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Table 3.
Upper limits on molecular gas mass for galaxies undetected in CO(1-0) and CO(2-1).
| Galaxy | Line | rms (mK) |  (K km s−1 pc−2) |
M(H2) (108 M⊙) |
| IRAM 30 m observations | ||||
| NGC 128 | CO(1-0) | 0.9 | <0.13 | <0.60 |
| CO(2-1) | 0.9 | <0.04 | <0.16 | |
| NGC 410 | CO(1-0) | 1.0 | <0.25 | <1.17 |
| CO(2-1) | 1.2 | <0.08 | <0.37 | |
| NGC 584 | CO(1-0) | 1.5 | <0.02 | <0.11 |
| CO(2-1) | 1.2 | <0.005 | <0.02 | |
| NGC 978 | CO(1-0) | 0.7 | <0.15 | <0.70 |
| CO(2-1) | 0.8 | <0.04 | <0.19 | |
| NGC 1453 | CO(1-0) | 1.3 | <0.17 | <0.78 |
| CO(2-1) | 3.0 | <0.09 | <0.43 | |
| NGC 1550 | CO(1-0) | 0.9 | <0.10 | <0.47 |
| CO(2-1) | 1.4 | <0.04 | <0.19 | |
| NGC 2563 | CO(1-0) | 1.1 | <0.20 | <0.93 |
| CO(2-1) | 1.2 | <0.06 | <0.26 | |
| NGC 3325 | CO(1-0) | 1.2 | <0.34 | <1.57 |
| CO(2-1) | 1.7 | <0.12 | <0.55 | |
| NGC 4008 | CO(1-0) | 1.2 | <0.16 | <0.73 |
| CO(2-1) | 1.7 | <0.06 | <0.26 | |
| NGC 4261 | CO(1-0) | 2.1 | <0.08 | <0.37 |
| CO(2-1) | 1.2 | <0.01 | <0.06 | |
| NGC 4956 | CO(1-0) | 0.7 | <0.16 | <0.75 |
| CO(2-1) | 0.9 | <0.05 | <0.24 | |
| NGC 5444 | CO(1-0) | 0.9 | <0.14 | <0.64 |
| CO(2-1) | 1.4 | <0.06 | <0.26 | |
| NGC 5490 | CO(1-0) | 0.6 | <0.14 | <0.64 |
| CO(2-1) | 1.2 | <0.07 | <0.33 | |
| NGC 5629 | CO(1-0) | 1.0 | <0.20 | <0.91 |
| CO(2-1) | 1.7 | <0.09 | <0.40 | |
| NGC 6658 | CO(1-0) | 0.9 | <0.15 | <0.71 |
| CO(2-1) | 1.1 | <0.05 | <0.23 | |
| NGC 5813 | CO(1-0) | 0.6 | <0.02 | <0.11 |
| CO(2-1) | 0.9 | <0.01 | <0.04 | |
| NGC 7619 | CO(1-0) | 0.5 | <0.06 | <0.29 |
| CO(2-1) | 1.2 | <0.04 | <0.19 | |
| APEX observations | ||||
| NGC 2292 | CO(2-1) | 1.3 | <0.10 | <0.47 |
| NGC 3923 | CO(2-1) | 1.6 | <0.06 | <0.29 |
| NGC 5061 | CO(2-1) | 1.3 | <0.09 | <0.43 |
| NGC 5153 | CO(2-1) | 1.2 | <0.38 | <1.75 |
| NGC 5903 | CO(2-1) | 1.5 | <0.13 | <0.58 |
| NGC 1395 | CO(2-1) | 1.3 | <0.06 | <0.27 |
| NGC 3078 | CO(2-1) | 0.5 | <0.05 | <0.23 |
| NGC 5084 | CO(2-1) | 0.7 | <0.03 | <0.16 |
Notes. The rms values are in Tmb in channels of 50 km s−1. The upper limits on 
and M(H2) are at 3σ and assume Δ V = 300 km s−1. Note that the upper limits reported for NGC 128 reflect measurements in the galaxy centre.
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