Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5734c&link_type=abstract
HST Proposal ID #5734
Physics
Hst Proposal Id #5734 Interstellar Medium Absorption Lines
Scientific paper
Supershells are gigantic bubbles of hot gas blown in galactic disks by stellar winds and supernovae. Providing an enormous energy input to the ISM, they have an important effect on local dynamics and on galactic halos. One of them, LMC2 in the Large Magellanic Cloud, has been well studied at radio, optical and X-ray wavelengths. We have shown its optical filaments to be expanding in LMC disk gas. Our recent ROSAT observations reveal that the diffuse X-ray emission covers a larger sky area than the optical filaments do. Did LMC2 burst open in the halo?. What is the dynamics of the optically invisible IS gas layers within and around LMC2?. To probe the IS gas of LMC2, we propose to obtain GHRS medium resolution UV spectra of 7 supergiant stars in the LMC2 field. The observational goal is to measure the velocities and strengths of UV IS absorption lines arising in the cold, warm and hot LMC2 gas. HST has the only existing UV spectrograph that can detect individual velocity components of IS hot gas (CIV and NV absorption) in connection with the X-ray diffuse emission seen towards the LMC supershells. The scientific goals are to find a satisfactory model of LMC2 that describes the physical characteristics of the superbubble and the effects of supershell expansion or break-out into the LMC halo.
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