Evidence for the naphthalene cation in a region of the interstellar medium with anomalous microwave emission - AstrophysicsReport as inadecuate




Evidence for the naphthalene cation in a region of the interstellar medium with anomalous microwave emission - Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We report high resolution spectroscopy of the moderately reddened A$ V$=3early type star Cernis 52 located in a region of the Perseus molecular cloudcomplex with anomalous microwave emission. In addition to the presence of themost common diffuse interstellar bands DIBs we detect two new interstellar orcircumstellar bands coincident to within 0.01% in wavelength with the twostrongest bands of the naphthalene cation C$ {10}$H$ {8}^+$ as measured ingas-phase laboratory spectroscopy at low temperatures and find marginalevidence for the third strongest band.Assuming these features are caused by the naphthalene cation, from themeasured intensity and available oscillator strengths we find that 0.008 % ofthe carbon in the cloud could be in the form of this molecule. We expecthydrogen additions to cause hydronaphthalene cations to be abundant in thecloud and to contribute via electric dipole radiation to the anomalousmicrowave emission. The identification of new interstellar features consistentwith transitions of the simplest polycyclic aromatic hydrocarbon adds supportto the hypothesis that this type of molecules are the carriers of both diffuseinterstellar bands and anomalous microwave emission.



Author: S. Iglesias-Groth, A. Manchado, D. A. García-Hernández, J. I. González Hernández, D. L. Lambert

Source: https://arxiv.org/







Related documents