Article

Tracing PAH Emission in lambda-Orionis Using COBE/DIRBE Data

Öffentlich Deposited
https://scholar.colorado.edu/concern/articles/3f4626854
Abstract
  • We use archival COBE/DIRBE data to construct a map of polycyclic aromatic hydrocarbon (PAH) emission in the λ-Orionis region. The presence of the 3.3 μm PAH feature within the DIRBE 3.5 μm band and the corresponding lack of significant PAH spectral features in the adjacent DIRBE bands (1.25, 2.2, and 4.9 μm) enable estimation of the PAH contribution to the 3.5 μm data. Having the shortest wavelength of known PAH features, the 3.3 μm feature probes the smallest PAHs, which are also the leading candidates for carriers of anomalous microwave emission (AME). We use this map to investigate the association between the AME and the emission from PAH molecules. We find that the spatial correlation in λ-Orionis is higher between AME and far-infrared dust emission (as represented by the DIRBE 240 μm map) than it is between our PAH map and AME. This finding, in agreement with previous studies using PAH features at longer wavelengths, is in tension with the hypothesis that AME is due to spinning PAHs. However, the expected correlation between mid-infrared and microwave emission could potentially be degraded by different sensitivities of each emission mechanism to local environmental conditions even if PAHs are the carriers of both.

     

Creator
Date Issued
  • 2022
Academic Affiliation
Journal Title
Journal Issue/Number
  • 1
Journal Volume
  • 940
Zuletzt geändert
  • 2023-08-01
Resource Type
Urheberrechts-Erklärung
License
DOI
ISSN
  • 1538-4357
Language

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