期刊
ASTROPHYSICAL JOURNAL
卷 693, 期 2, 页码 1074-1083出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/693/2/1074
关键词
ISM: lines and bands; methods: data analysis; techniques: spectroscopic; turbulence
资金
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0808118] Funding Source: National Science Foundation
Turbulent motions induce Doppler shifts of observable emission and absorption lines motivating studies of turbulence using precision spectroscopy. We provide numerical testing of the two most promising techniques, velocity channel analysis and velocity coordinate spectrum (VCS). We obtain an expression for the shot noise that the discretization of the numerical data entails and successfully test it. We show that the numerical resolution required for recovering the underlying turbulent spectrum from observations depend on the spectral index of velocity fluctuations, which makes low-resolution testing misleading. We demonstrate numerically that, when dealing with absorption lines, sampling of turbulence along just a dozen directions provides a high quality spectrum with the VCS technique.
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