Intergalactic space is filled with a pervasive medium of ionized gas, the intergalactic medium
(IGM). A residual neutral fraction is detected in the spectra of quasistellar objects at both low …

At low redshift, only about one-tenth of the known baryons lie in galaxies or the hot gas seen
in galaxy clusters and groups. Models posit that these “missing baryons” are in gaseous …

Although galaxies, groups, and clusters contain∼ 10% of the baryons, many more reside in
the photoionized and shocked-heated intergalactic medium (IGM) and in the circumgalactic …

ABSTRACT The Cosmic Origins Spectrograph (COS) is a moderate-resolution spectrograph
with unprecedented sensitivity that was installed into the Hubble Space Telescope (HST) in …

We analyze the association of galaxies with Lyα and O vi absorption, the most commonly
detected transitions of the low-z intergalactic medium (IGM), in the fields of 14 quasars with z …

This paper presents a systematic study of the photoionization and thermodynamic properties
of the cool circumgalactic medium (CGM) as traced by rest-frame ultraviolet absorption lines …

We use high-quality, medium-resolution Hubble Space Telescope/Cosmic Origins
Spectrograph (HST/COS) observations of 82 UV-bright active galactic nuclei (AGNs) at …

We present new computations of the equilibrium and nonequilibrium cooling efficiencies
and ionization states for low-density radiatively cooling gas containing the elements H, He …

Any successful model of galaxy formation needs to explain the low rate of star formation in
the small progenitors of today's galaxies. This inefficiency is necessary for reproducing the …

We present new synthesis models of the extragalactic background light (EBL) from far infra-
red (FIR) to TeV γ-rays, with an emphasis on the extreme ultraviolet (UV) background that is …