Astronomy & Astrophysics Seminar: [C II] Emission in a Self-regulated ISM

Zoom: https://tau-ac-il.zoom.us/j/87230679135?pwd=Y1duRlArUkJwSnhaaXVscUU0azY3Zz09

Abstract:

The [CII] 157.74 μm fine structure transition is one of the brightest and most well-studied emission lines in the far-infrared, produced in the interstellar medium (ISM) of galaxies. We study its properties in sub-pc resolution hydrodynamical simulations for an ISM patch, coupled with time-dependent chemistry, far-ultraviolet dust and gas shielding, star formation, photoionization and supernova feedback, and full line-radiative transfer. We find a [CII]-to-H2 conversion factor that is almost constant with metallicity, and a [CII]-SFR relation that scales linearly with metallicity. The majority of [CII] originates from atomic gas with hydrogen number density n∼10 cm−3. Our findings are consistent with z∼0 observations. As such, [CII] is a good SFR tracer even in metal-poor environments where molecular lines might be undetectable. Resolving the clumpy structure of the dense (n=10−1000 cm^{-3}) ISM is important as it dominates [CII] 157.74 μm emission.

Seminar Organizer: Dr. Jonathan Stern

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