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Article: A spectral line survey of Orion KL in the bands 486-492 and 541-577 GHz with the Odin satellite: II. Data analysis

TitleA spectral line survey of Orion KL in the bands 486-492 and 541-577 GHz with the Odin satellite: II. Data analysis
Authors
KeywordsISM: abundances
ISM: individual objects: Orion KL
ISM: molecules
Line: formation
Line: identification
Submillimeter
Issue Date2007
PublisherEDP Sciences. The Journal's web site is located at http://www.aanda.org
Citation
Astronomy And Astrophysics, 2007, v. 476 n. 2, p. 807-827 How to Cite?
AbstractAims.We investigate the physical and chemical conditions in a typical star forming region, including an unbiased search for new molecules in a spectral region previously unobserved.Methods.Due to its proximity, the Orion KL region offers a unique laboratory of molecular astrophysics in a chemically rich, massive star forming region. Several ground-based spectral line surveys have been made, but due to the absorption by water and oxygen, the terrestrial atmosphere is completely opaque at frequencies around 487 and 557 GHz. To cover these frequencies we used the Odin satellite to perform a spectral line survey in the frequency ranges 486-492 GHz and 541-577 GHz, filling the gaps between previous spectral scans. Odin's high main beam efficiency, = 0.9, and observations performed outside the atmosphere make our intensity scale very well determined.Results.We observed 280 spectral lines from 38 molecules including isotopologues, and, in addition, 64 unidentified lines. A few U-lines have interesting frequency coincidences such as ND and the anion SH. The beam-averaged emission is dominated by CO, HO, SO, SO, CO and CHOH. Species with the largest number of lines are CHOH, (CHO, SO, CHOH, CHCN and NO. Six water lines are detected including the ground state rotational transition 1-1 of -HO, its isotopologues -HO and -HO, the Hot Core tracing -HO transition 6-7, and the 2-1 transition of HDO. Other lines of special interest are the 1-0 transition of NH and its isotopologue NH. Isotopologue abundance ratios of D/H, C/C, S/S, S/S, and O/O are estimated. The temperatures, column densities and abundances in the various subregions are estimated, and we find very high gas-phase abundances of HO, NH, SO, SO, NO, and CHOH. A comparison with the ice inventory of ISO sheds new light on the origin of the abundant gas-phase molecules.. © 2007 ESO.
Persistent Identifierhttp://hdl.handle.net/10722/80807
ISSN
2014 Impact Factor: 4.378
2015 SCImago Journal Rankings: 2.446
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorPersson, CMen_HK
dc.contributor.authorOlofsson, AOHen_HK
dc.contributor.authorKoning, Nen_HK
dc.contributor.authorBergman, Pen_HK
dc.contributor.authorBernath, Pen_HK
dc.contributor.authorBlack, JHen_HK
dc.contributor.authorFrisk, Uen_HK
dc.contributor.authorGeppert, Wen_HK
dc.contributor.authorHasegawa, TIen_HK
dc.contributor.authorHjalmarson, Åen_HK
dc.contributor.authorKwok, Sen_HK
dc.contributor.authorLarsson, Ben_HK
dc.contributor.authorLecacheux, Aen_HK
dc.contributor.authorNummelin, Aen_HK
dc.contributor.authorOlberg, Men_HK
dc.contributor.authorSandqvist, Aaen_HK
dc.contributor.authorWirström, ESen_HK
dc.date.accessioned2010-09-06T08:10:29Z-
dc.date.available2010-09-06T08:10:29Z-
dc.date.issued2007en_HK
dc.identifier.citationAstronomy And Astrophysics, 2007, v. 476 n. 2, p. 807-827en_HK
dc.identifier.issn0004-6361en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80807-
