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Article: The detection of a molecular bipolar flow in the multipolar planetary nebula NGC 2440

TitleThe detection of a molecular bipolar flow in the multipolar planetary nebula NGC 2440
Authors
KeywordsISM: molecules
Planetary nebulae: individual (NGC 2440)
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. 673 n. 1, p. 264-270 How to Cite?
AbstractWe report the detection of a molecular bipolar outflow in the CO J = 3-2 line in the optical multipolar planetary nebula NGC 2440. The observed CO J = 3-2 emission shows two major velocity components which are blue- and redshifted by 18 km s -1 relative to the systemic velocity of PLSR = 43 km s -1. Both components are detected only near the central region and have a size of about 24″. In addition to this bulk motion, weak CO emissions in the central region are detected at higher velocities of ±20 to ±40 km s -1. The presence of the fast CO components are in line with the picture that the neutral dense torus is being torn apart by very fast outflowing winds. The spatial distribution of CO emission shows two emission peaks at the systemic velocity that are located 30″ to the northeast and 30″ to the south-west from the center in point symmetry. The positions of the two CO emission peaks coincide well with the emission knots in the optical, suggesting that the CO outflow corresponds to one pair of the multiple optical bipolar lobes of the nebula. This particular pair of bipolar lobes seem distinctly rich in heavy molecules compared with the other optical bipolar lobes. The extent of CO emission in NGC 2440 is well constrained. The total amount of CO molecules in NGC 2440 is 3.5 × 10 51 if the distance to NGC 2440 is 2.19 kpc and the excitation temperature is 25 K. © 2008. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/80729
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, MYen_HK
dc.contributor.authorHasegawa, TIen_HK
dc.contributor.authorKwok, Sen_HK
dc.date.accessioned2010-09-06T08:09:38Z-
dc.date.available2010-09-06T08:09:38Z-
dc.date.issued2008en_HK
dc.identifier.citationAstrophysical Journal Letters, 2008, v. 673 n. 1, p. 264-270en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80729-
dc.description.abstractWe report the detection of a molecular bipolar outflow in the CO J = 3-2 line in the optical multipolar planetary nebula NGC 2440. The observed CO J = 3-2 emission shows two major velocity components which are blue- and redshifted by 18 km s -1 relative to the systemic velocity of PLSR = 43 km s -1. Both components are detected only near the central region and have a size of about 24″. In addition to this bulk motion, weak CO emissions in the central region are detected at higher velocities of ±20 to ±40 km s -1. The presence of the fast CO components are in line with the picture that the neutral dense torus is being torn apart by very fast outflowing winds. The spatial distribution of CO emission shows two emission peaks at the systemic velocity that are located 30″ to the northeast and 30″ to the south-west from the center in point symmetry. The positions of the two CO emission peaks coincide well with the emission knots in the optical, suggesting that the CO outflow corresponds to one pair of the multiple optical bipolar lobes of the nebula. This particular pair of bipolar lobes seem distinctly rich in heavy molecules compared with the other optical bipolar lobes. The extent of CO emission in NGC 2440 is well constrained. The total amount of CO molecules in NGC 2440 is 3.5 × 10 51 if the distance to NGC 2440 is 2.19 kpc and the excitation temperature is 25 K. © 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 © University of Chicago Press.en_HK
dc.subjectISM: moleculesen_HK
dc.subjectPlanetary nebulae: individual (NGC 2440)en_HK
dc.titleThe detection of a molecular bipolar flow in the multipolar planetary nebula NGC 2440en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=673&spage=264–270&epage=&date=2008&atitle=The+Detection+of+a+Molecular+Bipolar+Flow+in+the+Multipolar+Planetary+Nebula+NGC+2440en_HK
dc.identifier.emailKwok, S: deannote@hku.hken_HK
dc.identifier.authorityKwok, S=rp00716en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1086/524185en_HK
dc.identifier.scopuseid_2-s2.0-40249118343en_HK
dc.identifier.hkuros146070en_HK
dc.identifier.volume673en_HK
dc.identifier.issue1en_HK
dc.identifier.spage264en_HK
dc.identifier.epage270en_HK
dc.identifier.isiWOS:000253454200022-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridWang, MY=15521077400en_HK
dc.identifier.scopusauthoridHasegawa, TI=7404173711en_HK
dc.identifier.scopusauthoridKwok, S=22980498300en_HK

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