Observations of Anomalous Microwave Emission from HII Regions
I give a summary of the observations of Anomalous Microwave Emission (AME) from HII regions. AME has been detected in, or in the vicinity of, HII regions. Given the difficulties in measuring accurate SEDs over a wide range of frequencies and in complex environments, many of these detections require...
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Wiley
2013-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2013/162478 |
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| author | Clive Dickinson |
| author_facet | Clive Dickinson |
| author_sort | Clive Dickinson |
| collection | DOAJ |
| description | I give a summary of the observations of Anomalous Microwave Emission (AME) from HII regions. AME has been detected in, or in the vicinity of, HII regions. Given the difficulties in measuring accurate SEDs over a wide range of frequencies and in complex environments, many of these detections require more data to confirm them as emitting significant AME. The contribution from optically thick
free-free emission from UCHII regions may be also be significant in some cases. The AME emissivity, defined as the ratio of the AME brightness to the 100 μm brightness, is comparable to the value observed in high-latitude diffuse cirrus in some regions, but is significantly lower in others. However, this value is dependent on the dust temperature. More data, both at high frequencies (>~5 GHz) and high resolution (~1′ or better) is required to disentangle the emission processes in such complex regions. |
| format | Article |
| id | doaj-art-847e9515268544fb9edb2c6679e3d2d4 |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-847e9515268544fb9edb2c6679e3d2d42025-02-03T01:11:59ZengWileyAdvances in Astronomy1687-79691687-79772013-01-01201310.1155/2013/162478162478Observations of Anomalous Microwave Emission from HII RegionsClive Dickinson0Jodrell Bank Centre for Astrophysics, School of Physics & Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UKI give a summary of the observations of Anomalous Microwave Emission (AME) from HII regions. AME has been detected in, or in the vicinity of, HII regions. Given the difficulties in measuring accurate SEDs over a wide range of frequencies and in complex environments, many of these detections require more data to confirm them as emitting significant AME. The contribution from optically thick free-free emission from UCHII regions may be also be significant in some cases. The AME emissivity, defined as the ratio of the AME brightness to the 100 μm brightness, is comparable to the value observed in high-latitude diffuse cirrus in some regions, but is significantly lower in others. However, this value is dependent on the dust temperature. More data, both at high frequencies (>~5 GHz) and high resolution (~1′ or better) is required to disentangle the emission processes in such complex regions.http://dx.doi.org/10.1155/2013/162478 |
| spellingShingle | Clive Dickinson Observations of Anomalous Microwave Emission from HII Regions Advances in Astronomy |
| title | Observations of Anomalous Microwave Emission from HII Regions |
| title_full | Observations of Anomalous Microwave Emission from HII Regions |
| title_fullStr | Observations of Anomalous Microwave Emission from HII Regions |
| title_full_unstemmed | Observations of Anomalous Microwave Emission from HII Regions |
| title_short | Observations of Anomalous Microwave Emission from HII Regions |
| title_sort | observations of anomalous microwave emission from hii regions |
| url | http://dx.doi.org/10.1155/2013/162478 |
| work_keys_str_mv | AT clivedickinson observationsofanomalousmicrowaveemissionfromhiiregions |