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Probing Reionization with Intensity Mapping of Molecular and Fine Structure Lines

Gong, Yan and Cooray, Asantha and Silva, Marta B. and Santos, Mario G. and Lubin, Phillip (2011) Probing Reionization with Intensity Mapping of Molecular and Fine Structure Lines. Astrophysical Journal Letters, 728 (2). Art. No. L46. ISSN 2041-8205. doi:10.1088/2041-8205/728/2/L46.

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We propose observations of the molecular gas distribution during the era of reionization. At z~ 6-8, the ^(12)CO(J = 1-0) line intensity results in a mean brightness temperature of about 0.5 μK with an rms fluctuation of 0.1 μK at 1-10 Mpc spatial scales, corresponding to 30 arcminute angular scales. This intensity fluctuations can be mapped with an interferometer, similar to existing and planned 21 cm background experiments, but operating at ~12-17 GHz. We discuss the feasibility of detecting the cross-correlation between H I and CO molecular gas since such a cross-correlation has the advantage that it will be independent of systematics and most foregrounds in each of the 21 cm and CO(1-0) line experiments. Additional instruments tuned to higher-order transitions of the CO molecule or an instrument operating with high spectral resolution at millimeter wavelengths targeting 158 μm C II could further improve the reionization studies with molecular gas. The combined 21 cm and CO line observations has the potential to establish the relative distribution of gas in the intergalactic medium and molecular gas that are clumped in individual first-light galaxies that are closely connected to the formation of massive stars in these galaxies.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Cooray, Asantha0000-0002-3892-0190
Silva, Marta B.0000-0003-0209-4816
Santos, Mario G.0000-0003-3892-3073
Additional Information:© 2011 The American Astronomical Society. Received 2010 December 22. Accepted 2011 January 18. Published 2011 February 2. We thank participants of the Kavli Institute for Space Studies' (KISS) Billion Years workshop for helpful discussions. This work was supported by NSF CAREER AST-0645427 at UCI. M.G.S. and M.B.S. acknowledge support from FCT-Portugal under grant PTDC/FIS/100170/2008.
Group:Keck Institute for Space Studies
Funding AgencyGrant Number
Keck Institute for Space Studies (KISS)UNSPECIFIED
Fundação para a Ciência e a Tecnologia (FCT)PTDC/FIS/100170/2008
Subject Keywords:cosmology: theory; diffuse radiation; galaxies: starburst; radio lines: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20160224-152402482
Persistent URL:
Official Citation:Yan Gong et al 2011 ApJ 728 L46
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64749
Deposited By: Colette Connor
Deposited On:24 Feb 2016 23:48
Last Modified:10 Nov 2021 23:34

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