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

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dc.contributor.utaustinauthorLambert, D. L.en_US
dc.creatorIglesias-Groth, S.en_US
dc.creatorManchado, A.en_US
dc.creatorGarcia-Hernandez, D. A.en_US
dc.creatorHernandez, J. I. G.en_US
dc.creatorLambert, David L.en_US
dc.date.accessioned2016-10-28T19:38:06Z
dc.date.available2016-10-28T19:38:06Z
dc.date.issued2008-09en_US
dc.description.abstractWe 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.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipEU MEXT-CT-2004-014265en_US
dc.description.sponsorshipSpanish Ministry of Education and Science AYA2007-64748en_US
dc.identifierdoi:10.15781/T23J3938K
dc.identifier.citationIglesias-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.en_US
dc.identifier.doi10.1086/592349en_US
dc.identifier.issnen_US
dc.identifier.urihttp://hdl.handle.net/2152/43098
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journal Lettersen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectism: abundancesen_US
dc.subjectism: lines and bandsen_US
dc.subjectism: moleculesen_US
dc.subjectpolycyclic aromatic-hydrocarbonsen_US
dc.subjectgalactic emissionen_US
dc.subjectspinning dusten_US
dc.subjectbandsen_US
dc.subjectspectroscopyen_US
dc.subjectfulleranesen_US
dc.subjectlatitudeen_US
dc.subjectgrainsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleEvidence for the Naphthalene Cation in a Region of the Interstellar Medium with Anomalous Microwave Emissionen_US
dc.typeArticleen_US

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