Table 3
Best-fit parameters obtained for the L1551 IRS 5 northern disk using two different approaches.
Species | nlines | Eup (K) | N (cm−2) | Tex (K) | FWHM (km s−1) | vLSR (km s−1) | s (″) |
COMs with free parameters | |||||||
CH3OH | 18 | 56–946 | ![]() |
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CH3OHa | 7 | 657–946 | ![]() |
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13CH3OH | 3 | 162–254 | ![]() |
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CH318OH | 9 | 33–96 | ![]() |
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CH2DOH | 9 | 49–352 | ![]() |
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CH2DOHb | 6 | 49–352 | ![]() |
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CH3CHO | 27 | 6 –387 | ![]() |
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CH3OCH3 | 8 | 81–253 | ![]() |
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CH3OCHO | 34 | 106–412 | ![]() |
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CH3COCH3 | 13 | 111–116 | ![]() |
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C2H5OH | 24 | 24–464 | ![]() |
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C2H5CN | 20 | 147–368 | ![]() |
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13CH3CN | 5 | 78–257 | ![]() |
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CH3C15N | 3 | 78–335 | ![]() |
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COMs with Tex = 177.6K, FWHM = 2.17km s−1, vLSR = 9.67 km s−1 and s = 0.08″ | |||||||
CH3OH | 18 | 56–946 | ![]() |
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CH3OHa | 7 | 657–946 | ![]() |
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13CH3OH | 3 | 162–254 | ![]() |
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CH318OH | 9 | 33–96 | ![]() |
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CH2DOH | 9 | 49–352 | ![]() |
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CH2DOHb | 6 | 49–352 | ![]() |
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CH3CHO | 27 | 65–387 | ![]() |
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CH3OCH3 | 8 | 81–253 | ![]() |
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CH3OCHO | 34 | 106–412 | ![]() |
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CH3COCH3 | 13 | 111–116 | ![]() |
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C2H5OH | 24 | 24–464 | ![]() |
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C2H5CN | 20 | 147–368 | ![]() |
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13CH3CN | 5 | 78–257 | ![]() |
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CH3C15N | 3 | 78–335 | ![]() |
Notes. The top part of the table shows the results from the runs with all parameters left free, and the bottom part when fixing the Tex, FWHM, vLSR, and s to the median values obtained from the all-free runs. The uncertainties listed in each column only represent the statistical uncertainties from the fitting procedure. For CH3 OH we include the results obtained using only the high excitation lines (flagged with a), and for CH2DOH we include the results obtained using only the lines with the lowest opacities (flagged with b). The second and third columns are the number of transitions used in the fit and their Eup range.
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