The authors show that intensity gradients from thick velocity channel maps trace magnetic fields, shocks, and self-gravitating regions in diffuse interstellar gas, though with lower accuracy than velocity gradients.
Velocity coordinate spectrum: geometrical aspects of observations
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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.
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astro-ph.GA 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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Intensity Gradients Technique: Synergy with Velocity Gradients and Polarization Studies
The authors show that intensity gradients from thick velocity channel maps trace magnetic fields, shocks, and self-gravitating regions in diffuse interstellar gas, though with lower accuracy than velocity gradients.