Small Scale Structures as Units of Dynamical Multi-Phase Interstellar Medium

Details Small Scale Structures as Units of Dynamical Multi-Phase Interstellar Medium Small Scale Structures as Units of Dynamical Multi-Phase Interstellar Medium

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944419t&link_type=abstract

American Astronomical Society, AAS Meeting #219, #444.19

Astronomy and Astrophysics

Astronomy

Scientific paper

In order to investigate origin of the interstellar turbulence, detailed observations in the CO J= 1--0 and 3--2 lines have been carried out in an interacting region of a molecular cloud with a HII region. As a result, a few 1000 to 10000 AU scale cloudlets with small velocity dispersion are detected, whose systemic velocity have relatively large scatter of a few km/s. It is suggested that cloud is composed of the small-scale dense and cold structures and their overlapping effect makes cloud appearing to be turbulent entity as a whole. This picture is strongly support the two-phase model of turbulent medium driven by thermal instability proposed previously. On the surface of present cloud, the turbulence is likely to be driven by thermal instability following ionization shock compression and UV irradiation. Those small scale structures with line width of 0.6 km/s have relatively high CO line ratio of J=3--2 to 1--0 as R3-2/1-0 > 1 compared to those with 0.3 km/s line width as R3-2/1-0 < 0.2. The LVG analysis implies that the 0.6 km/s component cloudlets have peak density of at least 104-6 cm-3, more than an order of magnitude larger than those of the 0.3 km/s component, while the kinetic temperature of the 0.3 km/s component is estimated to be less than 30 K.

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