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Article: Molecular line emissions from the photodissociation region of NGC 7027

TitleMolecular line emissions from the photodissociation region of NGC 7027
Authors
KeywordsIsm: Molecules
Planetary Nebulae: Individual (Ngc 7027)
Radio Lines: Ism
Issue Date2001
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X
Citation
The Astrophysical Journal, 2001, v. 562 n. 2 pt. 1, p. 824-841 How to Cite?
AbstractWe have observed or searched for 11 molecular species in 17 transitions in the 200 and 300 GHz bands in the young planetary nebula NGC 7027. The results include a first detection of C 2H in this source. The observed spectra of HCO +, H 13CO +, HCN, CN, C 2H, and CO + show line widths wider than that of bulk CO emission but coincident with the full width at detection limit of weak wings in CO spectra. The HCO +, HCN, and CN emitting regions have a size of about 13″, significantly smaller than that of the CO emitting region. Thus, the emission of all the observed molecules other than CO and 13CO must originate from a very small volume compared with the entire CO envelope. Excitation analyses of six molecules with electron and neutral collisions at a gas temperature of 800 K yield similar density estimates ranging from 1.3 to 5 × 10 5 cm -3. Estimated column densities for HCO +, HCN, CN, CO +, and C 2H are in good agreement with predictions by a chemical model for the photodissociation region of NGC 7027. These analyses suggest that photochemistry is active in NGC 7027 and the observed molecular emissions (except CO) originate from the H 2 photodissociation zone of the object. © 2001. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/179646
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHasegawa, TIen_US
dc.contributor.authorKwok, Sen_US
dc.date.accessioned2012-12-19T10:02:14Z-
dc.date.available2012-12-19T10:02:14Z-
dc.date.issued2001en_US
dc.identifier.citationThe Astrophysical Journal, 2001, v. 562 n. 2 pt. 1, p. 824-841en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/179646-
dc.description.abstractWe have observed or searched for 11 molecular species in 17 transitions in the 200 and 300 GHz bands in the young planetary nebula NGC 7027. The results include a first detection of C 2H in this source. The observed spectra of HCO +, H 13CO +, HCN, CN, C 2H, and CO + show line widths wider than that of bulk CO emission but coincident with the full width at detection limit of weak wings in CO spectra. The HCO +, HCN, and CN emitting regions have a size of about 13″, significantly smaller than that of the CO emitting region. Thus, the emission of all the observed molecules other than CO and 13CO must originate from a very small volume compared with the entire CO envelope. Excitation analyses of six molecules with electron and neutral collisions at a gas temperature of 800 K yield similar density estimates ranging from 1.3 to 5 × 10 5 cm -3. Estimated column densities for HCO +, HCN, CN, CO +, and C 2H are in good agreement with predictions by a chemical model for the photodissociation region of NGC 7027. These analyses suggest that photochemistry is active in NGC 7027 and the observed molecular emissions (except CO) originate from the H 2 photodissociation zone of the object. © 2001. The American Astronomical Society. All rights reserved.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637Xen_US
dc.relation.ispartofThe Astrophysical Journalen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectIsm: Moleculesen_US
dc.subjectPlanetary Nebulae: Individual (Ngc 7027)en_US
dc.subjectRadio Lines: Ismen_US
dc.titleMolecular line emissions from the photodissociation region of NGC 7027en_US
dc.typeArticleen_US
dc.identifier.emailKwok, S: deannote@hku.hken_US
dc.identifier.authorityKwok, S=rp00716en_US
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1086/323856en_US
dc.identifier.scopuseid_2-s2.0-0012694784en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0012694784&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume562en_US
dc.identifier.issue2 pt. 1en_US
dc.identifier.spage824en_US
dc.identifier.epage841en_US
dc.identifier.isiWOS:000172572600022-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridHasegawa, TI=7404173711en_US
dc.identifier.scopusauthoridKwok, S=22980498300en_US

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