On the Limitations of the Anomalous Microwave Emission Emissivity

Дата и время публикации : 2012-12-13T19:01:55Z

Авторы публикации и институты :
C. T. Tibbs
R. Paladini
C. Dickinson

Ссылка на журнал-издание: Advances in Astronomy, vol. 2012, Article ID 124931, 2012
Коментарии к cтатье: Accepted for publication in the Advances in Astronomy Special Issue: Anomalous Microwave Emission: Theory, Modeling, and Observations. Published version available at http://www.hindawi.com/journals/aa/2012/124931/
Первичная категория: astro-ph.GA

Все категории : astro-ph.GA

Краткий обзор статьи: 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 mu m. However, as studies of Galactic dust emission have shown, the intensity of the thermal dust emission at 100 mu m 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 mu m 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.

Category: Physics