Detection of the linear radical HC4N in IRC+10216

J. Cernicharo; M. Guelin; J. R. Pardo

doi:10.1086/426439

Detection of the linear radical HC4N in IRC+10216

Astrophysics 2009-11-10 v1

Authors: J. Cernicharo , M. Guelin , J. R. Pardo

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Abstract

We report the detection of the linear radical HC4N in the C-rich envelope of IRC+10216. After HCCN, HC4N is the second member of the allenic chain family HC_(2n)N observed in space. The column density of HC4N is found to be 1.5 10**12 cm**(-2). The abundance ratio HC2N/HC4N is 9, a factor of two larger than the decrement observed for the cyanopolyynes HC$_(2n+1)N/HC_(2n+3)N. Linear HC_4N has a 3-Sigma electronic ground state and is one of the 3 low-energy isomeric forms of this molecule. We have searched for the bent and ringed HC4N isomers, but could only derive an upper limit to their column densities of about 3 10**(12) cm**(-2).

Keywords

HC4N IRC+10216 cyanopolyynes column density isomeric forms

Cite

@article{arxiv.astro-ph/0410657,
  title  = {Detection of the linear radical HC4N in IRC+10216},
  author = {J. Cernicharo and M. Guelin and J. R. Pardo},
  journal= {arXiv preprint arXiv:astro-ph/0410657},
  year   = {2009}
}

Comments

Preprint of 10 pages

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