Microwave observations of spinning dust emission in NGC 6946
We report new cm-wave measurements at five frequencies between 15 and 18 GHz of thecontinuum emission from the reportedly anomalous ‘region 4’ of the nearby galaxyNGC6946.We find that the emission in this frequency range is significantly in excess of that measuredat 8.5 GHz, but has a spectrum from...
| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Published: |
Wiley-Blackwell Publishing Ltd.
2010
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| Subjects: | |
| Online Access: | http://mnrasl.oxfordjournals.org/content/406/1/L45.full.pdf http://hdl.handle.net/20.500.11937/16893 |
| _version_ | 1848749306955169792 |
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| author | Scaife, A. Nikolic, B. Green, D. Beck, R. Davies, M. Franzen, Thomas Grainge, K. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Olamaie, M. Pooley, G. Rodriguez-Gonzalvez, C. Saunders, R. Scott, P. Shimwell, T. Titterington, D. Waldram, E. Zwart, J. |
| author_facet | Scaife, A. Nikolic, B. Green, D. Beck, R. Davies, M. Franzen, Thomas Grainge, K. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Olamaie, M. Pooley, G. Rodriguez-Gonzalvez, C. Saunders, R. Scott, P. Shimwell, T. Titterington, D. Waldram, E. Zwart, J. |
| author_sort | Scaife, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We report new cm-wave measurements at five frequencies between 15 and 18 GHz of thecontinuum emission from the reportedly anomalous ‘region 4’ of the nearby galaxyNGC6946.We find that the emission in this frequency range is significantly in excess of that measuredat 8.5 GHz, but has a spectrum from 15 to 18 GHz consistent with optically thin free–freeemission from an ultracompact HII region. In combination with previously published data,we fit four emission models containing different continuum components using the Bayesianspectrum analysis package RADIOSPEC. These fits show that, in combination with data at otherfrequencies, a model with a spinning dust component is slightly preferred to those that possessbetter-established emission mechanisms. |
| first_indexed | 2025-11-14T07:18:51Z |
| format | Journal Article |
| id | curtin-20.500.11937-16893 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:18:51Z |
| publishDate | 2010 |
| publisher | Wiley-Blackwell Publishing Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-168932017-05-30T08:10:08Z Microwave observations of spinning dust emission in NGC 6946 Scaife, A. Nikolic, B. Green, D. Beck, R. Davies, M. Franzen, Thomas Grainge, K. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Olamaie, M. Pooley, G. Rodriguez-Gonzalvez, C. Saunders, R. Scott, P. Shimwell, T. Titterington, D. Waldram, E. Zwart, J. galaxies: individual: NGC6946 radiation mechanisms: general We report new cm-wave measurements at five frequencies between 15 and 18 GHz of thecontinuum emission from the reportedly anomalous ‘region 4’ of the nearby galaxyNGC6946.We find that the emission in this frequency range is significantly in excess of that measuredat 8.5 GHz, but has a spectrum from 15 to 18 GHz consistent with optically thin free–freeemission from an ultracompact HII region. In combination with previously published data,we fit four emission models containing different continuum components using the Bayesianspectrum analysis package RADIOSPEC. These fits show that, in combination with data at otherfrequencies, a model with a spinning dust component is slightly preferred to those that possessbetter-established emission mechanisms. 2010 Journal Article http://hdl.handle.net/20.500.11937/16893 http://mnrasl.oxfordjournals.org/content/406/1/L45.full.pdf Wiley-Blackwell Publishing Ltd. restricted |
| spellingShingle | galaxies: individual: NGC6946 radiation mechanisms: general Scaife, A. Nikolic, B. Green, D. Beck, R. Davies, M. Franzen, Thomas Grainge, K. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Olamaie, M. Pooley, G. Rodriguez-Gonzalvez, C. Saunders, R. Scott, P. Shimwell, T. Titterington, D. Waldram, E. Zwart, J. Microwave observations of spinning dust emission in NGC 6946 |
| title | Microwave observations of spinning dust emission in NGC 6946 |
| title_full | Microwave observations of spinning dust emission in NGC 6946 |
| title_fullStr | Microwave observations of spinning dust emission in NGC 6946 |
| title_full_unstemmed | Microwave observations of spinning dust emission in NGC 6946 |
| title_short | Microwave observations of spinning dust emission in NGC 6946 |
| title_sort | microwave observations of spinning dust emission in ngc 6946 |
| topic | galaxies: individual: NGC6946 radiation mechanisms: general |
| url | http://mnrasl.oxfordjournals.org/content/406/1/L45.full.pdf http://hdl.handle.net/20.500.11937/16893 |