Observations Of CH3OH And CH3CHO In A Sample of Protostellar Outflow Sources

Iram 30-m Observations towards eight protostellar outflow sources were taken in the 96-176 GHz range. Transitions of CH3OH and CH3CHO were detected in seven of them.

The integrated emission of the transitions of each species that fell into the observed frequency range were measured and fit using RADEX and LTE models. Column densities and gas properties inferred from this fitting are presented. The ratio of the A and E-type isomers of CH3OH indicate that the methanol observed in these outflows was formed on the grain surface. Both species demonstrate a reduction of terminal velocity in their line profiles in faster outflows, indicating destruction in the post-shock gas phase. This destruction, and a near constant ratio of the CH3OH and CH3CHO column densities imply it is most likely that CH3CHO also forms on the grain surface.

Jonathan Holdship, Serena Viti, Claudio Codella, Jonathan Rawlings, Izaskun Jimenez-Serra, Yenabeb Ayalew, Justin Curtis, Annur Habib, Jamel Lawrence, Sumaya Warsame, Sarah Horn
(Submitted on 25 Apr 2019)

Comments: Accepted for publication in ApJ
Subjects: Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:1904.11360 [astro-ph.GA] (or arXiv:1904.11360v1 [astro-ph.GA] for this version)
Submission history
From: Jonathan Holdship
[v1] Thu, 25 Apr 2019 14:10:20 UTC (751 KB)
Astrobiology, Astrochemistry

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