Global FUSE Observations of O VI Absorption in the Large Magellanic Cloud

Details Global FUSE Observations of O VI Absorption in the Large Magellanic Cloud Global FUSE Observations of O VI Absorption in the Large Magellanic Cloud

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344402b&link_type=abstract

American Astronomical Society, AAS Meeting #213, #444.02; Bulletin of the American Astronomical Society, Vol. 41, p.326

Astronomy and Astrophysics

Astronomy

Scientific paper

We have embarked on a project to characterize the global properties of O VI absorption toward stars in the Large Magellanic Cloud observed with FUSE. Earlier studies with a smaller sample established that O VI absorption is widespread and spatially variable. However, at least one study has claimed that localized enhancements in O VI column density may be associated with nebular sub-structures. It is the aim of our program to perform a broader analysis of O VI absorption characteristics using all of he available data. O VI ISM absorption in LMC stellar spectra varies widely, depending on the stellar spectral type as well as the presence or absence of galactic or intermediate velocity absorption. Hence, we have performed a spectral morphology classification of the FUSE data for each sight line. A new aspect of our analysis is to include sight lines with little or no LMC ISM O VI. Without including such sight lines, the dispersion of LMC O VI absorption (attributed to the halo of the LMC) has been underestimated, and the average value has been overestimated. We are using these data to study large scale O VI distribution patterns and assess whether excess O VI absorption can be attributed to nebular sub-structures within the LMC. Because the scale of the project is quite large and ongoing, we will report our preliminary findings.
This project has been funded through a NASA FUSE Cycle 5 Legacy grant NNG05GE03G to The Johns Hopkins University.

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