Resolved observations at 31 GHz of spinning dust emissivity variations in ρ Oph
| Autor: | J. Anton Zensus, Miguel Cárcamo, Angela C. Taylor, Simon Casassus, M. Jones, M. Vidal, Anthony C. S. Readhead, J. Richard Bond, Brandon S. Hensley, Carla Arce-Tord, Ricardo Genova-Santos, Clive Dickinson |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
010308 nuclear & particles physics Spinning dust Astrophysics::High Energy Astrophysical Phenomena Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences 13. Climate action Space and Planetary Science 0103 physical sciences Emissivity Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 495:3482-3493 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/staa1422 |
| Popis: | The $\rho$ Oph molecular cloud is one of the best examples of spinning dust emission, first detected by the Cosmic Background Imager (CBI). Here we present 4.5 arcmin observations with CBI 2 that confirm 31 GHz emission from $\rho$ Oph W, the PDR exposed to B-type star HD 147889, and highlight the absence of signal from S1, the brightest IR nebula in the complex. In order to quantify an association with dust-related emission mechanisms, we calculated correlations at different angular resolutions between the 31 GHz map and proxies for the column density of IR emitters, dust radiance and optical depth templates. We found that the 31 GHz emission correlates best with the PAH column density tracers, while the correlation with the dust radiance improves when considering emission that is more extended (from the shorter baselines), suggesting that the angular resolution of the observations affects the correlation results. A proxy for the spinning dust emissivity reveals large variations within the complex, with a dynamic range of 25 at 3$\sigma$ and a variation by a factor of at least 23, at 3$\sigma$, between the peak in $\rho$ Oph W and the location of S1, which means that environmental factors are responsible for boosting spinning dust emissivities locally. Comment: 12 pages, 7 figures, 8 tables. Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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