Table 1: Properties of the HNC, HCN and HCO+ (5-4) lines compared to the CO(4-3) line towards APM 08279+5255
Line $\rm\nu_{\rm obs}$ $I_{\rm line}$ $L^\prime$ $F_{\rm cont}$ Ref
  [GHz] [Jy km s-1] [1010 K km s-1 pc2] [mJy]  
HNC(5-4) 92.282 0.54$^d\ \pm\ $0.25 2.3$\pm$1.1 1.1$^e\ \pm\ $0.15 Present work
CN(4-3) 92.332 0.31$^d\ \pm\ $0.25 1.3 $\pm$1.1 1.1$^e\ \pm\ $0.15 Present work
HCN(5-4) 90.229 0.85$\pm$0.12 3.6$\pm$0.5 1.3$\pm$0.2 (a)
HCO+(5-4) 90.797 0.87$\pm$0.13 3.5$\pm$0.6 1.2$\pm$0.1 (b)
CO(4-3) 93.870 3.70$\pm$0.50 14.7$\pm$1.5 1.2$\pm$0.3 (c)
NOTES. - (a) We06; (b) GB06; (c) Downes et al. (1999); (d) blended line HNC and CN fitted together with FWHP fixed to 400 km s-1; (e) fitted to the line-free channels. The luminosities are calculated from equation [1] of Downes et al. (1999) using the standard concordance cosmology parameters with H0 = 71   km s-1 Mpc-1, $\Omega_m = 0.27$ and $\Omega_\Delta = 0.73$ (Spergel et al. 2003). They are not corrected for the lens amplification.


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