Water and Methanol Ice in L1544
- Autor(en)
- Miwa Goto, A. I. Vasyunin, B. M. Giuliano, I. Jiménez-Serra, P. Caselli, C. G. Román-Zúñiga, J. Alves
- Abstrakt
Context. Methanol and complex organic molecules have been found in cold starless cores, where a standard warm-up scenario would not work because of the absence of heat sources. A recent chemical model attributed the presence of methanol and large organics to the efficient chemical desorption and a class of neutral-neutral reactions that proceed fast at low temperatures in the gas phase.
Aims. The model calls for a high abundance of methanol ice at the edge of the CO freeze-out zone in cold cloud cores.
Methods. We performed medium-resolution spectroscopy toward three field stars behind the starless core L 1544 at 3 μm to constrain the methanol ice abundance and compare it with the model predictions.
Results. One of the field stars shows a methanol ice abundance of 11% with respect to water ice. This is higher than the typical methanol abundance previously found in cold cloud cores (4%), but is 4.5 times lower than predicted. The reason for the disagreement between the observations and the model calculations is not yet understood.- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Ludwig-Maximilians-Universität München, Ural Federal University, Ventspils University of Applied Sciences, Max-Planck-Institut für extraterrestrische Physik, Instituto Nacional de Técnica Aerospacial, Universidad Nacional Autonoma de Mexico
- Journal
- Astronomy & Astrophysics
- Band
- 651
- Anzahl der Seiten
- 8
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361/201936385
- Publikationsdatum
- 07-2021
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie, 103004 Astrophysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Astronomy and Astrophysics, Space and Planetary Science
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/8392e605-20d4-471d-bebf-1c33e8b77f1f