Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348610z&link_type=abstract
American Astronomical Society, AAS Meeting #213, #486.10; Bulletin of the American Astronomical Society, Vol. 41, p.460
Astronomy and Astrophysics
Astronomy
Scientific paper
Absorption from high ions (Si IV, C IV, and N V) is used to probe hot gas from the Milky Way to high-redshift primordial galaxies. However, only in our own Galaxy have they been observed with high enough spectral resolution to fully resolve the line profiles. We present an homogeneous study of the high-resolution STIS E140H (1.5-2.7 km/s resolution) spectra of the interstellar Si IV, C IV, and N V absorption along 50 Galactic sight lines. These data are complemented by FUSE O VI for all but 4 stars. The sight lines chosen for study in this work sample a variety of physical environments or structures (e.g., the lower Galactic halo, HI shells and supershells, spiral arm and interarm gas, and evolved supernova remnants). The very high resolution of the observations allows us to derive properties for the individual physical clouds connected to such structures and to study effects unobservable at lower resolutions where the clouds are smeared together. We discuss the ionization mechanism(s) responsible for the highly ionized gas in different physical environments and search for systematic trends.
Howk Christopher
Lehner Nicholas
Zech William
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