On the Limitations of the Anomalous Microwave Emission Emissivity
Many studies of anomalous microwave emission (AME) have computed an AME emissivity to compare the strength of the AME detected in different regions. Such a value is usually defined as the ratio between the intensity of the AME at 1 cm and the thermal dust emission at 100 μm. However, as studies of G...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2012-01-01
|
| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2012/124931 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841524850059902976 |
|---|---|
| author | Christopher T. Tibbs Roberta Paladini Clive Dickinson |
| author_facet | Christopher T. Tibbs Roberta Paladini Clive Dickinson |
| author_sort | Christopher T. Tibbs |
| collection | DOAJ |
| description | Many studies of anomalous microwave emission (AME) have computed an AME emissivity to compare the strength of the AME detected in different regions. Such a value is usually defined as the ratio between the intensity of the AME at 1 cm and the thermal dust emission at 100 μm. However, as studies of Galactic dust emission have shown, the intensity of the thermal dust emission at 100 μm is strongly dependent on the dust temperature, which has severe implications for the AME emissivity defined in this way. In this work, we illustrate and quantify this effect and find that the AME emissivity decreases by a factor of 11.1 between dust temperatures of 20 and 30 K. We, therefore, conclude that computing the AME emissivity relative to the 100 μm emission does not allow for accurate comparisons between the AME observed in different environments. With this in mind, we investigate the use of other tracers of the dust emission with which to compute the AME emissivity and we ultimately conclude that, despite the difficulty in deriving its value, the column density of the dust would be the most suitable quantity with which to compute the AME emissivity. |
| format | Article |
| id | doaj-art-47c10f1c4faf42d48c045cb1dda77868 |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-47c10f1c4faf42d48c045cb1dda778682025-02-03T05:47:10ZengWileyAdvances in Astronomy1687-79691687-79772012-01-01201210.1155/2012/124931124931On the Limitations of the Anomalous Microwave Emission EmissivityChristopher T. Tibbs0Roberta Paladini1Clive Dickinson2Spitzer Science Center, Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USANASA Herschel Science Center, Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USAJodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UKMany studies of anomalous microwave emission (AME) have computed an AME emissivity to compare the strength of the AME detected in different regions. Such a value is usually defined as the ratio between the intensity of the AME at 1 cm and the thermal dust emission at 100 μm. However, as studies of Galactic dust emission have shown, the intensity of the thermal dust emission at 100 μm is strongly dependent on the dust temperature, which has severe implications for the AME emissivity defined in this way. In this work, we illustrate and quantify this effect and find that the AME emissivity decreases by a factor of 11.1 between dust temperatures of 20 and 30 K. We, therefore, conclude that computing the AME emissivity relative to the 100 μm emission does not allow for accurate comparisons between the AME observed in different environments. With this in mind, we investigate the use of other tracers of the dust emission with which to compute the AME emissivity and we ultimately conclude that, despite the difficulty in deriving its value, the column density of the dust would be the most suitable quantity with which to compute the AME emissivity.http://dx.doi.org/10.1155/2012/124931 |
| spellingShingle | Christopher T. Tibbs Roberta Paladini Clive Dickinson On the Limitations of the Anomalous Microwave Emission Emissivity Advances in Astronomy |
| title | On the Limitations of the Anomalous Microwave Emission Emissivity |
| title_full | On the Limitations of the Anomalous Microwave Emission Emissivity |
| title_fullStr | On the Limitations of the Anomalous Microwave Emission Emissivity |
| title_full_unstemmed | On the Limitations of the Anomalous Microwave Emission Emissivity |
| title_short | On the Limitations of the Anomalous Microwave Emission Emissivity |
| title_sort | on the limitations of the anomalous microwave emission emissivity |
| url | http://dx.doi.org/10.1155/2012/124931 |
| work_keys_str_mv | AT christopherttibbs onthelimitationsoftheanomalousmicrowaveemissionemissivity AT robertapaladini onthelimitationsoftheanomalousmicrowaveemissionemissivity AT clivedickinson onthelimitationsoftheanomalousmicrowaveemissionemissivity |