The thinnest cold HI clouds in the diffuse interstellar medium?

Details The thinnest cold HI clouds in the diffuse interstellar medium? The thinnest cold HI clouds in the diffuse interstellar medium?

2005-05-05

arxiv.org/abs/astro-ph/0505106v2

Astronomy and Astrophysics

Astrophysics

small changes, accepted by ApJ

Scientific paper

10.1086/432533

We confirm and discuss recently discovered cold HI clouds with column densities among the lowest ever detected. The column densities of Cold Neutral Medium (CNM) towards 3C286 and 3C287 are ~10^18 cm^-2, below an observational lower limit, and also below tiny-scale-atomic clouds detected by VLBI and time-variable profiles against pulsars. These column densities are close to the minimum imposed by thermal evaporation. The fractions of the CNM to total HI towards 3C286 and 3C287 are ~4% and <2%, respectively. We discuss the CNM fraction and the CNM clouds in relation to several theoretical models.

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