1 citations · 1 across the 1 of their papers we have counts for
11 papers
He II Reionization and Sources of Metagalactic Ionization
J. Michael Shull
Intergalactic Ly-alpha opacity suggests that H I was reionized at z ~ 6, while He II reionization was delayed to z ~ 3. Both epochs are in conflict with inferences from CMB optical…
The Baryon Content of the Local Intergalactic Medium
John T. Stocke, J. Michael Shull, Steven V. Penton
We describe our surveys of low column density Lyman-alpha absorbers [N(HI) = 10^(12.5-16.0) cm^-2], which show that the warm photoionized IGM contains 30% of all baryons at z < 0.1…
FUSE Spectroscopy of High Velocity Cloud Complex C
E. M. Murphy, K. R. Sembach, B. K. Gibson +7
We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of the sightline toward the Seyfert 1 galaxy Markarian 876, which passes through high velocity cloud (HVC) com…
FUSE Observations of O VI Absorption in the Galactic Halo
B. D. Savage, K. R. Sembach, E. B. Jenkins +10
Far-ultraviolet spectra of 11 AGNs observed by FUSE are analyzed to obtain measures of O VI 1031.93 A absorption occurring over very long paths through Milky Way halo gas. Strong O…
FUSE Observations of Diffuse Interstellar Molecular Hydrogen
J. M. Shull, J. Tumlinson, E. B. Jenkins +11
We describe a moderate-resolution FUSE mini-survey of H2 in the Milky Way and Magellanic Clouds, using four hot stars and four AGN as background sources. FUSE spectra of nearly eve…
FUSE Observations of O VI in High Velocity Clouds
K. R. Sembach, B. D. Savage, J. M. Shull +13
We have used moderate-resolution (FWHM ~ 25 km/sec) spectra of AGNs and QSOs observed by the Far Ultraviolet Spectroscopic Explorer (FUSE) to make the first definitive measurements…