Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Reionization by UV or X-ray sources
 
Loading...
Thumbnail Image
research article

Reionization by UV or X-ray sources

Baek, S.
•
Semelin, B.
•
Di Matteo, P.
Show more
2010
Astronomy & Astrophysics

We present simulations of the 21-cm signal during the epoch of reionization. We focus on properly modeling the absorption regime in the presence of inhomogeneous Wouthuysen-Field effect and X-ray heating. We ran radiative transfer simulations for three bands in the source spectrum (Lyman, UV, and X-ray) to fully account for these processes. We find that the brightness temperature fluctuation of the 21 cm signal has an amplitude greater than 100 mK during the early reionization, up to 10 times greater than the typical amplitude of a few 10 mK obtained during the later emission phase. More importantly, we find that even a rather high contribution from QSO-like sources only damps the absorption regime without erasing it. Heating the IGM with X-ray takes time. Our results show that observations of the early reionization will probably benefit from a higher signal-to-noise value than during later stages. After analyzing the statistical properties of the signal (power spectrum and PDF) we find three diagnostics to constrain the level of X-ray, hence the nature of the first sources.

  • Details
  • Metrics
Type
research article
DOI
10.1051/0004-6361/201014347
Web of Science ID

WOS:000285346600008

Author(s)
Baek, S.
•
Semelin, B.
•
Di Matteo, P.
•
Revaz, Y.  
•
Combes, F.
Date Issued

2010

Published in
Astronomy & Astrophysics
Volume

523

Start page

A4

Subjects

dark ages, reionization, first stars

•

radiative transfer

•

HII regions

•

quasars: general

•

intergalactic medium

•

early Universe

•

Simulating Cosmic Reionization

•

High-Redshift Universe

•

21 Cm Signal

•

Radiative-Transfer

•

Intergalactic Medium

•

Hydrogen Reionization

•

Ionizing-Radiation

•

Comparison Project

•

Large Scales

•

Fluctuations

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
Available on Infoscience
December 16, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/74885
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés