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dc.contributor.authorGuélin, Michel-
dc.contributor.authorSalomé, P.-
dc.contributor.authorNeri, Roberto-
dc.contributor.authorGarcía-Burillo, S.-
dc.contributor.authorGraciá-Carpio, J.-
dc.contributor.authorCernicharo, José-
dc.contributor.authorCox, Pierre-
dc.contributor.authorPlanesas, P.-
dc.contributor.authorSolomon, P. M.-
dc.contributor.authorTacconi, Linda J.-
dc.contributor.authorVanden Bout, P.-
dc.identifier.citationAstronomy and Astrophysics Lettersen_US
dc.descriptionAccepted for publication in Astronomy and Astrophysics Letters (A&ALetters). Acceptance date: 7th December 2006.en_US
dc.description.abstractMolecular 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.en_US
dc.description.sponsorshipIRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).en_US
dc.format.extent818008 bytes-
dc.publisherEDP Sciencesen_US
dc.subjectGalaxies: high redshift, abundancesen_US
dc.subjectGalaxies: Individual: APM 08279+5255en_US
dc.subjectTechniques: interferometricen_US
dc.titleDetection of HNC and tentative detection of CN at z=3.9en_US
dc.description.peerreviewedPeer revieweden_US
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