Weak 13CO in the Cloverleaf quasar: evidence for a young, early generation starburst

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Table 2:

CO line ratios in the Cloverleaf.
Line	Integrated	$T_{\rm b}$ ratio^a	Reference^b
	line flux	to
	(Jy km s^-1)	¹²CO(3-2)
CO(3-2)	$13.2\pm2.0$	$1.00\pm0.15$	1
CO(4-3)	$21.1\pm3.2$	$0.90\pm0.13$	2
CO(5-4)	$24.0\pm3.6$	$0.65\pm0.09$	2
CO(6-5)	$37.0\pm5.6$	$0.70\pm0.10$	3
CO(7-6)	$45.3\pm6.8$	$0.63\pm0.09$	3
CO(8-7)	$51.4\pm7.7$	$0.55\pm0.08$	3
CO(9-8)	$41.8\pm6.3$	$0.35\pm0.05$	3
¹³CO(3-2)	$0.3\pm0.1$	0.025 ^+0.006_-0.009	4

Notes. ^(a) If all lines have the same area filling factor. Adopted 1 $\sigma$ errors are $\pm$ 10% for the flux densities and $\pm$ 15% for the brightness temperature ratios. ^(b) (1) Weiß et al. (2003); (2) Barvainis et al. (1997); (3) Bradford et al. (2009); (4) this paper.

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