Table 3
Upper limit column densities and abundance ratios for methylamine.
| Source | NS,CH3NH2 | CH3NH2/NH2CHO | CH3NH2/CH3OH | NH2CHO/CH3OH | NH2CHOupper/CH3OH |
| cm-2 | |||||
|
|
|||||
| Model F | 1.1 | 3.4E-02 | 3.1E-02 | 3.1E-02 | |
| Model M | 1.7 | 1.0E-01 | 7.3E-02 | 7.3E-02 | |
| Model S | 1.3 | 1.3E-01 | 1.0E-01 | 1.0E-01 | |
|
|
|||||
| AFGL 2591 | <1.9E+16 | – | – | <3.9E-01 | – |
| G24.78 | <2.4E+16 | <3.3E+01 | <8.5E-02 | 2.6E-03 | 9.0E-04 |
| G31.41+0.31 | <5.8E+16 | <2.8E+01 | <4.9E-02 | 1.8E-03 | 3.8E-03 |
| G75.78 | <3.5E+16 | <1.7E+02 | <3.1E-01 | 1.8E-03 | 2.6E-02 |
| IRAS 18089-1732 | <4.2E+16 | <5.0E+01 | <1.9E-01 | 3.8E-03 | 7.9E-03 |
| IRAS 20126+4104 | <6.4E+16 | – | <2.2 | – | – |
| NGC 7538 IRS1 | <2.0E+16 | <3.5E+01 | <1.8E-01 | 4.8E-03 | 2.1E-04 |
| W3(H2O) | <5.0E+16 | <3.9E+01 | <5.0E-02 | 1.3E-03 | 6.4E-04 |
| W3(H2O)* | <1.7E+16 | <1.3E+01 | <1.7E-02 | 1.3E-03 | 6.4E-04 |
| W 33A | <5.7E+16 | <2.7E+01 | <2.9E-01 | 1.1E-02 | 4.6E-03 |
|
|
|||||
| Sgr B2a | 1.2E+14 | 5.7E-01 | 1.7E-02 | 1.3E-02 | |
| Sgr B2(M)b | 4.5E+16 | 3.2 | 1.7E-02 | 5.2E-03 | |
| Sgr B2(N)b | 6.0E+17 | 4.3E-01 | 3.3E-02 | 7.8E-02 | |
| Sgr B2(N)c | 5.0E+17 | 2.1 | 1.0E-01 | 4.8E-02 | |
| Orion Compact Ridged | – | – | – | 1.6E-03 | |
Notes. Column densities for the assumed source size and upper limit abundance ratios for methylamine, derived from the 22−21 line assuming Trot = 120 K. The values for NH2CHO and CH3OH where taken from Bisschop et al. (2007) and Isokoski et al. (2013). The upper limits of NH2CHO were determined by our own re-analysis of the Bisschop et al. (2007) data and taken from the appendix of Isokoski et al. (2013).
Reference.
Turner (1991), beam sizes between 65′′ and 107′′, assuming no beam dilution;
Belloche et al. (2013), beam sizes between 25′′ and 30′′, assuming a 3′′ source size for (N) and 5′′ source size for (M);
Neill et al. (2014), beam sizes between 10′′ and 40′′, assuming source size of 2.5′′; and
Crockett et al. (2014) beam sizes between 44′′ and 11′′ and assuming a 10′′ size of the Compact Ridge.
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