Zobrazeno 1 - 10
of 378
pro vyhledávání: '"Fang, Li Zhi"'
Publikováno v:
ApJ, 777, 48 (2013)
We use a suite of cosmological hydrodynamic simulations, run by two fixed grid codes, to investigate the properties of solenoidal and dilatational motions of the intergalactic medium (IGM), and the impact of numerical viscosity on turbulence in a LCD
Externí odkaz:
http://arxiv.org/abs/1308.4654
With Monte Carlo simulation method, we investigate the time dependent behavior of Ly$\alpha$ photon transfer in optically thick medium of the concordance $\Lambda$CDM universe. At high redshift, the Ly$\alpha$ photon escaping from optically thick med
Externí odkaz:
http://arxiv.org/abs/1108.4162
We investigate the effects of dust on Ly{\alpha} photons emergent from an optically thick medium by solving the integro-differential equation of the radiative transfer of resonant photons. To solve the differential equations numerically we use the We
Externí odkaz:
http://arxiv.org/abs/1107.1804
We investigate the possibility of detecting the turbulent state of the IGM with the kinetic Sunyaev-Zel'dovich (kSZ) effect. Being sensitive to the divergence-free component of the momentum field of the IGM, the kSZ effect might be used to probe the
Externí odkaz:
http://arxiv.org/abs/1105.1203
Autor:
Fang, Li-Zhi, Zhu, Weishan
The mean mass densities of cosmic dark matter is larger than that of baryonic matter by a factor of about 5 in the $\Lambda$CDM universe. Therefore, the gravity on large scales should be dominant by the distribution of dark matter in the universe. Ho
Externí odkaz:
http://arxiv.org/abs/1008.1449
We investigate the non-Gaussian features of the IGM at redshift $z\sim 5 - 6$ using Ly$\alpha$ transmitted flux of quasar absorption spectra and cosmological hydrodynamic simulation of the concordance $\Lambda$CDM universe. We show that the neutral h
Externí odkaz:
http://arxiv.org/abs/1006.1933
With a state-of-the-art numerical method for solving the integral-differential equation of radiative transfer, we investigate the flux of the Ly$\alpha$ photon $\nu_0$ emergent from an optically thick halo containing a central light source. Our focus
Externí odkaz:
http://arxiv.org/abs/1005.0338
Publikováno v:
W.S. Zhu et al ApJ 712(2010) 1-13
We investigate the vorticity of the IGM velocity field on large scales with cosmological hydrodynamic simulation of the concordance model of LCDM. We show that the vorticity field is significantly increasing with time as it can effectively be generat
Externí odkaz:
http://arxiv.org/abs/1001.4127
Autor:
Cao, Liang, Fang, Li-Zhi
Publikováno v:
Astrophys.J.706:1545-1555,2009
We develop an algorithm of separating the $E$ and $B$ modes of the CMB polarization from the noisy and discretized maps of Stokes parameter $Q$ and $U$ in a finite area. A key step of the algorithm is to take a wavelet-Galerkin discretization of the
Externí odkaz:
http://arxiv.org/abs/0910.4697
We develop a numerical solver for the integral-differential equations, which describes the radiative transfer of photon distribution in the frequency space with resonant scattering of Lyalpha photons by hydrogen gas in the early universe. The time-de
Externí odkaz:
http://arxiv.org/abs/0901.2171