Velocity coordinate spectrum: geometrical aspects of observations
arXiv:astro-ph/0611465
Abstract
We analyze a technique of obtaining turbulence power spectrum using spectral line data along the velocity coordinate, which we refer to as Velocity Coordinate Spectrum (VCS). We formalize geometrical aspects of observation through a single factor, "geometric term". We find that all variety of particular observational configurations can be described using correspondent variants of this term, which we explicitly calculate. This allows us to obtain asymptotics for both parallel lines of sight and crossing lines of sight. The latter case is especially important for studies of turbulence within diffuse ISM in Milky Way. For verification of our results, we use direct calculation of VCS spectra, while the numerical simulations are presented in a companion paper.
Cited by in corpus (5)
- Velocity Spectrum for HI at High Latitudes
- The Turbulence Velocity Power Spectrum of Neutral Hydrogen in the Small Magellanic Cloud
- Interstellar Sonic and Alfvénic Mach Numbers and the Tsallis Distribution
- Comment on Clark et al. (2019) "The Physical Nature of Neutral Hydrogen Intensity Structure"
- Line-of-sight statistical methods for turbulent medium: VCS for emission and absorption lines