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Article: Massive expanding torus and east outflow in planetary nebula NGC 6302

TitleMassive expanding torus and east outflow in planetary nebula NGC 6302
Authors
KeywordsCircumstellar Matter
Planetary Nebulae: Individual (Noc 6302)
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. 2, p. 934-941 How to Cite?
AbstractWe present interferometric observations of 12CO and 13CO J = 2-1 emission from the butterfly-shaped, young planetary nebula NGC 6302. The high angular resolution and high sensitivity achieved in our observations allow us to resolve the nebula into two distinct kinematic components: (1) a massive expanding torus seen almost edge-on and oriented in the north-south direction (roughly perpendicular to the optical nebula axis), which exhibits very complex and fragmented structure; and (2) high-velocity molecular knots moving at more than 20 km s-1 and located in the optical bipolar lobes. These knots show a linear position-velocity gradient (Hubble-like now), which is characteristic of fast molecular outflow in young planetary nebulae. From the low but variable 12CO/13CO J = 2-1 line intensity ratio, we conclude that the 12CO J = 2-1 emission is optically thick over much of the nebula. Using the optically thinner line 13CO J = 2-1, we estimate a total molecular gas mass of ∼0.1 M⊙, comparable to the ionized gas mass; the total gas mass of the NOC 6302 nebula, including the massive ionized gas from the photon dominated region, is found to be ∼0.5 M⊙. From radiative transfer modeling, we infer that the torus is seen at an inclination angle of 75° with respect to the plane of the sky, and is expanding at a velocity of 15 km s-1. Comparison with recent observations of molecular gas in NGC 6302 is also discussed. © 2008. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/175110
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369

 

DC FieldValueLanguage
dc.contributor.authorDinhVTrungen_US
dc.contributor.authorBujarrabal, Ven_US
dc.contributor.authorCastroCarrizo, Aen_US
dc.contributor.authorLim, Jen_US
dc.contributor.authorKwok, Sen_US
dc.date.accessioned2012-11-26T08:49:16Z-
dc.date.available2012-11-26T08:49:16Z-
dc.date.issued2008en_US
dc.identifier.citationAstrophysical Journal Letters, 2008, v. 673 n. 2, p. 934-941en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/175110-
dc.description.abstractWe present interferometric observations of 12CO and 13CO J = 2-1 emission from the butterfly-shaped, young planetary nebula NGC 6302. The high angular resolution and high sensitivity achieved in our observations allow us to resolve the nebula into two distinct kinematic components: (1) a massive expanding torus seen almost edge-on and oriented in the north-south direction (roughly perpendicular to the optical nebula axis), which exhibits very complex and fragmented structure; and (2) high-velocity molecular knots moving at more than 20 km s-1 and located in the optical bipolar lobes. These knots show a linear position-velocity gradient (Hubble-like now), which is characteristic of fast molecular outflow in young planetary nebulae. From the low but variable 12CO/13CO J = 2-1 line intensity ratio, we conclude that the 12CO J = 2-1 emission is optically thick over much of the nebula. Using the optically thinner line 13CO J = 2-1, we estimate a total molecular gas mass of ∼0.1 M⊙, comparable to the ionized gas mass; the total gas mass of the NOC 6302 nebula, including the massive ionized gas from the photon dominated region, is found to be ∼0.5 M⊙. From radiative transfer modeling, we infer that the torus is seen at an inclination angle of 75° with respect to the plane of the sky, and is expanding at a velocity of 15 km s-1. Comparison with recent observations of molecular gas in NGC 6302 is also discussed. © 2008. 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/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.rightsThe Astrophysical Journal. Copyright © University of Chicago Press.-
dc.subjectCircumstellar Matteren_US
dc.subjectPlanetary Nebulae: Individual (Noc 6302)en_US
dc.titleMassive expanding torus and east outflow in planetary nebula NGC 6302en_US
dc.typeArticleen_US
dc.identifier.emailLim, J: jjlim@hku.hken_US
dc.identifier.emailKwok, S: deannote@hku.hken_US
dc.identifier.authorityLim, J=rp00745en_US
dc.identifier.authorityKwok, S=rp00716en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1086/524373en_US
dc.identifier.scopuseid_2-s2.0-40249083100en_US
dc.identifier.hkuros146075-
dc.identifier.volume673en_US
dc.identifier.issue2en_US
dc.identifier.spage934en_US
dc.identifier.epage941en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridDinhVTrung=6701469660en_US
dc.identifier.scopusauthoridBujarrabal, V=7003330193en_US
dc.identifier.scopusauthoridCastroCarrizo, A=6603125220en_US
dc.identifier.scopusauthoridLim, J=7403453870en_US
dc.identifier.scopusauthoridKwok, S=22980498300en_US

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