Effect of turbulent velocity on the \HI intensity fluctuation power spectrum from spiral galaxies
arXiv:1504.06252 · doi:10.1093/mnras/stv1294
Abstract
We use numerical simulations to investigate effect of turbulent velocity on the power spectrum of \HI intensity from external galaxies when (a) all emission is considered, (b) emission with velocity range smaller than the turbulent velocity dispersion is considered. We found that for case (a) the intensity fluctuation depends directly only on the power spectrum of the column density, whereas for case (b) it depends only on the turbulent velocity fluctuation. We discuss the implications of this result in real observations of \HI fluctuations.
arXiv comment13 pages, 4 figures, Submitted to MNRAS Letters
References in corpus (18)
- THINGS: The HI Nearby Galaxy Survey
- Interstellar Turbulence I: Observations and Processes
- The Neutral Atomic Phases of the ISM in the Galaxy
- High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
- Velocity Modification of HI Power Spectrum
- What is Driving the HI Velocity Dispersion?
- Velocity Spectrum for HI at High Latitudes
- A New Method to Measure and Map the Gas Scale-Height of Disk Galaxies
- A Study of ISM of Dwarf Galaxies Using HI Power Spectrum Analysis
- Power spectrum of HI intensity fluctuations in DDO 210
- Turbulence Spectra from Spectral Lines: Tests of the Velocity Channel Analysis and Velocity Coordinate Spectrum Techniques
- An HI column density threshold for cold gas formation in the Galaxy
- Interpretation of the Spatial Power Spectra of Neutral Hydrogen in the Galaxy and in the Small Magellanic Cloud
- The Scale Height of NGC 1058 Measured from its HI Power Spectrum
- HI power spectrum of the spiral galaxy NGC628
- Topology of Neutral Hydrogen Within the Small Magellanic Cloud
- Probing interstellar turbulence in spiral galaxies using HI power spectrum analysis
- The \HI column density power spectrum of six nearby spiral galaxies