Journal
ASTRONOMY & ASTROPHYSICS
Volume 557, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201321160
Keywords
Galaxy: general; radio continuum: ISM; radiation mechanisms: general
Categories
Funding
- ESA Member States
- NASA
- ESA
- CNES
- CNRS/INSU-IN2P3-INP (France)
- ASI
- CNR
- INAF (Italy)
- DoE (USA)
- STFC
- UKSA (UK)
- CSIC
- MICINN
- JA
- RES (Spain)
- Tekes
- AoF
- CSC (Finland)
- DLR
- MPG (Germany)
- CSA (Canada)
- DTU Space (Denmark)
- SER/SSO (Switzerland)
- RCN (Norway)
- SFI (Ireland)
- FCT/MCTES (Portugal)
- Science and Technology Facilities Council [ST/K002821/1, ST/L001314/1, ST/J00152X/1, ST/G001901/1, ST/J001368/1, ST/J001562/1, ST/K001051/1, ST/F010885/1, ST/K004131/1, ST/I005765/1] Funding Source: researchfish
- UK Space Agency [ST/H001212/1, ST/J004812/1, ST/K003674/1, ST/H001239/1, ST/G003874/1] Funding Source: researchfish
Ask authors/readers for more resources
We perform an analysis of the diffuse low-frequency Galactic components in the southern part of the Gould Belt system (130 degrees <= l <= 230 degrees and -50 degrees <= b <= -10 degrees). 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 (nu < 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 T-e from Ha and free-free emission using two methods (temperature-temperature plot and cross-correlation) and obtained T-e ranging from 3100 to 5200 K for an effective fraction of absorbing dust along the line of sight of 30% (f(d) = 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available