High-Resolution CO and H[TINF]2[/TINF] Molecular Line Imaging of a Cometary Globule in the Helix Nebula | Zendy

P. J. Huggins | Zendy; T. Forveille | Zendy; R. Bachiller | Zendy; P. Cox | Zendy; N. Ageorges | Zendy; J. R. Walsh | Zendy

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High-Resolution CO and H[TINF]2[/TINF] Molecular Line Imaging of a Cometary Globule in the Helix Nebula

Author(s) -

P. J. Huggins,

T. Forveille,

R. Bachiller,

P. Cox,

N. Ageorges,

J. R. Walsh

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/342021

Subject(s) - nebula , physics , line (geometry) , astrophysics , emission spectrum , planetary nebula , resolution (logic) , emission nebula , astronomy , spectral line , stars , geometry , mathematics , artificial intelligence , computer science

We report high resolution imaging of a prominent cometary globule in theHelix nebula in the CO J=1-0 (2.6 mm) and H2 v=1-0 S(1) (2.12 micron) lines.The observations confirm that globules consist of dense condensations ofmolecular gas embedded in the ionized nebula. The head of the globule is seenas a peak in the CO emission with an extremely narrow line width (0.5 km/s) andis outlined by a limb-brightened surface of H2 emission facing the central starand lying within the photo-ionized halo. The emission from both molecularspecies extends into the tail region. The presence of this extended molecularemission provides new constraints on the structure of the tails, and on theorigin and evolution of the globules.Comment: 12 pages, 3 figures. To appear in The Astrophysical Journal Letter

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