SIMBAD references

2019A&A...627A..80O - Astronomy and Astrophysics, volume 627A, 80-80 (2019/7-1)

Deuterated methanol toward NGC 7538-IRS1.

OSPINA-ZAMUDIO J., FAVRE C., KOUNKEL M., XU L.-H., NEILL J., LEFLOCH B., FAURE A., BERGIN E., FEDELE D. and HARTMANN L.

Abstract (from CDS):

We investigate the deuteration of methanol towards the high-mass star-forming region NGC 7538-IRS1. We carried out a multi-transition study of CH3OH, 13CH3OH, and the deuterated flavors, CH2DOH and CH3OD, between 1.0 and 1.4mm with the IRAM-30m antenna. In total, 34 13CH3OH, 13 CH2DOH lines and 20 CH3OD lines spanning a wide range of upper-state energies (Eup) were detected. From the detected transitions, we estimate that the measured D/H does not exceed 1%, with a measured CH2DOH/CH3OH and CH3OD/CH3OH of about (32±8)x10–4 and (10±4)x10–4, respectively. This finding is consistent with the hypothesis of a short-timescale formation during the pre-stellar phase. We find a relative abundance CH2DOH/CH3OD 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.

Abstract Copyright: © ESO 2019

Journal keyword(s): ISM: molecules - ISM: abundances - radio lines: ISM - astrochemistry - ISM: individual objects: NGC 7538

Simbad objects: 15

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2020.01.21-12:41:27

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