Mapping Low-Density Intergalactic Gas: a Third Helium Lyman-alpha Forest

Details Mapping Low-Density Intergalactic Gas: a Third Helium Lyman-alpha Forest Mapping Low-Density Intergalactic Gas: a Third Helium Lyman-alpha Forest

1998-08-11

arxiv.org/abs/astro-ph/9808105v2

Astron.J.117:56-62,1999

Astronomy and Astrophysics

Astrophysics

17 pages including 5 figures. As accepted for publication in The Astronomical Journal (minor revisions)

Scientific paper

10.1086/300698

We present a new HST/STIS spectrum of the z=3.18 quasar PKS 1935-692 and summarize the spectral features shortwards of 304A in the rest frame likely to be caused by foreground HeII Lyman-alpha absorption. In accord with previous results on two other quasars at similar redshifts, we demonstrate a correlation with the HI Lyman-alpha forest absorption, and show that much of the helium absorption is caused by a comparable quantity of more diffuse gas with Omega~0.01, that is not detected in HI. The helium ionization zone around the quasar is detected as well as a void seen in both HI and HeII. The properties of the absorption are in broad agreement with those of the other quasars and with models of the protogalactic gas distribution and ionization at this redshift.

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