Physics – Atomic Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12125f&link_type=abstract
HST Proposal ID #12125. Cycle 18
Physics
Atomic Physics
Scientific paper
The installation of COS and the refurbishment of STIS bring significant UV/Optical spectroscopic capabilities back to HST. Their science drivers include fundamental questions about the intergalactic medium, star birth, and the formation of cosmic structure. The gas producing the UV/Optical spectrum is seldom in equilibrium and numerical simulations are required to understand the observations. I am requesting support for the expansion of the plasma code Cloudy, which has come into widespread community use as a way to understand such spectra, to meet the challenges posed by these instruments. Cloudy predicts the full ionic and molecular spectrum over the COS/STIS passbands. The first step is a major update to the part of CloudyÕs atomic/molecular database covering this spectral range. Recent development had emphasized the IR and X-Ray and this passband had not been a priority. Next, Cloudy is often used by large-scale structure or dynamics codes as an atomic physics server. The second step is to develop an interface to facilitate access to the basic atomic data and CloudyÕs atomic physics solvers. These infrastructure developments will facilitate the broad range of investigations made possible by this new HST instrumentation.;
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