The spectrum of Orion-KL at 2 millimeters (150-160 GHz).

Lucy M Ziurys, D. McGonagle

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

A spectral survey of Orion-KL has been carried out in the 2 mm atmospheric window in the frequency range 149.6-159.6 GHz, using the FCRAO 14 m telescope. Typical sensitivities achieved were T*A approximately 0.03-0.1 K, peak-to-peak. Over 180 spectral lines were detected, including approximately 45 unidentified features. The spectra were measured with a single-sideband receiver and, even at levels of T*A approximately 30 mK, are far from being confusion-limited. Fifteen known species were conclusively identified in Orion in this spectral region, with the largest numbers of lines arising from methyl formate, ethyl cyanide, methanol, and dimethyl ether. These species have beam-averaged column densities of N(tot) approximately 0.5-8 x 10(15) cm-2. Several other species have been tentatively observed, including acetaldehyde, C2S, and possibly EtOH. The large organic species, however, appear to arise from different regions. For example, CH3CCH and (CH3)2O come primarily from the extended ridge, while EtCN and VyCN exclusively arise in the hot core. This survey clearly demonstrates that the 2 mm window is rich in spectral lines. It also suggests there is much chemical selectivity in the formation of large organic interstellar molecules.

Original languageEnglish (US)
Pages (from-to)155-187
Number of pages33
JournalThe Astrophysical journal. Supplement series
Volume89
Issue number1
StatePublished - Nov 1993
Externally publishedYes

Fingerprint

line spectra
atmospheric windows
acetaldehyde
confusion
formates
cyanides
sidebands
ridges
ethers
methyl alcohol
receivers
selectivity
frequency ranges
telescopes
sensitivity
cyanide
ether
methanol
molecules

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

The spectrum of Orion-KL at 2 millimeters (150-160 GHz). / Ziurys, Lucy M; McGonagle, D.

In: The Astrophysical journal. Supplement series, Vol. 89, No. 1, 11.1993, p. 155-187.

Research output: Contribution to journalArticle

@article{1d6da16aef2f44e8b56adaa02272c403,
title = "The spectrum of Orion-KL at 2 millimeters (150-160 GHz).",
abstract = "A spectral survey of Orion-KL has been carried out in the 2 mm atmospheric window in the frequency range 149.6-159.6 GHz, using the FCRAO 14 m telescope. Typical sensitivities achieved were T*A approximately 0.03-0.1 K, peak-to-peak. Over 180 spectral lines were detected, including approximately 45 unidentified features. The spectra were measured with a single-sideband receiver and, even at levels of T*A approximately 30 mK, are far from being confusion-limited. Fifteen known species were conclusively identified in Orion in this spectral region, with the largest numbers of lines arising from methyl formate, ethyl cyanide, methanol, and dimethyl ether. These species have beam-averaged column densities of N(tot) approximately 0.5-8 x 10(15) cm-2. Several other species have been tentatively observed, including acetaldehyde, C2S, and possibly EtOH. The large organic species, however, appear to arise from different regions. For example, CH3CCH and (CH3)2O come primarily from the extended ridge, while EtCN and VyCN exclusively arise in the hot core. This survey clearly demonstrates that the 2 mm window is rich in spectral lines. It also suggests there is much chemical selectivity in the formation of large organic interstellar molecules.",
author = "Ziurys, {Lucy M} and D. McGonagle",
year = "1993",
month = "11",
language = "English (US)",
volume = "89",
pages = "155--187",
journal = "Astrophysical Journal, Supplement Series",
issn = "0067-0049",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - The spectrum of Orion-KL at 2 millimeters (150-160 GHz).

AU - Ziurys, Lucy M

AU - McGonagle, D.

PY - 1993/11

Y1 - 1993/11

N2 - A spectral survey of Orion-KL has been carried out in the 2 mm atmospheric window in the frequency range 149.6-159.6 GHz, using the FCRAO 14 m telescope. Typical sensitivities achieved were T*A approximately 0.03-0.1 K, peak-to-peak. Over 180 spectral lines were detected, including approximately 45 unidentified features. The spectra were measured with a single-sideband receiver and, even at levels of T*A approximately 30 mK, are far from being confusion-limited. Fifteen known species were conclusively identified in Orion in this spectral region, with the largest numbers of lines arising from methyl formate, ethyl cyanide, methanol, and dimethyl ether. These species have beam-averaged column densities of N(tot) approximately 0.5-8 x 10(15) cm-2. Several other species have been tentatively observed, including acetaldehyde, C2S, and possibly EtOH. The large organic species, however, appear to arise from different regions. For example, CH3CCH and (CH3)2O come primarily from the extended ridge, while EtCN and VyCN exclusively arise in the hot core. This survey clearly demonstrates that the 2 mm window is rich in spectral lines. It also suggests there is much chemical selectivity in the formation of large organic interstellar molecules.

AB - A spectral survey of Orion-KL has been carried out in the 2 mm atmospheric window in the frequency range 149.6-159.6 GHz, using the FCRAO 14 m telescope. Typical sensitivities achieved were T*A approximately 0.03-0.1 K, peak-to-peak. Over 180 spectral lines were detected, including approximately 45 unidentified features. The spectra were measured with a single-sideband receiver and, even at levels of T*A approximately 30 mK, are far from being confusion-limited. Fifteen known species were conclusively identified in Orion in this spectral region, with the largest numbers of lines arising from methyl formate, ethyl cyanide, methanol, and dimethyl ether. These species have beam-averaged column densities of N(tot) approximately 0.5-8 x 10(15) cm-2. Several other species have been tentatively observed, including acetaldehyde, C2S, and possibly EtOH. The large organic species, however, appear to arise from different regions. For example, CH3CCH and (CH3)2O come primarily from the extended ridge, while EtCN and VyCN exclusively arise in the hot core. This survey clearly demonstrates that the 2 mm window is rich in spectral lines. It also suggests there is much chemical selectivity in the formation of large organic interstellar molecules.

UR - http://www.scopus.com/inward/record.url?scp=34547650134&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34547650134&partnerID=8YFLogxK

M3 - Article

C2 - 11539839

AN - SCOPUS:34547650134

VL - 89

SP - 155

EP - 187

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

SN - 0067-0049

IS - 1

ER -