2006/11/30 by A. Chepurnov, A. V. Chepurnov, A. Lazarian +5 · 5 citations
Mathematics · Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Computational physics #Galaxies: Formation, Evolution, Phenomena #Geometry #Latitude #Line (geometry) #Mathematics #Meteorology #Physics #Smoothing #Spectral index #Spectral line #Statistics #Stellar, planetary, and galactic studies #Turbulence #astro-ph
paper · pdf · doi:10.1088/0004-637x/714/2/1398
published as Astrophys.J.714:1398-1406,2010 · Accepted to ApJ
arxiv created 2010/02/11 · openalex publication_date 2010/04/20 · arxiv updated 2014/10/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In this paper, we present the results of the statistical analysis of high-latitude H i turbulence in the Milky Way. We have observed H i in the 21 cm line, obtained with the Arecibo 3 L-Band Feed Array receiver at the Arecibo radio telescope. For recovering velocity statistics, we have used the velocity coordinate spectrum (VCS) technique. In our analysis, we have used direct fitting of the VCS model, as its asymptotic regimes are questionable for Arecibo's resolution, given the restrictions from thermal smoothing of the turbulent line. We have obtained a velocity spectral index of 3.87 ± 0.11, an injection scale of 140 ± 80 pc, and an H i cold phase temperature of 52 ± 11 K. The spectral index is steeper than the Kolmogorov index and can be interpreted as being due to shock-dominated turbulence.