INTENSITY MAPPING WITH CARBON MONOXIDE EMISSION LINES AND THE REDSHIFTED 21 cm LINE
By A. Lidz, S. Furlanetto, S. Oh, J. Aguirre, Tzu-Ching Chang, O. Dor'e, J. Pritchard. 2011
137 citations recorded by the source corpus.
We quantify the prospects for using emission lines from rotational transitions of the CO molecule to perform an “intensity mapping” observation at high redshift during the Epoch of Reionization (EoR). The aim of CO intensity mapping is to observe the combined CO emission from many unresolved galaxies, to measure the spatial fluctuations in this emission, and to use this as a tracer of large-scale structure at very early times in the history of our universe. This measurement would help determine the properties of molecular clouds—the sites of star formation—in the very galaxies that reionize the universe. We further consider the possibility of cross-correlating CO intensity maps with future observations of the redshifted 21 cm line. The cross spectrum is less sensitive to foreground contamination than the auto power spectra, and can therefore help confirm the high-redshift origin of each signal. Furthermore, the cross spectrum measurement would help extract key information about the EoR, especially regarding the size distribution of ionized regions. We discuss uncertainties in predicting the CO signal at high redshift, and discuss strategies for improving these predictions. Under favorable assumptions and feasible specifications for a CO survey mapping the CO(2–1) and CO(1–0) lines, the power spectrum of CO emission fluctuations and its cross spectrum with future 21 cm measurements from the Murchison Widefield Array are detectable at high significance.
Subfields: Astronomy and Astrophysics, Instrumentation
View Paper: https://www.semanticscholar.org/paper/71d8ed20219bda831c7c8ae0a8aa6a0876d07282
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Citations in the corpus
- LATE-TIME COSMOLOGY WITH 21 cm INTENSITY MAPPING EXPERIMENTS (2014, background): “…survey extremely large volumes (Battye et al. 2004, 2013; McQuinn et al. 2006; Loeb & Wyithe 2008; Pritchard & Loeb 2008; Wyithe & Loeb 2008; Chang et al. 2008; Mao et al. 2008; Wyithe et al. 2008; Peterson et al. 2009; Bagla et al. 2010; Seo et al. 2010; Lidz et al. 2011; Ansari et al. 2012).”
- ON THE EFFECT OF THE COSMIC MICROWAVE BACKGROUND IN HIGH-REDSHIFT (SUB-)MILLIMETER OBSERVATIONS (2013, background): “However, at high redshift, the CMB also becomes a stronger background against which both the dust continuum and line fluxes are measured (e.g. in Combes et al. 1999; Papadopoulos et al. 2000; Obreschkow et al. 2009; Lidz et al. 2011; Muñoz & Furlanetto 2013).”
- CRITICAL STAR FORMATION RATES FOR REIONIZATION: FULL REIONIZATION OCCURS AT REDSHIFT z ≈ 7 (2012, methodology): “(21) Here, we have scaled the parameters to the same values assumed by Lidz et al. (2011), namely, ΓH i = 5 × 10−13 s−1, fesc = 0.1, (A color version of this figure is available in the online journal.) an ionizing spectral index α = 2, and redshift z = 5.5, at which Songaila & Cowie (2010) fit λH i…”
- Reionization and the Cosmic Dawn with the Square Kilometre Array (2012, background): “Recently it has been proposed to use rotational lines of CO molecules to probe reionization (e.g., Gong et al. 2011; Carilli 2011; Lidz et al. 2011) showing that a measurement of the cross-correlation should be achievable even for LOFAR (Gong et al. 2011).”
- 21 cm cosmology in the 21st century (2011, background): “As a definite example of the sort of information that might be gathered in molecular line intensity mapping, we will discuss CO, the only line other than the 21 cm line to have been somewhat investigated [174, 175, 176].”