Detection of HCN Direct l-Type Transitions Probing Hot Molecular Gas in the Proto-Planetary Nebula CRL 618

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dc.creatorThorwirth, S.
dc.creatorWyrowski, F.
dc.creatorSchilke, P.
dc.creatorMenten, K. M.
dc.creatorBruenken, S.
dc.creatorMueller, H. S. P.
dc.creatorWinnewisser, G.
dc.date2002-11-27
dc.date.accessioned2026-07-07T10:31:28Z
dc.date.available2026-07-07T10:31:28Z
dc.descriptionWe report the detection of direct l-type transitions towards the proto-planetary nebula CRL 618 during a study of vibrationally excited carbon chains. The J=8,10,11,12,13,14 DJ=0 transitions of HCN in its first excited bending mode v2=1 were detected in absorption against the continuum of the central HII region making use of the Effelsberg 100m telescope and the Very Large Array. Additionally, the J=9 direct l-type transition was detected in emission presumably indicating a weak maser. All lines are blueshifted with respect to the systemic velocity of CRL 618 indicating that the lines originate from a hot, expanding circumstellar envelope. The HCN column density along the line of sight in front of the continuum is 2E18 cm^-2.
dc.description14 pages, 4 figures, to appear in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0211594
dc.identifierhttp://arxiv.org/abs/astro-ph/0211594
dc.identifierAstrophys.J.586:338-343,2003
dc.identifierdoi:10.1086/367629
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178424
dc.subjectAstrophysics
dc.titleDetection of HCN Direct l-Type Transitions Probing Hot Molecular Gas in the Proto-Planetary Nebula CRL 618
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