Dating individual quasars with the He II proximity effect
Early and Extended Helium Reionization over More Than 600 Million Years of Cosmic Time
Evidence for short ~ 1 Myr lifetimes from the He II proximity zones of z ~ 4 quasars
He II Lyb Gunn-Peterson Absorption: New HST Observations and Theoretical Expectations
Helium Reionization Simulations. III. The Helium Lya Forest
Statistical Detection of the He II Transverse Proximity Effect: Evidence for Sustained Quasar Activity for >25 Million Years
The Evolution of the He II-ionizing Background at Redshifts 2.3 < z < 3.8 Inferred from a Statistical Sample of 24 HST/COS He II Lya Absorption Spectra
The first measurement of the quasar lifetime distribution
Instrument
COS, COS/FUV, COS/NUV
Temporal Coverage
2010-11-29T05:34:16Z/2011-12-23T12:29:50Z
Version
1.0
Mission Description
Launched in 1990, the NASA/ESA Hubble Space Telescope remains the premier UV and visible light telescope in orbit. With well over 1.6 million observations from 10 different scientific instruments, the ESA Hubble Science Archive is a treasure trove of astronomical data to be exploited.
European Space Agency, Zheng comma Wei, 2012, 'Reionization of Intergalactic Helium at the Highest Redshifts', 1.0, European Space Agency, https://doi.org/10.5270/esa-8xibm1q
