|IC 342||2−6 × 1014||0.2–0.6|
|NGC 253||5 × 1014||4|
|NGC 1068||4 × 1013||24|
|NGC 4418||4.7 × 1015||5|
|NGC 6240||3−4 × 1015||0.7|
IC 342: estimated from Nguyen et al. (1992)(Note that a low HCO+/H13CO+ 1–0 line ratio of 7 suggests that HCO+ columns may be higher. NGC 253: from Martín et al. (2006) (6.5 × 1013 for Tex = 12 K and for 35″ source size. Rescaled N(HCO+) for the 10″ by 14″ H3O+ source size of Knudsen et al. 2007). NGC 1068: we used the data provided in Pérez-Beaupuits et al. (2009) and made a rotational diagram (assuming a 2″ source size) finding Tex(HCO+) = 36 K. NGC 4418: column density for HCO+ (based on data in Aalto et al. (2007) and unpublished JCMT HCO+ 4–3 data) for a 0''̣5 source size. NGC 6240: We estimate the HCO+ column density from the excitation information given in Iono et al. (2007) and for a source size of 1″.
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