...

On leave from the Ioffe Physico-Technical Institute, St. Petersburg, Russia.

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... region

Note that $\mu = m_{\rm p}/m_{\rm e}$ in Flambaum & Kozlov (2007).
$1~{\rm ppm} \equiv 10^{-6}$.

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... objects

Emission lines from the rotational transitions of CO were detected in $\sim$40 galaxies at z > 1 (for a review, see Solomon & Vanden Bout 2005), and recently at z = 5.0267 towards SDSS J033829.31+002156.3 (Maiolino et al. 2007) and z = 5.7722 towards SDSS J0927+2001 (Carilli et al. 2007).

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... (SOFIA)

http://www.sofia.usra.edu/

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... (HSO)

http://herschel.esac.esa.int/

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... (ALMA)

http://www.eso.org/alma/

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