Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1507h&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #15.07; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We present observations of the high ions C IV, Si IV, N V, O VI toward four hot stars in the Large Magellanic Cloud (LMC). High-quality FUSE and HST/STIS spectra of these stars, located toward superbubbles and HII regions, show absorption from the high ions and strong low-ionization lines over the velocity range [-50,+350] km/s. In the LMC (v>+175 km/s), we find narrow and broad C IV and Si IV absorption, but only very broad O VI absorption. The breadth of the narrow LMC components of C IV and Si IV implies very cool temperatures of a few times 10,000 K or less. The properties of these narrow components can be explained if they arise within the interstellar environments associated with the stars. The breadths of the broad LMC components imply hot, collisionally ionized gas at temperatures of a few times 100,000 K. We find a striking similarity in the O VI/C IV ratios for the broad LMC and HVC components; this suggests much of the material at v>+100 km/s is associated with the LMC. While there are differences in the high-ion ratios of the broad LMC and HVC components between the four sight lines, implying different processes or varying conditions are present, the stellar environments do not appear to dictate the production of the high ions in these components. Conductive interface models can reproduce the high-ion ratios of the broad LMC and HVC components; such models are also favored by the apparent kinematically coupling between the high and the weak ions. Our analysis is consistent with the existence of a hot LMC halo fed by energetic outflows from the LMC disk and even possibly with a galactic wind, since the velocity of the HVC relative to the LMC disk is actually large enough to escape altogether the LMC.
Howk Chris J.
Lehner Nicholas
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