Assigned ID: 94 ----- Attempting Submission 1 (Wed Mar 05 21:19:23 GMT 2008) ----- We plan to study turbulence in the diffuse interstellar medium (ISM) by analyzing the shapes of absorption features arising from various atomic species that appear in the archival UV spectra of 102 early-type stars in the Milky Way, recorded by the higest resolution mode (E140H) of the STIS spectrograph. Our objective is to consider 12 different lines that cover a wide range of line strengths, so that we can piece them together to create a composite velocity profile over a large span in equivalent hydrogen column densities. We intend to study separately neutral, singly-ionized and doubly ionized atoms. The statistical properties of the velocity distribution functions should yield insights on the dynamical effects arising from turbulence in the ISM and, moreover, allow comparisons to be made with the predictions from theoretical models arising numerical simulations of turbulence created by different investigators. We plan to use a specific analysis approach called the Velocity Coordinate Spectrum developed by Lazarian and Pogosyan to interpret the data.

ISM AND CIRCUMSTELLAR MATTER 12 114896 Budget should be split over 2 years false 0.0 0.0 false false false false false SUPPORTED