Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-07-31
Astronomy and Astrophysics
Astrophysics
20 pages with 8 figures, LaTeX. Accepted by Ap. J. (scheduled for ApJ Vol. 561 num. 2, November 10, 2001)
Scientific paper
10.1086/323409
Using data from the Southern Galactic Plane Survey we have measured the spatial power spectrum of the interstellar neutral atomic hydrogen in the fourth Galactic quadrant. This function shows the same power law behavior that has been found for H I in the second quadrant of the Milky Way and in the Magellanic Clouds, with the same slope. When we average over velocity intervals broader than the typical small-scale velocity dispersion, we find that the slope steepens, from approx. -3 to -4 for the warm gas, as predicted by theories of interstellar turbulence if the column density fluctuations are dominated by variations in the gas density on small spatial scales. The cool gas shows a different increase of slope, that suggests that it is in the regime of turbulence dominated by fluctuations in the velocity field. Overall, these results confirm that the small scale structure and motions in the neutral atomic medium are well described by a turbulent cascade of kinetic energy.
Dickey John M.
Gaensler Bryan M.
Green Andrew J.
McClure-Griffiths Naomi M.
Stanimirovic Snezana
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