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The Dispersion of Fast Radio Bursts from a Structured Intergalactic Medium at Redshifts z < 1.5
J. Michael Shull, Charles W. Danforth
We analyze the sources of free electrons that produce the large dispersion measures, DM (in units cm pc), observed toward fast radio bursts (FRBs). Indivi…
An Ultraviolet Survey of Low-Redshift Partial Lyman-Limit Systems with the HST Cosmic Origins Spectrograph
J. Michael Shull, Charles W. Danforth, Evan M. Tilton +2
We present an ultraviolet spectroscopic survey of strong H I absorbers in the intergalactic medium, probing their evolution over the last 6-7 Gyr at redshifts $0.24 \leq z \leq 0.8…
Agnostic Stacking of Intergalactic Doublet Absorption: Measuring the NeVIII Population
Stephan Frank, Matthew M. Pieri, Smita Mathur +2
We present a blind search for doublet intergalactic metal absorption with a method dubbed `agnostic stacking'. Using a forward-modelling framework we combine this with direct detec…
The Spread of Metals into the Low-Redshift Intergalactic Medium
C. T. Pratt, J. T. Stocke, B. A. Keeney +1
We investigate the association between galaxies and metal-enriched and metal-deficient absorbers in the local universe () using a large compilation of FUV spectra of brig…
Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-Line Spectroscopy: II. Methods and Models
Brian A. Keeney, John T. Stocke, Charles W. Danforth +6
We present basic data and modeling for a survey of the cool, photo-ionized Circum-Galactic Medium (CGM) of low-redshift galaxies using far-UV QSO absorption line probes. This surve…
The Warm Circum-Galactic Medium: 10^5-6 K Gas Associated with a Single Galaxy Halo or with an Entire Group of Galaxies?
John Stocke, Brian Keeney, Charles Danforth +3
In preparation for a Hubble Space Telescope (HST) observing project using the Cosmic Origins Spectrograph (COS), the positions of all AGN targets having high-S/N far-UV G130M spect…