Grants and Contracts Details
Description
Starburst galaxies and Active Galactic Nuclei are among the most luminous objects in the universe,
nd so can be seen over a broad range of distance and lookback time. The observed spectrum
Ireveals the chemical composition, mass, and luminosity of the central source, allowing their use as a
racer of early galactic evolution. Frequently the sources are hidden behind a veil of obscuring dust,
nd only hard X-rays, infrared, and radio radiation can be observed. The emitting region is often the
uter layer of a molecular cloud that is heated and ionized by an energetic continuum produced
ither by a star cluster or massive black hole. A photoevaporative now is established with an H II
region, POR, and molecular core forming successive layers. A vast number of ionic, atomic, and
molecular emission lines, together with a thermal dust continuum, are emitted, and can be used to
understand conditions within the source.
'his project represents a holistic approach to understanding the message contarned in the spectrum.
'he emitting regions are in a non-equilibrium state - the physical conditions are set by a large
I
number of microphysical processes. We are expanding the plasma simulation code Cloudy to do the
spectral formation problems associated with such sources on the coherent and self-consistent basis,
Magnetohydrodynamics provides the physical link between the now from molecular to ionized
Iregions. The gas and dust emission is set by the interactions between grains, the gas, and the
lincident radiation field, and the entire spectral radiative transfer problem must be solved. With our
previous ATP award we expanded the simulations to include weak-D and weak-R ionization fronts,
predicted the emission from size-resolved grain populations, included a full chemistry network, and
improved predictions of molecular, atomic, and ionic emission. Here we propose expanding the
physics to do divergent strong-D and strong-R fronts, time dependence, shocks, and improve the
rain molecular physics. Cloudy IS openly available and used to produce roughly 100 papers per
ear, insuring that the results produced by this proposal will have broad application.
Status | Finished |
---|---|
Effective start/end date | 3/15/05 → 3/14/08 |
Funding
- Goddard Space Flight Center: $236,514.00
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