The J_2_-J_1_ E methanol transitions for J>=12 in Orion KL.

Details The J_2_-J_1_ E methanol transitions for J>=12 in Orion KL. The J_2_-J_1_ E methanol transitions for J>=12 in Orion KL.

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...307..209w&link_type=abstract

Astronomy and Astrophysics, v.307, p.209

Astronomy and Astrophysics

Astrophysics

2

Masers, Molecular Data, Ism: Individual: Orion Kl, Molecules, Radio Lines: Ism

Scientific paper

The first astronomical measurements of the J_k_=12_2_-12_1_, 14_2_-14_1_, 15_2_-15_1_, 16_2_-16_1_, and 17_2_-17_1_ transitions of E type methanol are presented. Corrections to the line rest frequencies are significant. A map of the averaged J=15 to 17 lines shows that the emission arises from a region of 35"(δ) by ~20"(α) FWHP size, centered ~7" south, <2" west of the Hot Core. This is the Methanol Emission Center; the most intense CH_3_OH masers are 15" to the NW. The J>=12 profiles are adequately fitted with two gaussian velocity components with FWHP {DELTA}v_1/2_=~0.8km/s and =~3km/s. For the wider component, our data give a rotational temperature of ~100K. Excitation calculations indicate that the J_2_-J_1_ populations are inverted; the narrow velocity component in the J=15 to 17 transitions may be a low gain maser.

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