Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932005r&link_type=abstract
American Astronomical Society, AAS Meeting #219, #320.05
Astronomy and Astrophysics
Astronomy
Scientific paper
The interstellar medium is known to have significant structures over a wide range of scales. These structures are generally interpreted as the signature of turbulence in the ISM. Here we present the results from high resolution observation of HI absorption towards 3C138 and the estimated structure function of the tiny scale opacity fluctuations from the combined VLA, MERLIN and VLBA data. The structure function is well represented by a power law with power law index of 0.33 over 5 - 100 AU. The amplitude of the structure function suggests significantly higher opacity fluctuations at these scales than the expected value from the extrapolation of observations at larger scales. This indication of the presence of rich tiny scale structures may be used to constrain models of turbulent ISM.
Brogan Crystal L.
Chengalur Jayaram N.
Dutta Prasun
Goss William Miller
Lazio Joseph T. W.
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