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Context. We present our findings for the HCN/H13CN 1-0 line ratio in themolecular outflow of Arp 220 west based on high-resolution ALMA data. Aims.Molecular gas masses in the outflowing gas of galaxies driven by activegalactic nuclei (AGNs) or starbursts are important parameters for understandingthe feedback of these latter two phenomena and star-formation quenching. Theconversion factor of line luminosities to masses is related to the opticaldepth of the molecular lines. Methods. Using H13CN 1-0, the isotopic line ofHCN 1-0, to obtain the line ratio of HCN/H13CN 1-0 is an ideal way to derivethe optical depth of HCN 1-0 in outflowing gas. Results. With the nondetectionof H13CN 1-0 in the outflowing gas, a 3{\sigma} lower limit of HCN/H13CN 1-0line ratio is obtained, which is at least three times higher than that found inthe whole of the whole system of Arp 220. The high HCN/H13CN 1-0 line ratioindicates low opacity of HCN 1-0 in the outflowing gas, even though the upperlimit of HCN 1-0 opacity obtained here is still not good enough to draw anyrobust conclusions if HCN 1-0 is optically thin. A lower conversion factor ofHCN 1-0 luminosity to dense gas mass in the outflowing gas should be used thanthat used for the host galaxy of Arp 220.

HCN (1-0) opacity of outflowing gas in Arp 220W