Tentative Detection of Electric Dipole Emission from Rapidly Rotating Dust Grains | Zendy

Douglas P. Finkbeiner | Zendy; David J. Schlegel | Zendy; Curtis Frank | Zendy; Carl Heiles | Zendy

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Tentative Detection of Electric Dipole Emission from Rapidly Rotating Dust Grains

Author(s) -

Douglas P. Finkbeiner,

David J. Schlegel,

Curtis Frank,

Carl Heiles

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/338225

Subject(s) - bremsstrahlung , physics , astrophysics , spinning , spectral line , emission spectrum , thermal emission , thermal , astronomy , optics , photon , materials science , meteorology , composite material

We present the first tentative detection of spinning dust emission fromspecific astronomical sources. All other detections in the current literatureare statistical. The Green Bank 140 foot telescope was used to observe 10 dustclouds at 5, 8, and 10 GHz. In some cases, the observed emission was consistentwith the negative spectral slope expected for free-free emission (thermalbremsstrahlung), but in two cases it was not. One HII region yields a risingspectrum, inconsistent with free-free or synchrotron emission at the 10 sigmalevel. One dark cloud (L 1622) has a similar spectrum with lower significance.Both spectra are consistent with electric dipole emission from rapidly rotatingdust grains ("spinning dust"), as predicted by Draine & Lazarian.Comment: 18 pages, 5 figures, accepted by Ap

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