Zobrazeno 1 - 10
of 417
pro vyhledávání: '"Pogosyan, D"'
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 suggest that the
Externí odkaz:
http://arxiv.org/abs/2306.10005
Magnetic turbulence is anisotropic as the directions of motion are constrained by the magnetic field. Such anisotropy can be observed in velocity centroids obtained from spectroscopic observations. We use magnetohydrodynamics (MHD) simulations to pro
Externí odkaz:
http://arxiv.org/abs/2008.05393
A recent publication by Clark et.al (2019, CX19) uses both GALFA-HI observational data and numerical simulations to address the nature of intensity fluctuations in Position-Position-Velocity (PPV) space. The study questions the validity and applicabi
Externí odkaz:
http://arxiv.org/abs/1904.03173
Autor:
Junaid, M., Pogosyan, D.
Publikováno v:
Phys. Rev. D 98, 023519 (2018)
In this work we effectively calculated the two-dimensional Minkowski functionals for cosmic microwave background (CMB) temperature maps generated by single field models of inflation with a standard kinetic term. We started with calculation of the bis
Externí odkaz:
http://arxiv.org/abs/1806.04534
Recent Planck observations have revealed some of the important statistical properties of synchrotron and dust polarisation, namely, the $B$ to $E$ mode power and temperature-$E$ (TE) mode cross-correlation. In this paper, we extend our analysis in Ka
Externí odkaz:
http://arxiv.org/abs/1711.03161
Autor:
Kraljic, K., Arnouts, S., Pichon, C., Laigle, C., de la Torre, S., Vibert, D., Cadiou, C., Dubois, Y., Treyer, M., Schimd, C., Codis, S., de Lapparent, V., Devriendt, J., Hwang, H. S., Borgne, D. Le, Malavasi, N., Milliard, B., Musso, M., Pogosyan, D., Alpaslan, M., Bland-Hawthorn, J., Wright, A. H.
Publikováno v:
MNRAS 474 (2018) 1, 547-571
The role of the cosmic web in shaping galaxy properties is investigated in the GAMA spectroscopic survey in the redshift range $0.03 \leq z \leq 0.25$. The stellar mass, $u - r$ dust corrected colour and specific star formation rate (sSFR) of galaxie
Externí odkaz:
http://arxiv.org/abs/1710.02676
Recent Planck observations of dust polarization in the Galaxy have revealed that the power in $E$ mode is twice that in $B$ mode. Caldwell et. al. have formulated a theoretical model in the context of magnetohydrodynamic (MHD) turbulence and found it
Externí odkaz:
http://arxiv.org/abs/1707.06276
Publikováno v:
MNRAS 470, 3103-3123 (2017)
We study the effect of dust absorption on the recovery velocity and density spectra as well as on the anisotropies of magnetohydrodynamic turbulence using the Velocity Channel Analysis (VCA), Velocity Coordinate Spectrum (VCS) and Velocity Centroids.
Externí odkaz:
http://arxiv.org/abs/1703.05368
We study possibility of obtaining velocity spectra by studying turbulence in an optically thick medium using velocity centroids (VCs).We find that the regime of universal, i.e. independent of underlying turbulence statistics, fluctuations discovered
Externí odkaz:
http://arxiv.org/abs/1607.04316
Autor:
Uhlemann, C., Codis, S., Kim, J., Pichon, C., Bernardeau, F., Pogosyan, D., Park, C., L'Huillier, B.
Publikováno v:
Mon Not R Astron Soc (2017) 466 (2): 2067-2084
Simple parameter-free analytic bias functions for the two-point correlation of densities in spheres at large separation are presented. These bias functions generalize the so-called Kaiser bias to the mildly non-linear regime for arbitrary density con
Externí odkaz:
http://arxiv.org/abs/1607.01026