Article Dans Une Revue The Astrophysical Journal Letters Année : 2024

Rotational Spectrum and First Interstellar Detection of 2-methoxyethanol Using ALMA Observations of NGC 6334I

Samer El-Abd
  • Fonction : Auteur
Brian Hays
Steven Shipman
Maria Horne
  • Fonction : Auteur
Jes Jørgensen
  • Fonction : Auteur
Crystal Brogan
Todd Hunter
Anthony Remijan
Andrew Lipnicky
Ryan Loomis

Résumé

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 × 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.

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hal-04799020 , version 1 (16-05-2025)

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Zachary Fried, Samer El-Abd, Brian Hays, Gabi Wenzel, Alex Byrne, et al.. Rotational Spectrum and First Interstellar Detection of 2-methoxyethanol Using ALMA Observations of NGC 6334I. The Astrophysical Journal Letters, 2024, 965 (2), pp.L23. ⟨10.3847/2041-8213/ad37ff⟩. ⟨hal-04799020⟩
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