搜索结果: 1-15 共查到“星系与宇宙学 density”相关记录19条 . 查询时间(0.046 秒)
The environments of supernova explosions are often inhomogeneous, and there may be jumps in their density structure. We have developed a semianalytic model under the thin-shell approximation for super...
High-Density Molecular Gas in the Infrared-bright Galaxy System VV 114
kinematics and dynamics VV 114
2014/12/24
The new high-resolution CO (3-2) interferometric map of the IR-bright interacting galaxy system VV 114 observed with the Submillimeter Array reveals a substantial amount of warm and dense gas in the I...
Supernova Blast Waves in Low-Density Hot Media: A Mechanism for Spatially Distributed Heating
structure supernova remnants
2014/12/24
Most supernovae are expected to explode in low-density hot media, particularly in galactic bulges and elliptical galaxies. The remnants of such supernovae, although difficult to detect individually, c...
On the origin of cold dark matter halo density profiles
dark matter large-scale structure of the universe
2014/12/24
N-body simulations predict that cold dark matter (CDM) halo-assembly occurs in two phases: (i) a fast-accretion phase with a rapidly deepening potential well; and (ii) a slow-accretion phase character...
A Density Independent Formulation of Smoothed Particle Hydrodynamics
Density Independent Formulation Smoothed Particle Hydrodynamics Cosmology and Extragalactic Astrophysics
2012/2/21
In the standard formulation of the smoothed particle hydrodynamics (SPH), it is assumed that the local density distribution is differentiable. This assumption is used to derive the spatial derivatives...
Flux density measurements of a complete sample of faint blazars
fl ux density spectral index polarisation – galaxies quasars BL Lacs radio continuum galaxies
2011/10/18
We performed observations with the Effelsberg 100-m radio telescope to measure flux densities and polarised emission of sources selected from the "Deep X-ray Radio Blazar Survey" (DXRBS) to better def...
Constraints from the CMB temperature and other common observational data-sets on variable dark energy density models
Cosmology Dark energy Thermodynamics
2011/10/13
The thermodynamic and dynamical properties of a variable dark energy model with density scaling as rho_x \propto (1+z)^m, z being the redshift, are discussed following the outline of Jetzer et al. Thi...
The Turbulence Spectrum of Molecular Clouds in the Galactic Ring Survey: A Density-Dependent PCA Calibration
Turbulence Spectrum Molecular Clouds Galactic Ring Survey
2011/10/13
Turbulence plays a major role in the formation and evolution of molecular clouds. The problem is that turbulent velocities are convolved with the density of an observed region. To correct for this con...
An HI column density threshold for cold gas formation in the Galaxy
column density threshold cold gas formation Galaxy
2011/9/28
We report the discovery of a threshold in the HI column density of Galactic gas clouds below which the formation of the cold phase of HI is inhibited. This threshold is at $N_{HI} = 2 \times 10^{20}$ ...
Halo based reconstruction of the cosmic mass density field
galaxies: haloes – groups: general– cosmology: dark matter – large-scale structure of Universe – methods: numerical
2011/9/28
We present the implementation of a halo based method for the reconstruction of the cosmic mass density field. The method employs the mass density distribution of dark matter haloes and its environment...
Two Scenarios for the Formation of Cuspy Density Profiles in Elliptical Galaxies
Cuspy Density Profiles Elliptical Galaxies
2009/6/25
Two Scenarios for the Formation of Cuspy Density Profiles in Elliptical Galaxies。
Density gradients and internal dust in the Orion nebula
Density gradients internal dust Orion nebula
2009/6/11
Density gradients and internal dust in the Orion nebula。
Internal Variation of Electron Density in Galactic and Extragalactic HII Regions
Electron Density Extragalactic HII Regions Galactic
2009/6/10
Internal Variation of Electron Density in Galactic and Extragalactic HII Regions。
Large Scale Magnetic Fields：Density Power Spectrum in Redshift Space
Cosmology magnetic fields MHD
2009/5/19
We compute the density redshift-space power spectrum in
the presence of tangled magnetic fields and compare it with existing observations.
Our analysis shows that if these magnetic fields originated...
THERMAL PROCESSES AND SPIRAL DENSITY WAVES II. STABILITY OF THE GASEOUS DISC OF THE GALAXY
SPIRAL DENSITY WAVES II THE GALAXY GASEOUS DISC
2009/4/22
THERMAL PROCESSES AND SPIRAL DENSITY WAVES II. STABILITY OF THE GASEOUS DISC OF THE GALAXY。