dc.description.abstractAims.We investigate the physical and chemical conditions in a typical star forming region, including an unbiased search for new molecules in a spectral region previously unobserved.Methods.Due to its proximity, the Orion KL region offers a unique laboratory of molecular astrophysics in a chemically rich, massive star forming region. Several ground-based spectral line surveys have been made, but due to the absorption by water and oxygen, the terrestrial atmosphere is completely opaque at frequencies around 487 and 557 GHz. To cover these frequencies we used the Odin satellite to perform a spectral line survey in the frequency ranges 486-492 GHz and 541-577 GHz, filling the gaps between previous spectral scans. Odin's high main beam efficiency, = 0.9, and observations performed outside the atmosphere make our intensity scale very well determined.Results.We observed 280 spectral lines from 38 molecules including isotopologues, and, in addition, 64 unidentified lines. A few U-lines have interesting frequency coincidences such as ND and the anion SH. The beam-averaged emission is dominated by CO, HO, SO, SO, CO and CHOH. Species with the largest number of lines are CHOH, (CHO, SO, CHOH, CHCN and NO. Six water lines are detected including the ground state rotational transition 1-1 of -HO, its isotopologues -HO and -HO, the Hot Core tracing -HO transition 6-7, and the 2-1 transition of HDO. Other lines of special interest are the 1-0 transition of NH and its isotopologue NH. Isotopologue abundance ratios of D/H, C/C, S/S, S/S, and O/O are estimated. The temperatures, column densities and abundances in the various subregions are estimated, and we find very high gas-phase abundances of HO, NH, SO, SO, NO, and CHOH. A comparison with the ice inventory of ISO sheds new light on the origin of the abundant gas-phase molecules.. © 2007 ESO.en_HK
dc.languageengen_HK
dc.publisherEDP Sciences. The Journal's web site is located at http://www.aanda.orgen_HK
dc.relation.ispartofAstronomy and Astrophysicsen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License The original publication is available at [http://www.aanda.org/]-
dc.subjectISM: abundancesen_HK
dc.subjectISM: individual objects: Orion KLen_HK
dc.subjectISM: moleculesen_HK
dc.subjectLine: formationen_HK
dc.subjectLine: identificationen_HK
dc.subjectSubmillimeteren_HK
dc.titleA spectral line survey of Orion KL in the bands 486-492 and 541-577 GHz with the Odin satellite: II. Data analysisen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-6361&volume=476&spage=807&epage=828&date=2007&atitle=A+Spectral+Line+Survey+of+Orion+Kl+in+the+Bands+486-492+and+541-577+Ghz+with+the+Odin+Satellite.+II.+Data+Analysisen_HK
dc.identifier.emailKwok, S: deannote@hku.hken_HK
dc.identifier.authorityKwok, S=rp00716en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1051/0004-6361:20077225en_HK
dc.identifier.scopuseid_2-s2.0-38049123683en_HK
dc.identifier.hkuros146057en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-38049123683&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume476en_HK
dc.identifier.issue2en_HK
dc.identifier.spage807en_HK
dc.identifier.epage827en_HK
dc.identifier.isiWOS:000251285000016-
dc.publisher.placeFranceen_HK
dc.identifier.scopusauthoridPersson, CM=36114949200en_HK
dc.identifier.scopusauthoridOlofsson, AOH=7006322972en_HK
dc.identifier.scopusauthoridKoning, N=15520613500en_HK
dc.identifier.scopusauthoridBergman, P=7006615192en_HK
dc.identifier.scopusauthoridBernath, P=35372923700en_HK
dc.identifier.scopusauthoridBlack, JH=25222377400en_HK
dc.identifier.scopusauthoridFrisk, U=8966521600en_HK
dc.identifier.scopusauthoridGeppert, W=7004178089en_HK
dc.identifier.scopusauthoridHasegawa, TI=7404173711en_HK
dc.identifier.scopusauthoridHjalmarson, Å=15744175200en_HK
dc.identifier.scopusauthoridKwok, S=22980498300en_HK
dc.identifier.scopusauthoridLarsson, B=7202678664en_HK
dc.identifier.scopusauthoridLecacheux, A=7003423533en_HK
dc.identifier.scopusauthoridNummelin, A=6603768944en_HK
dc.identifier.scopusauthoridOlberg, M=16201342800en_HK
dc.identifier.scopusauthoridSandqvist, Aa=35451841800en_HK
dc.identifier.scopusauthoridWirström, ES=14042809000en_HK

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