A Spectral Line Survey from 159.7 to 164.7 GHz Toward Orion-KL: The Data

Details A Spectral Line Survey from 159.7 to 164.7 GHz Toward Orion-KL: The Data A Spectral Line Survey from 159.7 to 164.7 GHz Toward Orion-KL: The Data

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jkas...35..187l&link_type=abstract

Journal of the Korean Astronomical Society, vol. 35, no. 4, pp. 187-196

Astronomy and Astrophysics

Astronomy

6

Ism: Individual (Orion-Kl), Ism: Molecules, Line: Identification, Radio Line: Molecular: Interstellar

Scientific paper

A spectral line survey is performed from 159.7 to 164.7 GHz toward Orion-KL, as an extension of our previous line survey from 138.3 to 150.7 GHz with the same 14 m radio telescope of Taeduk Radio Astronomy Observatory. Typical system temperatures were 260 - 1000 K to achieve a sensitivity of about 0.02 - 0.04 K in TA* unit. A total of 63 line spectra are detected in this survey. Among them, 54 lines are found to be the first detections towards an astronomical source and only 9 spectral lines have been previously identified from other observations. Forty-eight of 54 lines are believed to be from the known transitions of the known molecules, while 6 lines are `unidentified'. All detected lines are found to be from a total of 10 molecular species and their isotopic variants. The molecular species with most numerous detected transitions are HCOOCH3 (22), followed by CH3OCH3 (7), C2H5CN (7), and SO2 (6). The LTE rotation diagram analysis using all homogeneous data with those from previous survey gives more reliable determination of physical quantities. The derived values of the rotation temperatures and column densities for HCOOCH3, CH3OCH3, and SO2 are 75~ 197 K and 1.5~ 18× 1015 cm-2, respectively.

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