VELOCITY SPECTRUM FOR H I AT HIGH LATITUDES

Journal Article · Mon May 10 04:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/714/2/1398· OSTI ID:21448815

Chepurnov, A; Lazarian, A; Stanimirovic, S ^[1]; Heiles, Carl; Peek, J E. G. ^[2]

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1. Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706 (United States)
2. Department of Astronomy, University of California, Berkeley, CA 94720 (United States)

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{sup 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.

• OSTI ID: 21448815
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 714; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANTENNAS
ASYMPTOTIC SOLUTIONS
COORDINATES
DATA ANALYSIS
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
GALAXIES
MATHEMATICAL SOLUTIONS
MATHEMATICS
MILKY WAY
RADIO EQUIPMENT
RADIO TELESCOPES
SPECTRA
STATISTICS
TELESCOPES
TURBULENCE