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Article: A spectral line survey of NGC 7027 at millimeter wavelengths

TitleA spectral line survey of NGC 7027 at millimeter wavelengths
Authors
KeywordsISM: abundances
ISM: molecules
Planetary nebulae: individual (NGC 7027)
Radio lines: ISM
Issue Date2008
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2008, v. 678 n. 1, p. 328-346 How to Cite?
AbstractWe report on a recent spectral line survey of the planetary nebula (PN) NGC 7027 using the Arizona Radio Observatory (ARO) 12 m telescope and the Heinrich Hertz Submillimeter Telescope (SMT) at millimeter wavelengths. The spectra covering the frequency ranges 71-111, 157-161, and 218-267 GHz were obtained with a typical sensitivity of rms < 8 mK. A total of 67 spectral lines are detected, 21 of which are identified with 8 molecular species, 32 with recombination lines from hydrogen and helium, and 14 remain unidentified. As the widths of emission lines from CO, other neutral molecules, molecular ions, and recombination of H + and He - are found to be different from each other, the line strengths and profiles are used to investigate the physical conditions and chemical processes of the neutral envelope of NGC 7027. The column densities and fractional abundances relative to the H 2 of the observed molecular species are calculated and compared with predictions from chemical models. We found evidence for over- abundance Of N 2H + and underabundance of CS and HNC in NGC 7027, suggesting that X-ray emission and shock waves may play an important role in the chemistry of the hot molecular envelope of the young PN. © 2008. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/80842
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhang, Yen_HK
dc.contributor.authorKwok, Sen_HK
dc.contributor.authorDinhVTrungen_HK
dc.date.accessioned2010-09-06T08:10:52Z-
dc.date.available2010-09-06T08:10:52Z-
dc.date.issued2008en_HK
dc.identifier.citationAstrophysical Journal Letters, 2008, v. 678 n. 1, p. 328-346en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80842-
dc.description.abstractWe report on a recent spectral line survey of the planetary nebula (PN) NGC 7027 using the Arizona Radio Observatory (ARO) 12 m telescope and the Heinrich Hertz Submillimeter Telescope (SMT) at millimeter wavelengths. The spectra covering the frequency ranges 71-111, 157-161, and 218-267 GHz were obtained with a typical sensitivity of rms < 8 mK. A total of 67 spectral lines are detected, 21 of which are identified with 8 molecular species, 32 with recombination lines from hydrogen and helium, and 14 remain unidentified. As the widths of emission lines from CO, other neutral molecules, molecular ions, and recombination of H + and He - are found to be different from each other, the line strengths and profiles are used to investigate the physical conditions and chemical processes of the neutral envelope of NGC 7027. The column densities and fractional abundances relative to the H 2 of the observed molecular species are calculated and compared with predictions from chemical models. We found evidence for over- abundance Of N 2H + and underabundance of CS and HNC in NGC 7027, suggesting that X-ray emission and shock waves may play an important role in the chemistry of the hot molecular envelope of the young PN. © 2008. The American Astronomical Society. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsThe Astrophysical Journal. Copyright © Institute of Physics Publishing, Inc.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.subjectISM: abundancesen_HK
dc.subjectISM: moleculesen_HK
dc.subjectPlanetary nebulae: individual (NGC 7027)en_HK
dc.subjectRadio lines: ISMen_HK
dc.titleA spectral line survey of NGC 7027 at millimeter wavelengthsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=678&issue=1&spage=328&epage=346&date=2008&atitle=A+spectral+line+survey+of+NGC+7027+at+millimeter+wavelengths-
dc.identifier.emailZhang, Y: zhangy96@hku.hken_HK
dc.identifier.emailKwok, S: deannote@hku.hken_HK
dc.identifier.authorityZhang, Y=rp00841en_HK
dc.identifier.authorityKwok, S=rp00716en_HK
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1086/529428en_HK
dc.identifier.scopuseid_2-s2.0-44249109272en_HK
dc.identifier.hkuros142738en_HK
dc.identifier.volume678en_HK
dc.identifier.issue1en_HK
dc.identifier.spage328en_HK
dc.identifier.epage346en_HK
dc.identifier.eissn1538-4357-
dc.identifier.isiWOS:000255378300029-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhang, Y=23768446500en_HK
dc.identifier.scopusauthoridKwok, S=22980498300en_HK
dc.identifier.scopusauthoridDinhVTrung=6701469660en_HK

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