Free Access
Volume 576, April 2015
Article Number A35
Number of page(s) 11
Section Interstellar and circumstellar matter
Published online 23 March 2015

Online material

Appendix A: Methylamine and other transitions

thumbnail Fig. A.1

Bargraph plot of the integrated main-beam intensities for the six investigated methylamine transitions. values were calculated for a total column density of 3.4 × 1017 cm-2 as inferred toward G31.41+0.31 from the 62 → 61 transition, assuming a rotational temperature of 120 K. The horizontal line shows the 0.077 K km s-1 3σ value for G31.41+0.31. It is unlikely that the detection of the 236 408 feature (green) in this hot core is methylamine, since the main-beam intensities of other CH3NH2 transitions are above the 3σ value. Particularly the 42 → 41 and 22 → 21 transition (blue) should be visible in our spectra. The remaining transitions (red) are either below detection limit or not observed toward this source.

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Table A.1

All identified transitions for the sources G31.41+0.31 and W3(H2O), with integrated peak area listed.

thumbnail Fig. A.2

Blow-up of the spectral region around the 22 21 transition at 237143 MHz of all analysed hot cores. Despite being a particularly strong transition, it was not observed in any of the spectra.

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Appendix B: ALMA

In the following figure the simulated spectrum of methylamine is shown for a column density of 1.0 × 1015 cm-2 at an excitation temperature of 120 K. Simulations were done with CASSIS using the JPL spectroscopic database. The frequency ranges were taken to cover ALMA Bands 6 and 7. The resolution was set at 0.1 MHz for this spectrum.

thumbnail Fig. B.1

211 to 373 GHz spectrum of methylamine, covering ALMA bands 6 and 7. A column density of 1015 cm-2, Trot and beam size of 1′′ are used.

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Table B.1

Methylamine transition target candidates for ALMA Band 6 and 7.

© ESO, 2015

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