Spectrum of the Anomalous Microwave Emission in the North Celestial Pole with WMAP 7-Year Data
Joint Authors
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-12-19
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
We estimate the frequency spectrum of the diffuse anomalous microwave emission (AME) on the North Celestial Pole (NCP) region of the sky with the Correlated Component Analysis (CCA) component separation method applied to WMAP 7-yr data.
The NCP is a suitable region for this analysis because the AME is weakly contaminated by synchrotron and free-free emission.
By modeling the AME component as a peaked spectrum we estimate the peak frequency to be 21.7±0.8 GHz, in agreement with previous analyses which favored νp < 23 GHz.
The ability of our method to correctly recover the position of the peak is verified through simulations.
We compare the estimated AME spectrum with theoretical spinning dust models to constrain the hydrogen density nH.
The best results are obtained with densities around 0.2–0.3 cm−3, typical of warm ionised medium (WIM) to warm neutral medium (WNM) conditions.
The degeneracy with the gas temperature prevents an accurate determination of nH, especially for low hydrogen ionization fractions, where densities of a few cm−3 are also allowed.
American Psychological Association (APA)
Bonaldi, Anna& Ricciardi, Sara. 2012. Spectrum of the Anomalous Microwave Emission in the North Celestial Pole with WMAP 7-Year Data. Advances in Astronomy،Vol. 2012, no. 2012, pp.1-8.
https://search.emarefa.net/detail/BIM-503566
Modern Language Association (MLA)
Bonaldi, Anna& Ricciardi, Sara. Spectrum of the Anomalous Microwave Emission in the North Celestial Pole with WMAP 7-Year Data. Advances in Astronomy No. 2012 (2012), pp.1-8.
https://search.emarefa.net/detail/BIM-503566
American Medical Association (AMA)
Bonaldi, Anna& Ricciardi, Sara. Spectrum of the Anomalous Microwave Emission in the North Celestial Pole with WMAP 7-Year Data. Advances in Astronomy. 2012. Vol. 2012, no. 2012, pp.1-8.
https://search.emarefa.net/detail/BIM-503566
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-503566