Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-24
Astrophys.J.614:186-193,2004
Astronomy and Astrophysics
Astrophysics
ApJ in press (accepted 5 Dec 2003), version 2: corrected typos and added references. 23 pages, 5 figures, 2 tables. Free-free
Scientific paper
10.1086/423482
We investigate the nature of the diffuse Galactic emission in the Wilkinson Microwave Anisotropy Probe (WMAP) temperature anisotropy data. Substantial dust-correlated emission is observed at all WMAP frequencies, far exceeding the expected thermal dust emission in the lowest frequency channels (23, 33, 41 GHz). The WMAP team (Bennett et al.) interpret this emission as dust-correlated synchrotron radiation, attributing the correlation to the natural association of relativistic electrons produced by SNae with massive star formation in dusty clouds, and deriving an upper limit of 5% on the contribution of Draine & Lazarian spinning dust at K-band (23 GHz). We pursue an alternative interpretation that much, perhaps most, of the dust-correlated emission at these frequencies is indeed spinning dust, and explore the spectral dependence on environment by considering a few specific objects as well as the full sky average. Models similar to Draine & Lazarian spinning dust provide a good fit to the full-sky data. The full-sky fit also requires a significant component with free-free spectrum uncorrelated with \Halpha, possibly hot (~million K) gas within 30 degrees of the Galactic center.
No associations
LandOfFree
Microwave ISM Emission Observed by WMAP does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Microwave ISM Emission Observed by WMAP, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microwave ISM Emission Observed by WMAP will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-670047