Velocity Modification of HI Spectrum and Clouds in Velocity Space

Details Velocity Modification of HI Spectrum and Clouds in Velocity Space Velocity Modification of HI Spectrum and Clouds in Velocity Space

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.5102l&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #51.02; Bulletin of the American Astronomical Society, Vol. 31, p.1449

Statistics

Scientific paper

Emission in spectral lines can provide unique information on interstellar turbulence. Doppler shifts due to supersonic motions contain information on turbulent velocity field which is otherwise difficult to measure. However, the problem of separation of velocity and density fluctuations is far from being trivial. We use HI as a test case and calculate the emission spectrum in velocity slices of data. We derive the dependence of the emission spectrum on the statistics of velocity and density fields. We find that random velocity creates a lot of small scale structure that can erroneously be identified as clouds. We show that the shallow spectrum of intensity reported by observers may be a consequence of the velocity fluctuations with Kolmogorov-type spectrum. We calculate how the spectra vary with the change of velocity slice thickness and show that the observational 21 cm data is consistent with the explanation that the observed intensity fluctuations are generated by a turbulent velocity field. Our technique can be applied to studies of other emission lines.

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