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Planck intermediate results: XII. Diffuse galactic components in the Gould Belt system

Autor Bonaldi, A.; Barreiro, R. Belén ; Diego, José María ; González-Nuevo, J. ; Toffolatti, L. ; Vielva, P. ; Rebolo López, Rafael; Planck Collaboration
Palabras clave Galaxy: general
Radio continuum: ISM
Radiation mechanisms: general
Fecha de publicación 2013
EditorEDP Sciences
Citación Astronomy and Astrophysics 557: A53 (2013)
ResumenWe perform an analysis of the diffuse low-frequency Galactic components in the southern part of the Gould Belt system (130◦ ≤ l ≤ 230◦ and −50◦ ≤ b ≤ −10◦). Strong ultra-violet flux coming from the Gould Belt super-association is responsible for bright diffuse foregrounds that we observe from our position inside the system and that can help us improve our knowledge of the Galactic emission. Free-free emission and anomalous microwave emission (AME) are the dominant components at low frequencies (ν < 40 GHz), while synchrotron emission is very smooth and faint. We separated diffuse free-free emission and AME from synchrotron emission and thermal dust emission by using Planck data, complemented by ancillary data, using the correlated component analysis (CCA) component-separation method and we compared our results with the results of cross-correlation of foreground templates with the frequency maps. We estimated the electron temperature Te from Hα and free-free emission using two methods (temperature-temperature plot and cross-correlation) and obtained Te ranging from 3100 to 5200 K for an effective fraction of absorbing dust along the line of sight of 30% ( fd = 0.3). We estimated the frequency spectrum of the diffuse AME and recovered a peak frequency (in flux density units) of 25.5±1.5 GHz.We verified the reliability of this result with realistic simulations that include biases in the spectral model for the AME and in the free-free template. By combining physical models for vibrational and rotational dust emission and adding the constraints from the thermal dust spectrum from Planck and IRAS, we are able to present a good description of the AME frequency spectrum for plausible values of the local density and radiation field.
Versión del editorhttp://dx.doi.org/10.1051/0004-6361/201321160
URI http://hdl.handle.net/10261/109406
Identificadoresdoi: 10.1051/0004-6361/201321160
issn: 0004-6361
e-issn: 1432-0746
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