Titre :

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

Auteur(s) :

Fried, Zachary [Auteur]
El-Abd, Samer [Auteur]
Hays, Brian [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Wenzel, Gabi [Auteur]
Byrne, Alex [Auteur]
Margulès, Laurent [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Motiienko, Roman [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Shipman, Steven [Auteur]
Horne, Maria [Auteur]
Jørgensen, Jes [Auteur]
Brogan, Crystal [Auteur]
Hunter, Todd [Auteur]
Remijan, Anthony [Auteur]
Lipnicky, Andrew [Auteur]
Loomis, Ryan [Auteur]
Mcguire, Brett [Auteur]

Titre de la revue :

The Astrophysical Journal Letters

Pagination :

L23

Éditeur :

Bristol : IOP Publishing

Date de publication :

2024-04-12

ISSN :

2041-8205

Discipline(s) HAL :

Physique [physics]

Résumé en anglais : [en]

Abstract 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 ...
Lire la suite >Abstract 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.Lire moins >

Langue :

Anglais

Vulgarisation :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL

Date de dépôt :

2024-11-23T03:31:43Z