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Detection of HNC and tentative detection of CN at z=3.9

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dc.creator Guélin, Michel
dc.creator Salomé, P.
dc.creator Neri, Roberto
dc.creator García-Burillo, S.
dc.creator Graciá-Carpio, J.
dc.creator Cernicharo, José
dc.creator Cox, Pierre
dc.creator Planesas, P.
dc.creator Solomon, P. M.
dc.creator Tacconi, Linda J.
dc.creator Vanden Bout, P.
dc.date 2007-12-27T17:03:44Z
dc.date 2007-12-27T17:03:44Z
dc.date 2006-12-13
dc.date.accessioned 2017-01-31T00:59:33Z
dc.date.available 2017-01-31T00:59:33Z
dc.identifier arXiv:astro-ph/0612345v1
dc.identifier Astronomy and Astrophysics Letters
dc.identifier 1432-0746
dc.identifier http://hdl.handle.net/10261/2624
dc.identifier 10.1051/0004-6361:20066555
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2624
dc.description Accepted for publication in Astronomy and Astrophysics Letters (A&ALetters). Acceptance date: 7th December 2006.
dc.description Molecular line emission from high-redshift galaxies holds great promise for the study of galaxy formation and evolution. The weak signals can only be detected with the largest mm-wave telescopes, such as the IRAM interferometer. We report the detection of the J = 5-4 line of HNC and the tentative detection of the N= 4-3 line of CN in the quasar APM08279+5255 at z=3.9. These are the 4th and 5th molecular species detected at such a high redshift. The derived HNC and CN line intensities are 0.6 and 0.4 times that of HCN J= 5-4. If HNC and HCN are co-spatial and if their J= 5-4 lines are collisionally excited, the [HNC]/[HCN] abundance ratio must be equal to 0.6 within a factor of 2, similar to its value in the cold Galactic clouds and much larger than in the hot molecular gas associated with Galactic HII regions. It is possible, however, that fluorescent infrared radiation plays an important role in the excitation of HNC and HCN.
dc.description IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).
dc.description Peer reviewed
dc.format 818008 bytes
dc.format application/pdf
dc.language eng
dc.publisher EDP Sciences
dc.relation Preprint
dc.rights openAccess
dc.subject Galaxies: high redshift, abundances
dc.subject Galaxies: Individual: APM 08279+5255
dc.subject Techniques: interferometric
dc.title Detection of HNC and tentative detection of CN at z=3.9
dc.type Pre-print


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