187 citations · 717 across the 13 of their papers we have counts for
3 papers · 1 filter
Tracing the Cosmic Metal Evolution in the Low-Redshift Intergalactic Medium
J. Michael Shull, Charles. W. Danforth, Evan M. Tilton
Using the Cosmic Origins Spectrograph aboard the Hubble Space Telescope, we measured the abundances of six ions (C III, C IV, Si III, Si IV, N V, O VI) in the low-redshift (z < 0.4…
HST-COS Observations of AGN. II. Extended Survey of Ultraviolet Composite Spectra from 159 Active Galactic Nuclei
Matthew L. Stevans, J. Michael Shull, Charles W. Danforth +1
The ionizing fluxes from quasars and other active galactic nuclei (AGN) are critical for interpreting their emission-line spectra and for photoionizing and heating the intergalacti…
An HST/COS Survey of the Low-Redshift IGM. I. Survey, Methodology, & Overall Results
Charles W. Danforth, Brian A. Keeney, Evan M. Tilton +12
We use high-quality, medium-resolution {\it Hubble Space Telescope}/Cosmic Origins Spectrograph (\HST/COS) observations of 82 UV-bright AGN at redshifts to construct…