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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29689
Title: Beacons into the Cosmic Dark Ages: Boosted Transmission of Lyα from UV Bright Galaxies at z ≳ 7
Authors: Mason, Charlotte A.
Treu, Tommaso
de Barros, Stephane
Dijkstra, Mark
FONTANA, Adriano 
Mesinger, Andrei
PENTERICCI, Laura 
Trenti, Michele
VANZELLA, Eros 
Issue Date: 2018
Journal: THE ASTROPHYSICAL JOURNAL LETTERS 
Number: 857
Issue: 2
First Page: L11
Abstract: Recent detections of Lyman alpha (Lyα) emission from z > 7.5 galaxies were somewhat unexpected given a dearth of previous non-detections in this era when the intergalactic medium (IGM) is still highly neutral. But these detections were from UV bright galaxies, which preferentially live in overdensities that reionize early, and have significantly Doppler-shifted Lyα line profiles emerging from their interstellar media (ISM), making them less affected by the global IGM state. Using a combination of reionization simulations and empirical ISM models we show, as a result of these two effects, that UV bright galaxies in overdensities have >2× higher transmission through the z ∼ 7 IGM than typical field galaxies, and that this boosted transmission is enhanced as the neutral fraction increases. The boosted transmission is not sufficient to explain the observed high Lyα fraction of M <SUB> UV </SUB> ≲ -22 galaxies, suggesting that Lyα emitted by these galaxies must be stronger than expected due to enhanced production and/or selection effects. Despite the bias of UV bright galaxies to reside in overdensities we show Lyα observations of such galaxies can accurately measure the global neutral hydrogen fraction, particularly when Lyα from UV faint galaxies is extinguished, making them ideal candidates for spectroscopic follow-up into the cosmic Dark Ages.
URI: http://hdl.handle.net/20.500.12386/29689
URL: https://iopscience.iop.org/article/10.3847/2041-8213/aabbab
ISSN: 2041-8205
DOI: 10.3847/2041-8213/aabbab
Bibcode ADS: 2018ApJ...857L..11M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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