Academic Journal
Rotational Spectrum and First Interstellar Detection of 2-methoxyethanol Using ALMA Observations of NGC 6334I
| العنوان: | Rotational Spectrum and First Interstellar Detection of 2-methoxyethanol Using ALMA Observations of NGC 6334I |
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| المؤلفون: | Zachary T. P. Fried, Samer J. El-Abd, Brian M. Hays, Gabi Wenzel, Alex N. Byrne, Laurent Margulès, Roman A. Motiyenko, Steven T. Shipman, Maria P. Horne, Jes K. Jørgensen, Crystal L. Brogan, Todd R. Hunter, Anthony J. Remijan, Andrew Lipnicky, Ryan A. Loomis, Brett A. McGuire |
| المصدر: | The Astrophysical Journal Letters, Vol 965, Iss 2, p L23 (2024) |
| بيانات النشر: | IOP Publishing, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Astrophysics |
| مصطلحات موضوعية: | Interstellar molecules, Astrochemistry, Rotational spectroscopy, Astrophysics, QB460-466 |
| الوصف: | We use both chirped-pulse Fourier transform and frequency-modulated absorption spectroscopy to study the rotational spectrum of 2-methoxyethanol (CH _3 OCH _2 CH _2 OH) in several frequency regions ranging from 8.7 to 500 GHz. The resulting rotational parameters permitted a search for this molecule in Atacama Large Millimeter/submillimeter Array (ALMA) observations toward the massive protocluster NGC 6334I, as well as source B of the low-mass protostellar system IRAS 16293−2422. A total of 25 rotational transitions are observed in the ALMA Band 4 data toward NGC 6334I, resulting in the first interstellar detection of 2-methoxyethanol. A column density of ${1.3}_{-0.9}^{+1.4}\times {10}^{17}$ cm ^−2 is derived at an excitation temperature of ${143}_{-39}^{+31}$ K. However, molecular signal is not observed in the Band 7 data toward IRAS 16293−2422B, and an upper-limit column density of 2.5 × 10 ^15 cm ^−2 is determined. Various possible formation pathways—including radical recombination and insertion reactions—are discussed. We also investigate physical differences between the two interstellar sources that could result in the observed abundance variations. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2041-8213 2041-8205 |
| Relation: | https://doaj.org/toc/2041-8205 |
| DOI: | 10.3847/2041-8213/ad37ff |
| URL الوصول: | https://doaj.org/article/3df10404e1d541d093e23ac4f7eb84a8 |
| رقم الانضمام: | edsdoj.3df10404e1d541d093e23ac4f7eb84a8 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 20418213 20418205 |
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| DOI: | 10.3847/2041-8213/ad37ff |