First Results from COPSS: The CO Power Spectrum Survey
Garrett K. Keating, Geoffrey C. Bower, Daniel P. Marrone, David R., DeBoer, Carl Heiles, Tzu-Ching Chang, John E. Carlstrom, Christopher H., Greer, David Hawkins, James W. Lamb, Erik Leitch, Amber D. Miller, Stephen, Muchovej, David P. Woody

TL;DR
This paper presents initial constraints on early Universe CO abundance using intensity mapping from the COPSS survey, demonstrating the feasibility of probing molecular gas at high redshift and setting upper limits on the CO power spectrum.
Contribution
First application of intensity mapping to measure the CO power spectrum at high redshift, providing new upper limits and demonstrating foreground mitigation techniques.
Findings
Constrained the CO power spectrum to less than 2.6×10^4 μK^2 (h^{-1} Mpc)^3.
Set an upper limit on the molecular gas density at z~3 of 2.8×10^8 M_⊙ Mpc^{-3}.
Demonstrated foreground mitigation in intensity mapping data.
Abstract
We present constraints on the abundance of carbon-monoxide in the early Universe from the CO Power Spectrum Survey (COPSS). We utilize a data set collected between 2005 and 2008 using the Sunyaev-Zel'dovich Array (SZA), which were previously used to measure arcminute-scale fluctuations of the CMB. This data set features observations of 44 fields, covering an effective area of 1.7 square degrees, over a frequency range of 27 to 35 GHz. Using the technique of intensity mapping, we are able to probe the CO(1-0) transition, with sensitivity to spatial modes between over a range in redshift of , spanning a comoving volume of . We demonstrate our ability to mitigate foregrounds, and present estimates of the impact of continuum sources on our measurement. We constrain the CO power spectrum to…
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