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Abundant Methanol Ice toward a Massive Young Stellar Object in the Central Molecular Zone

An, Deokkeun and Sellgren, Kris and Boogert, A. C. Adwin and Ramírez, Solange V. and Pyo, Tae-Soo (2017) Abundant Methanol Ice toward a Massive Young Stellar Object in the Central Molecular Zone. Astrophysical Journal Letters, 843 (2). Art. No. L36. ISSN 2041-8213. https://resolver.caltech.edu/CaltechAUTHORS:20170714-080642885

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Abstract

Previous radio observations revealed widespread gas-phase methanol (CH_3OH) in the Central Molecular Zone (CMZ) at the Galactic center (GC), but its origin remains unclear. Here, we report the discovery of CH_3OH ice toward a star in the CMZ, based on a Subaru 3.4–4.0 μm spectrum, aided by NASA/IRTF L’ imaging and 2–4 μm spectra. The star lies ~8000 au away in projection from a massive young stellar object (MYSO). Its observed high CH_3OH ice abundance (17% ± 3% relative to H_2O ice) suggests that the 3.535 μm CH_3OH ice absorption likely arises in the MYSO's extended envelope. However, it is also possible that CH_3OH ice forms with a higher abundance in dense clouds within the CMZ, compared to within the disk. Either way, our result implies that gas-phase CH_3OH in the CMZ can be largely produced by desorption from icy grains. The high solid CH_3OH abundance confirms the prominent 15.4 μm shoulder absorption observed toward GC MYSOs arises from CO_2 ice mixed with CH_3OH.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/2041-8213/aa7cfeDOIArticle
http://iopscience.iop.org/article/10.3847/2041-8213/aa7cfe/metaPublisherArticle
https://arxiv.org/abs/1707.03120arXivDiscussion Paper
ORCID:
AuthorORCID
Pyo, Tae-Soo0000-0002-3273-0804
Additional Information:© 2017 The American Astronomical Society. Received 2017 May 23; revised 2017 June 23; accepted 2017 June 29; published 2017 July 13. D.A. acknowledges support provided by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2015R1D1A1A09058700) and by the Korean NRF to the Center for Galaxy Evolution Research (No. 2010-0027910). Facilities: IRTF - Infrared Telescope Facility, Subaru. - Subaru Telescope. Based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
Funders:
Funding AgencyGrant Number
National Research Foundation of KoreaNRF-2015R1D1A1A09058700
National Research Foundation of Korea2010-0027910
Issue or Number:2
Record Number:CaltechAUTHORS:20170714-080642885
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170714-080642885
Official Citation:Deokkeun An et al 2017 ApJL 843 L36
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79103
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:14 Jul 2017 16:12
Last Modified:03 Oct 2019 18:16

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