Toward a Better Understanding of ISM Turbulence through the Study of Velocity Profiles over a Large Dynamic Range

Details Toward a Better Understanding of ISM Turbulence through the Study of Velocity Profiles over a Large Dynamic Range Toward a Better Understanding of ISM Turbulence through the Study of Velocity Profiles over a Large Dynamic Range

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11757j&link_type=abstract

HST Proposal ID #11757. Cycle 17

Computer Science

Scientific paper

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.;

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