The He II Post-Reionization Epoch: HST/COS Observations of the Quasar HS1700+6416

TL;DR

This study uses HST/COS spectra of quasar HS1700+6416 to investigate the post-reionization epoch of He II, revealing the evolution of optical depth and local ionization conditions after reionization.

Contribution

It provides high-quality COS observations of He II absorption, comparing them with previous FUSE data to better understand the post-reionization ionization state of helium.

Findings

Effective optical depth decreases from 1.8 to 0.7 between z~2.7 and z~2.3.

Detected flux excess near He II Lyα possibly due to quasar emission.

No clear evidence of transverse proximity effects from nearby quasars.

Abstract

The reionization epoch of singly ionized helium (He II) is believed to start at redshifts z~3.5--4 and be nearly complete by z~2.7. We explore the post-reionization epoch with far-ultraviolet spectra of the bright, high-redshift quasar HS1700+6416 taken by the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope, which show strong He II ({\lambda}303.78) absorption shortward of the QSO redshift, z_QSO=2.75. We discuss these data as they probe the post-reionization history of He II and the local ionization environment around the quasar and transverse to the line of sight. We compare previous spectra taken by the Far Ultraviolet Spectroscopic Explorer to the current COS data, which have a substantially higher signal-to-noise ratio. The Gunn-Peterson trough recovers at lower redshifts, with the effective optical depth falling from {\tau}_eff~1.8 at z~2.7 to {\tau}_eff~0.7 at z~2.3. We see an interesting excess of flux near the He II Ly{\alpha} break, which could be quasar line emission, although likely not He II Ly{\alpha}. We present spectra of four possible transverse-proximity quasars, although the UV hardness data are not of sufficient quality to say if their effects are seen along the HS1700 sightline.