Hot Cores and Cold Grains

Galaxies in a simulated Λ CDM Universe I : cold mode and hot cores

We study the formation of galaxies in a large volume (50h Mpc, 2 × 288 particles) cosmological simulation, evolved using the entropy and energy conserving smoothed particle hydrodynamics (SPH) code Gadget-2. Most of the baryonic mass in galaxies of all masses is originally acquired through filamentary “cold mode” accretion of gas that was never shock heated to its halo virial temperature, confi...

Galaxies in a simulated Lambda CDM Universe - I. Cold mode and hot cores

We study the formation of galaxies in a large volume (50h Mpc, 2 × 288 particles) cosmological simulation, evolved using the entropy and energy conserving smoothed particle hydrodynamics (SPH) code GADGET-2. Most of the baryonic mass in galaxies of all masses is originally acquired through filamentary “cold mode” accretion of gas that was never shock heated to its halo virial temperature, confi...

Cold and hot.

Sulphur chemistry and evolution in hot cores

We compare the results of our JCMT spectral line survey of molecular gas towards ultracompact Hii regions with the predictions of models of sulphur chemistry in hot cores. We investigate the range of evolutionary models that are consistent with the observed physical conditions and chemical abundances, and see to what extent it is possible to constrain core ages by comparing abundances with the ...

Physics and chemistry of hot molecular cores

Young massive star-forming regions are known to produce hot molecular gas cores (HMCs) with a rich chemistry. While this chemistry is interesting in itself, it also allows to investigate important physical parameters. I will present recent results obtained with high-angular-resolution interferometers disentangling the small-scale structure and complexity of various molecular gas components. Ear...