Interstellar Thermal Pressures from C I Fine-structure Excitation

Details Interstellar Thermal Pressures from C I Fine-structure Excitation Interstellar Thermal Pressures from C I Fine-structure Excitation

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9534j&link_type=abstract

HST Proposal ID #9534

Physics

Hst Proposal Id #9534 Ism And Circumstellar

Scientific paper

We propose to analyze absorption features of interstellar C I in the STIS E140H spectra of about 60 early-type stars in the disk of the Galaxy, using chiefly the archival data produced by the Cycle 8 SNAP program of Lauroesch {to study ISM abundances}. Our objective will be to expand on what we have recently learned about the distribution of interstellar thermal pressures from a survey of the relative populations of C I in excited fine-structure states toward 21 stars {Jenkins & Tripp 2001}. We plan to invoke a very efficient, special analysis technique developed in the earlier study to unravel the blended features in different multiplets, a method that allows us to bypass time-consuming, iterative profile fitting procedures. Most of the earlier targets were confined to the CVZ, which limited the coverage of Galactic longitudes. The new archival survey will give more even coverage of the sky {and quadruple the number of sight lines}, and it will allow us to investigate a broader range of circumstances for interesting phenomena we uncovered earlier, such as the link of pressure enhancements to the gas kinematics and the discovery of ubiquitous, small fractions of gas at extreme pressures {our interpretation is that they are probably produced by collisions of turbulent flows}.

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