Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21833203m&link_type=abstract
American Astronomical Society, AAS Meeting #218, #332.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Despite the increasing numbers of O VI absorbers observed, the ionization mechanisms of these systems is still not well understood. Both photo and collisional ionization seem to play roles in the ionization of the gas in these systems. In order to place constraints on the baryon fractions as traced by O VI absorbers, the ionization mechanisms must be well understood. Part of the confusion is due to the lack of adjacent ionization states of ions in existing spectra. We present new observations with the COS spectrograph of several absorbers at z>0.4 that have O II, OIII, OIV, and OVI absorption lines. With these adjacent ionization stages we can much more tightly constrain the physical conditions in the gas. Here, we present voigt profile fits to these lines, as well as the results of photo and collisional ionization modeling.
Howk Christopher
Lehner Nicholas
Meiring Joe
Prochaska Jason
Thom Chris
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