Home > Research > Publications & Outputs > An ALMA [CII] survey of the environments around...

Associated organisational unit

Electronic data

  • TEABAG_NLUAstro_2_53

    Rights statement: Fully open access

    Final published version, 3.31 MB, PDF document

View graph of relations

An ALMA [CII] survey of the environments around bright Lyman-α emitters in the epoch of re-ionisation

Research output: Contribution to journalJournal article

Published
  • Ryan Cooper
  • Bentley Newton
  • Matthew Fletcher
  • Catherine Muller
  • Kyle Turner
  • David Sobral
Close
<mark>Journal publication date</mark>19/06/2020
<mark>Journal</mark>Notices of Lancaster Astrophysics (NLUAstro)
Volume2
Number of pages18
Pages (from-to)53-70
Publication statusPublished
Original languageEnglish

Abstract

The bright early Lyman-α emitters (LAEs) studied here (CR7, VR7 and MASOSA) are some of the brightest known LAEs at high redshift. These galaxies likely reside in early ionised bubbles, producing a significant amount of ionising photons to sustain and reionise the surrounding intergalactic medium during the epoch of reionisation (EoR). It is not clear how those early ionised bubbles formed, but studying luminous LAEs in the EoR could bring us closer to understanding the processes involved. Here we use deep ALMA observations (σ ~ 5mJy/beam km/s) obtained around each bright distant LAE to survey for [CII] emitters at z≈6.5-7.1. This was done by looking for line emitters in the ALMA data using SExtractor and other statistical analysis methods. We have identified 9, 11 & 5 robust candidate [CII] line emitters within the full data-sets for CR7, VR7 & MASOSA respectively. By dividing the number density of sources in the vicinity of each LAE by the average number density of [CII] emitters at z≈7, we find that the immediate environment of bright LAEs is over-dense by factors of about 2 to 4. Our results are consistent with luminous LAEs within the epoch of re-ionisation being in moderately over-dense regions.

Bibliographic note

Cooper et al. (2020), NLUAstro, 2, 53