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Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5894w&link_type=abstract
HST Proposal ID #5894
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Hst Proposal Id #5894 Interstellar Medium
Scientific paper
We request observing time with the GHRS on HST to help determine the structure and physical parameters of the hot gaseous halo of the Large Magellanic Cloud (LMC). The SMC and LMC are the only galaxies in which such a determination can be done in detail, as confusion along the line-of-sight is much less than in the Milky Way. They are also the only other galaxies near enough to be able to obtain high-resolution spectra of individual stars. Gas at 10^5 K can be detected in the C IV LambdaLambda1548, 1550 UV absorption lines. From such data it is also possible to obtain information on velocities and the depth structure of the halo. Previous work with IUE has shown that 10^5 K gas is present around very hot stars, in some H II regions, in superbubbles and in supergiant shells. However, with IUE it is not possible to determine the existence of a continuous halo surrounding the LMC, since the required probes are too faint. We request observing time for eight probes selected to take into account the distribution 10^6 K gas mapped by ROSAT, while avoiding areas known to produce 10^5 K gas locally. We request a total of ten orbits and plan to use the G160M grating of GHRS, which allows us to reach a signal-to-noise ratio of 20 or higher. This corresponds to a detection limit for N(C IV) of 2x10^13 , within the range of values detected in the Milky Way.
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