Development of Hydrogen and Helium Proximity Zones around Quasars
Abstract
Increasing evidence suggests that He II proximity profiles in the quasar spectra at z ~ 3 - 4 are sensitive probes of quasar ages. But the development of their H I counterparts is difficult to trace and remains poorly constrained. We compare the UV spectra of 15 He II quasars with their high-resolution optical counterparts and find a significant correlation between the sizes of He II and H I proximity zones. The luminous quasar HE2347-4342...
Paper Details
Title
Development of Hydrogen and Helium Proximity Zones around Quasars
Published Date
Aug 13, 2019
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