Diffuse neutral interstellar medium: Results and surprises from H I studies
Astronomy and astrophysics
Friday 16 May 2014
to 11:30 at
Nirupam Roy (MpfIR)
The interstellar medium is known to have significant density and velocity structures over a wide range of spatial scales. These structures are generally interpreted as the signature of turbulence in the ISM. In this presentation, I will show some recent results, derived from observations of the Galactic HI, probing the ISM turbulence from parsec to AU scale using several complimentary techniques. In this context, I will discuss, from an observer's point of view, the need of characterizing the nature of the interstellar turbulence to constrain the temperature of the diffuse neutral ISM. Correctly estimating the temperature of the turbulent multiphase ISM is an important issue, particularly in light of the recent observational results that a significant fraction of the gas is in the thermally unstable phase, and that the standard thermal equilibrium model may not be entirely correct.