A Caltech Library Service

Intensity Mapping across Cosmic Times with the Lyα Line

Pullen, Anthony R. and Doré, Olivier and Bock, Jamie (2014) Intensity Mapping across Cosmic Times with the Lyα Line. Astrophysical Journal, 786 (2). Art. No. 111. ISSN 0004-637X. doi:10.1088/0004-637X/786/2/111.

[img] PDF - Published Version
See Usage Policy.

PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We present a quantitative model of Lyα emission throughout cosmic history and determine the prospects for intensity mapping spatial fluctuations in the Lyα signal. Since (1) our model assumes at z > 6 the minimum star formation required to sustain reionization and (2) is based at z < 6 on a luminosity function (LF) extrapolated from the few observed bright Lyα emitters, this should be considered a lower limit. Mapping the line emission allows probes of reionization, star formation, and large-scale structure (LSS) as a function of redshift. While Lyα emission during reionization has been studied, we also predict the postreionization signal to test predictions of the intensity and motivate future intensity mapping probes of reionization. We include emission from massive dark matter halos and the intergalactic medium (IGM) in our model. We find agreement with current, measured LFs of Lyα emitters at z < 8. However, diffuse IGM emission, not associated with Lyα emitters, dominates the intensity up to z ~ 10. While our model is applicable for deep-optical or near-infrared observers like the James Webb Space Telescope, only intensity mapping will detect the diffuse IGM emission. We also construct a three-dimensional power spectrum model of the Lyα emission. Finally, we consider the prospects of an intensity mapper for measuring Lyα fluctuations while identifying interloper contamination for removal. Our results suggest that while the reionization signal is challenging, Lyα fluctuations can be an interesting new probe of LSS at late times when used in conjunction with other lines, e.g., Hα, to monitor low-redshift foreground confusion.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle Paper
Doré, Olivier0000-0002-5009-7563
Bock, Jamie0000-0002-5710-5212
Alternate Title:Intensity Mapping across Cosmic Times with the Lyman-Alpha Line
Additional Information:© 2014 The American Astronomical Society. Received 2013 December 13; accepted 2014 March 22; published 2014 April 24. We thank P. Capak, A. Cooray, S. Furlanetto, Y. Gong, C. Hirata, A. Lidz, G. Rudie, M. Viero, and M. Zemcov for helpful comments and useful discussions. Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. A.P. was supported by an appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, California Institute of Technology, administered by Oak Ridge Associated Universities through a contract with NASA. This work was supported by the Keck Institute of Space Studies and we thank colleagues at the “First Billion Years” for stimulating discussions, in particular J. Bowman and A. Readhead for organizing it.
Group:Keck Institute for Space Studies
Funding AgencyGrant Number
NASA Postdoctoral ProgramUNSPECIFIED
Keck Institute for Space Studies (KISS)UNSPECIFIED
Subject Keywords:cosmology: observations; diffuse radiation; intergalactic medium; large-scale structure of universe
Issue or Number:2
Record Number:CaltechAUTHORS:20130925-143816733
Persistent URL:
Official Citation:Anthony R. Pullen et al 2014 ApJ 786 111
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41533
Deposited By: Ruth Sustaita
Deposited On:25 Sep 2013 21:49
Last Modified:10 Nov 2021 04:31

Repository Staff Only: item control page