UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Three Lyα Emitting Galaxies within a Quasar Proximity Zone at z ~ 5.8

Bosman, SEI; Kakiichi, K; Meyer, RA; Gronke, M; Laporte, N; Ellis, RS; (2020) Three Lyα Emitting Galaxies within a Quasar Proximity Zone at z ~ 5.8. The Astrophysical Journal , 896 (1) , Article 896. 10.3847/1538-4357/ab85cd. Green open access

[thumbnail of Ellis_Three Lyman-alpha emitting galaxies within a quasar proximity zone at z ~ 5.8_VoR.pdf]
Preview
Text
Ellis_Three Lyman-alpha emitting galaxies within a quasar proximity zone at z ~ 5.8_VoR.pdf - Published version

Download (4MB) | Preview

Abstract

Quasar proximity zones at z > 5.5 correspond to overdense and overionized environments. Galaxies found inside proximity zones can therefore display features that would otherwise be masked by absorption in the intergalactic medium. We demonstrate the utility of this quasar-galaxy synergy by reporting the discovery of the first three “proximate Lyα emitters” (LAEs) within the proximity zone of quasar J0836+0054 at z = 5.795 (Aerith A, B, and C). Aerith A, located behind the quasar with an impact parameter D^{\perp} = 278 \pm 8 pkpc, provides the first detection of an Lyα transverse proximity effect. We model the transmission and show that it constrains the onset of J0836ʼs quasar phase to 0.2Myr < 28Myr < t in the past. The second object, Aerith B at a distance D < 912 pkpc from the quasar, displays a bright and broad double-peaked Lyα emission line. The peak separation implies a low ionizing f_{esc} \leqslant 1%. We fit the Lyα line with an outflowing shell model, finding a typical central density log N_{HI}/cm^{-2} = 19.3_{-0.2}^{+0.8}, outflow velocity v_{out} = 16_{-11}^{+4}km s^{-1}, and gas temperature log T/K = 3.8_{-0.7}^{+0.8} compared to 2 < z < 3 analog LAEs. We detect object Aerith C via an Lyα emission line at z = 5.726. This corresponds with the edge of the quasar’s proximity zone (Dz < 0.02), suggesting that the proximity zone is truncated by a density fluctuation. Via the analyses conducted here, we illustrate how proximate LAEs offer unique insight into the ionizing properties of both quasars and galaxies during hydrogen reionization.

Type: Article
Title: Three Lyα Emitting Galaxies within a Quasar Proximity Zone at z ~ 5.8
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/ab85cd
Publisher version: https://doi.org/10.3847/1538-4357/ab85cd
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: Lyman-break galaxies (979); Lyman alpha forest (980); Spectroscopy(1558); Quasar-galaxy pairs (1316); Quasars (1319); Galaxies (573); Galaxy formation (595); Reionization (1383); Early universe (435)
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10094353
Downloads since deposit
36Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item