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http://hdl.handle.net/20.500.12386/32416
Titolo: | Deuterated methanol toward NGC 7538-IRS1 | Autori: | Ospina-Zamudio, J. Favre, C. Kounkel, M. Xu, L. -H. Neill, J. Lefloch, B. Faure, A. Bergin, E. FEDELE , DAVIDE Hartmann, L. |
Data pubblicazione: | 2019 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 627 | Da pagina:: | A80 | Abstract: | We investigate the deuteration of methanol towards the high-mass star-forming region NGC 7538-IRS1. We carried out a multi-transition study of CH<SUB>3</SUB>OH, <SUP>13</SUP>CH<SUB>3</SUB>OH, and the deuterated flavors, CH<SUB>2</SUB>DOH and CH<SUB>3</SUB>OD, between 1.0 and 1.4 mm with the IRAM-30 m antenna. In total, 34 <SUP>13</SUP>CH<SUB>3</SUB>OH, 13 CH<SUB>2</SUB>DOH lines and 20 CH<SUB>3</SUB>OD lines spanning a wide range of upper-state energies (E<SUB>up</SUB>) were detected. From the detected transitions, we estimate that the measured D/H does not exceed 1%, with a measured CH<SUB>2</SUB>DOH/CH<SUB>3</SUB>OH and CH<SUB>3</SUB>OD/CH<SUB>3</SUB>OH of about (32 ± 8) × 10<SUP>-4</SUP> and (10 ± 4) × 10<SUP>-4</SUP>, respectively. This finding is consistent with the hypothesis of a short-timescale formation during the pre-stellar phase. We find a relative abundance CH<SUB>2</SUB>DOH/CH<SUB>3</SUB>OD ratio of 3.2 ± 1.5. This result is consistent with a statistical deuteration. We cannot exclude H/D exchanges between water and methanol if water deuteration is of the order 0.1%, as suggested by recent Herschel observations. <P />This paper is dedicated to the memory of our dear colleague, Dr. Li-Hong Xu, who recently passed away. | URI: | http://hdl.handle.net/20.500.12386/32416 | URL: | https://www.aanda.org/articles/aa/full_html/2019/07/aa34948-18/aa34948-18.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201834948 | Bibcode ADS: | 2019A&A...627A..80O | Fulltext: | open |
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