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

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Table 1:

¹³CO(3-2) Observations and results.
Parameter	¹³CO(3-2)
Observed CO(3-2) quantities:
RA (J2000)	14 $^{\rm h}$ 15 $^{\rm m}$ 46 $~.\!\!^{\rm s}$ 28 $\pm$ 0 $~.\!\!^{\rm s}$ 03
Dec (J2000)	+11 $^{\circ}$ 29' 44 $~.\!\!^{\prime\prime}$ 0 $\pm$ 0 $~.\!\!^{\prime\prime}$ 4
Center frequency (GHz)	92.91816
Redshift (LSR)^a	$2.55784\pm 0.00003$
Continuum flux density (mJy)^b	$0.3\pm0.1$
Integrated ¹³CO flux (Jy kms^-1)^b	$0.3\pm0.1$
Derived CO(3-2) quantities:
$L^\prime$ (¹³CO (K kms^-1 pc²)^c	( $1.1\pm 0.3$ ) $\times 10^{10}$
$L^\prime$ (¹²CO (K kms^-1 pc²)^c	( $45.9\pm 3$ ) $\times 10^{10}$
$L^\prime$ ratio ¹²CO/¹³CO(3-2)	40 ⁺²⁵_-8

Notes. ^(a) Adopted from ¹²CO (Weiss et al. 2003). ^(b) In a beam of 6 $~.\!\!^{\prime\prime}$ $1\times 5$ $~.\!\!^{\prime\prime}$ 4. ^(c) This is the lens-amplified value for a luminosity distance of D_L = 21.28 Gpc (H₀ =71 kms^-1 Mpc^-1, $\Omega_{\rm m} = 0.27$ , $\Omega_{\rm vac} = 0.73$ ) and an angular diameter distance of $D_{\rm A} = 1.682$ Gpc; linear scale: $1'' \leftrightarrow 8152$ pc (Wright 2006).

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