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    Evidence for the Naphthalene Cation in a Region of the Interstellar Medium with Anomalous Microwave Emission

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    Date
    2008-09
    Author
    Iglesias-Groth, S.
    Manchado, A.
    Garcia-Hernandez, D. A.
    Hernandez, J. I. G.
    Lambert, David L.
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    Abstract
    We report high-resolution spectroscopy of the moderately reddened (A(v) = 3) early-type star Cernis 52 located in a region of the Perseus molecular cloud complex with anomalous microwave emission. In addition to the presence of the most common diffuse interstellar bands (DIBs) we detect two new interstellar or circumstellar bands coincident to within 0.01% in wavelength with the two strongest bands of the naphthalene cation (C(10)H(8)(+)) as measured in gas-phase laboratory spectroscopy at low temperatures and find marginal evidence for the third strongest band. Assuming these features are caused by the naphthalene cation, from the measured intensity and available oscillator strengths we find that 0.008% of the carbon in the cloud could be in the form of this molecule. We expect hydrogen additions to cause hydronaphthalene cations to be abundant in the cloud and to contribute via electric dipole radiation to the anomalous microwave emission. The identification of new interstellar features consistent with transitions of the simplest polycyclic aromatic hydrocarbon adds support to the hypothesis that this type of molecules are the carriers of both diffuse interstellar bands and anomalous microwave emission.
    Department
    McDonald Observatory
    Subject
    ism: abundances
    ism: lines and bands
    ism: molecules
    polycyclic aromatic-hydrocarbons
    galactic emission
    spinning dust
    bands
    spectroscopy
    fulleranes
    latitude
    grains
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/43098
    xmlui.dri2xhtml.METS-1.0.item-citation
    Iglesias-Groth, S., A. Manchado, D. A. García-Hernández, JI González Hernández, and D. L. Lambert. "Evidence for the naphthalene cation in a region of the interstellar medium with anomalous microwave emission." The Astrophysical Journal Letters, Vol. 685, No. 1 (Sep., 2008): L55.
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