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Title: Constraining the Tail End of Reionization Using Ly α Transmission Spikes

Journal Article · · The Astrophysical Journal (Online)
ORCiD logo [1];  [2]; ORCiD logo [3]
  1. Max Planck Inst. for Astrophysik, Garching (Germany); Univ. of Bonn (Germany)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, IL (United States)
  3. Univ. of California, Santa Cruz, CA (United States)

We study Lyα transmission spikes at z > 5 in synthetic quasar spectra and discuss their connection to the properties of the intergalactic medium and their ability to constrain reionization models. We use state-of-the-art radiation-hydrodynamic simulations from the Cosmic Reionization On Computers series to predict the number of transmission spikes as a function of redshift, both in the ideal case of infinite spectral resolution and in a realistic observational setting. Transmission spikes are produced in highly ionized underdense regions located in the vicinity of UV sources. We find that most of the predicted spikes are unresolved by current observations and show that our mock spectra are consistent with observations of the quasar ULAS J1120+0641 in about 15% of the realizations. The spike height correlates with both the gas density and the ionized fraction, but the former link is erased when synthetic spectra are smoothed to realistically achievable spectral resolutions. There exists a linear relationship between spike width and the extent of the associated underdense region, with a slope that is redshift dependent. In agreement with observations, the spike transmitted flux is suppressed at small distance from bright galaxies as these reside in overdense regions. We contest that this anticorrelation can be used to constrain large-scale density modes.

Research Organization:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1511706
Report Number(s):
arXiv:1902.07713; FERMILAB-PUB-19-087-A; 1721114
Journal Information:
The Astrophysical Journal (Online), Vol. 876, Issue 1; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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A tale of seven narrow spikes and a long trough: constraining the timing of the percolation of HII bubbles at the tail-end of reionization with ULAS J1120+0641 text January 2017
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Cited By (3)

Long troughs in the Lyman-α forest below redshift 6 due to islands of neutral hydrogen journal November 2019
The influence of metagalactic ultraviolet background fluctuations on the high-redshift Lyα forest journal December 2019
Long troughs in the Lyman-α forest below redshift 6 due to islands of neutral hydrogen text January 2020