s):  
Z.-G. Deng ◽  
X.-Y. Xia
Keyword(s):  
Correlation Function ◽  
Power Spectrum ◽  
Correlation Functions ◽  
Large Scale ◽  
Wave Number ◽  
Scale Fluctuation ◽  
Point Correlation ◽  
Point Correlation Function ◽  
Redshift Survey ◽  
Large Scale Fluctuation

Subsamples of galaxies with different morphological types have been sorted out from Stromlo-APM redshift survey. Two-point correlation function for each subsample has been calculated. The two-point correlation functions for all subsamples show very large scale fluctuation. We show that the two-point correlation function with fluctuation could be fitted by a modified power spectrum with power excess at wave number comparable to the scale of the fluctuation.

scholarly journals Study of the X-Ray Background Spectrum and Its Large-Scale Fluctuation with ASCA

2002 ◽  
Vol 54 (3) ◽  
pp. 327-352 ◽  
Author(s):  
Akihiro Kushino ◽  
Yoshitaka Ishisaki ◽  
Umeyo Morita ◽  
Noriko Y. Yamasaki ◽  
Manabu Ishida ◽  
...  
Keyword(s):  
Large Scale ◽  
Background Spectrum ◽  
X Ray ◽  
Scale Fluctuation ◽  
X Ray Background ◽  
Large Scale Fluctuation

A numerical study of the transition of jet diffusion flames

1990 ◽  
Vol 431 (1882) ◽  
pp. 301-314 ◽  
Keyword(s):  
Reynolds Number ◽  
Diffusion Coefficient ◽  
Large Scale ◽  
Numerical Study ◽  
Small Scale ◽  
Surface Model ◽  
Flame Surface ◽  
Transition Mechanism ◽  
Air Stream ◽  
Scale Fluctuation

A numerical study on the transition from laminar to turbulent of two-dimensional fuel jet flames developed in a co-flowing air stream was made by adopting the flame surface model of infinite chemical reaction rate and unit Lewis number. The time dependent compressible Navier–Stokes equation was solved numerically with the equation for coupling function by using a finite difference method. The temperature-dependence of viscosity and diffusion coefficient were taken into account so as to study effects of increases of these coefficients on the transition. The numerical calculation was done for the case when methane is injected into a co-flowing air stream with variable injection Reynolds number up to 2500. When the Reynolds number was smaller than 1000 the flame, as well as the flow, remained laminar in the calculated domain. As the Reynolds number was increased above this value, a transition point appeared along the flame, downstream of which the flame and flow began to fluctuate. Two kinds of fluctuations were observed, a small scale fluctuation near the jet axis and a large scale fluctuation outside the flame surface, both of the same origin, due to the Kelvin–Helmholtz instability. The radial distributions of density and transport coefficients were found to play dominant roles in this instability, and hence in the transition mechanism. The decreased density in the flame accelerated the instability, while the increase in viscosity had a stabilizing effect. However, the most important effect was the increase in diffusion coefficient. The increase shifted the flame surface, where the large density decrease occurs, outside the shear layer of the jet and produced a thick viscous layer surrounding the jet which effectively suppressed the instability.

scholarly journals Reconstructing large-scale structure with neutral hydrogen surveys

2019 ◽  
Vol 2019 (11) ◽  
pp. 023-023 ◽  
Author(s):  
Chirag Modi ◽  
Martin White ◽  
Anže Slosar ◽  
Emanuele Castorina
Keyword(s):  
Large Scale ◽  
Neutral Hydrogen ◽  
Large Scale Structure ◽  
Scale Structure

scholarly journals Neutral Hydrogen in the Magellanic Clouds

1999 ◽  
Vol 190 ◽  
pp. 37-44
Author(s):  
L. Staveley-Smith ◽  
S. Kim ◽  
S. Stanimirović
Keyword(s):  
Atomic Hydrogen ◽  
Large Scale ◽  
Milky Way ◽  
Velocity Dispersion ◽  
Neutral Hydrogen ◽  
Distribution Functions ◽  
Magellanic Clouds ◽  
Self Gravity ◽  
Rotational Shear ◽  
Compact Array

We review observations of neutral atomic hydrogen (HI) in the Magellanic Clouds (MCs). Being the nearest gas-rich neighbours of the Milky Way the MCs give us an excellent opportunity to study in detail the structure and evolution of the interstellar medium (ISM) and the effect of interactions between galaxies. HI in emission provides a probe of the structure and velocity field of the Clouds, allowing the study of their velocity dispersion, 3-D structure, and large-scale total-mass distribution. Recent data from Australia Telescope Compact Array surveys reveal a morphology (for both Clouds) which is heavily dominated by the effects of local star-formation, rotational shear, fragmentation, self-gravity and turbulence. The new data, which has a spatial resolution down to 10 pc, also allows the study of the distribution functions in velocity and mass for HI clouds. We discuss the morphology, dynamics and giant shell population of the LMC and SMC.

Sign in / Sign up

Export Citation Format

Share Document