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Detection of HCN Direct l-Type Transitions Probing Hot Molecular Gas in the Proto-Planetary Nebula CRL 618 | | S. Thorwirth
; F. Wyrowski
; P. Schilke
; K.M. Menten
; S. Bruenken
; H.S.P. Mueller
; G. Winnewisser
; | | Date: |
27 Nov 2002 | | Journal: | Astrophys.J. 586 (2003) 338-343 | | Subject: | astro-ph | | Abstract: | We 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. | | Source: | arXiv, astro-ph/0211594 | | Services: | Forum | Review | PDF | Favorites | |
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