Dating individual quasars with the He II proximity effect
Development of Hydrogen and Helium Proximity Zones around Quasars
Evidence for short ~ 1 Myr lifetimes from the He II proximity zones of z ~ 4 quasars
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 Extremely Luminous Quasar Survey in the Sloan Digital Sky Survey Footprint. II. The North Galactic Cap Sample
The first measurement of the quasar lifetime distribution
Instrument
COS, COS/FUV, COS/NUV
Temporal Coverage
2013-04-11T15:17:22Z/2013-12-04T22:14:37Z
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, Worseck comma Gabor, 2014, 'How Extended was Helium II Reionization? A Statistical Census Probing Deep into the Reionization Era', 1.0, European Space Agency, https://doi.org/10.5270/esa-napmqkj