Torsionally Excited Methyl Formate in Orion KL | Zendy

Kaori Kobayashi | Zendy; Kazumi Ogata | Zendy; Shozo Tsunekawa | Zendy; Shuro Takano | Zendy

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Torsionally Excited Methyl Formate in Orion KL

Author(s) -

Kaori Kobayashi,

Kazumi Ogata,

Shozo Tsunekawa,

Shuro Takano

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/512977

Subject(s) - excited state , physics , methyl formate , ground state , spectral line , atomic physics , line (geometry) , orion nebula , astrophysics , astronomy , chemistry , stars , methanol , geometry , organic chemistry , mathematics

We report the first detection of rotational transitions of methyl formate (HCOOCH3) in the first torsionally excited state (vt = 1). Recent progress on assignment of the methyl formate spectra in laboratory made it possible to assign about 20 unidentified lines in Orion KL from previous line surveys below 200 GHz to the first torsionally excited methyl formate. The obtained rotational temperature and the column density in the first torsionally excited state were 44 ± 10 K and (8.6 ± 3.2) × 1014 cm−2, respectively. They were compared with those in the ground state.

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