The Gas Producer for Heating Processes

Heating with Gas

Heating Cluster Gas

It is now generally agreed that some process prevents the diffuse gas in galaxy clusters from cooling significantly, although there is less agreement about the nature of this process. I suggest that cluster gas may be heated by a natural extension of the mechanism establishing the MBH − σ and MBH −Mbulge relations in galaxies, namely outflows resulting from super–Eddington accretion on to the g...

Gasification, Producer Gas and Syngas - FSA1051

Gasification involves turning organic fuels (such as biomass resources) into gaseous compounds (producer gas or syngas) by supplying less oxygen than is needed for com­ plete combustion of the fuel. Gasifica­ tion occurs at temperatures between 1112o and 2732o F and produces a lowto medium-energy gas depending upon the process type and operating conditions. Gasification of biomass resources is ...

Heating the Gas in Photodissociation Fronts

ISO has provided us with a new perspective on gas temperatures in photodissociation regions through measurements of line emission from rotationallyexcited levels of H2. The H2 rotational level populations provide a thermal probe, showing that gas temperatures Tgas ≈ 500 − 1000K prevail in a portion of the PDR where significant H2 is present. Such high gas temperatures were unexpected. Theoretic...

Evidence for the Heating of Atomic Interstellar Gas by PAHs

We report a strong correlation between the [CII] 158 μm cooling line and the mid-infrared flux in the 5-10 μm range in a wide variety of star-forming galaxies. The mid-infrared flux is dominated by Aromatic Feature Emission (AFE), which is thought to arise from large polycyclic aromatic hydrocarbon molecules or “PAHs” and is generally associated with the smallest interstellar grains. The [CII] ...