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- W2094501939 abstract "We estimate the evaporation timescale for spherical H I clouds consisting of the cold neutral medium surrounded by the warm neutral medium. We focus on clouds smaller than 1 pc, which corresponds to tiny H I clouds recently discovered by Braun & Kanekar and Stanimirović & Heiles. By performing 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 of 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, and for clouds larger than about 0.1 pc it depends strongly on the pressure. In high-pressure cases, there exists 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 H I clouds exist ubiquitously, our analysis suggests two implications: tiny H I 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. The cloud-size dependence of the timescale is well explained by an analytic approximate formula derived by Nagashima, Koyama, & Inutsuka. We also compare it with the evaporation rate given by McKee & Cowie." @default.
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- W2094501939 date "2006-10-31" @default.
- W2094501939 modified "2023-10-18" @default.
- W2094501939 title "How Long Can Tiny H i Clouds Survive?" @default.
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- W2094501939 doi "https://doi.org/10.1086/509805" @default.
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