Evaporation Timescales of HI Clouds

Details Evaporation Timescales of HI Clouds Evaporation Timescales of HI Clouds

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..365..121n&link_type=abstract

SINS - Small Ionized and Neutral Structures in the Diffuse Interstellar Medium ASP Conference Series, Vol. 365, Proceedings of t

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We estimate the evaporation timescale for spherical HI clouds consisting of the cold neutral medium surrounded by the warm neutral medium, with special attention to the recently discovered tiny H I clouds. Utilizing one-dimensional spherically symmetric numerical simulations of the two-phase interstellar medium (ISM), we derive the timescales as a function of the cloud size and pressure of the ambient warm medium. We find that the evaporation timescale of the clouds of 0.01 pc is about 1 Myr with standard ISM pressure, p/kB˜ 103.5 K cm-3; for clouds larger than about 0.1 pc, the lifetime depends strongly on the pressure. In high pressure cases, there is a critical radius for clouds growing as a function of pressure, but the minimum critical size is ˜ 0.03 pc for a standard environment. If tiny HI clouds exist ubiquitously, our analysis suggests two implications: tiny HI clouds are formed continuously with the timescale of 1 Myr, or the ambient pressure around the clouds is much higher than the standard ISM pressure.

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