Free Access

Table 7

H2 masses using CO observations, dust measurements, and models.

Galaxy From CO observations From dust From LTE From Cloudy

X CO / X CO,gal (a) MH2 (M) MH2 (M) (M) MH2 (M)


CO(1–0) R21 = 0.8(b) R31 = 0.6(c) Average CO-free CO-traced

Haro 11 1 <4.4 × 108 3.3 × 108 1.7 × 108 2.5 × 108 3.6 × 109 >3.6 × 106< 2.4 × 108 1.2 × 108 1.6 × 109
10 <4.4 × 109 3.3 × 109 1.7 × 109 2.5 × 109
Mrk 1089 1 3.1 × 108 3.9 × 108 1.6 × 108 2.9 × 108 8.3 × 108
16 4.9 × 109 6.2 × 109 2.5 × 109 4.5 × 109
Mrk 930 1 3.1 × 107 <9.8 × 107 3.1 × 107 1.0 × 109
22 6.8 × 108 <2.1 × 109 6.8 × 108
NGC 4861 1 <7.3 × 105 <1.2 × 106 <7.3 × 105
42 <3.1 × 107 <5.1 × 107 <3.1 × 107
Total 1 <2.6 × 106 <2.6 × 106 1.7 × 108
NGC 625 1 <1.9 × 106 1.1 × 106 9.0 × 105 1.0 × 106
9 <1.7 × 107 9.7 × 106 8.2 × 106 9.0 × 106
Total 1 5.0 × 106 5.0 × 106 9.4 × 107 >5.8 × 103< 5.7 × 105
UM 311 1 <2.7 × 107 2.0 × 107 9.4 × 106 1.5 × 107
4 <1.2 × 108 8.5 × 107 4.1 × 107 6.3 × 107
Total 1 <1.3 × 108 9.8 × 107 9.8 × 107 3.3 × 109

Notes. The H2 masses from CO observations are measured within the CO beams. For extended galaxies, we also consider the estimated total CO emission (see Sect. 3.2 for details). (a) Ratio of our adopted XCO value to the Galactic value XCO,gal. To bracket the range of molecular gas masses, there are two lines for each galaxy corresponding to the molecular masses derived with two values of the XCO factor: XCO = XCO,gal (lower mass case) and XCO = XCO,ZZ-2 (upper mass case). (b)R21 is the CO(2–1)/CO(1–0) ratio. (c)R31 is the CO(3–2)/CO(1–0) ratio.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.