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Advances in Astronomy
Volume 2013 (2013), Article ID 746020, 8 pages
http://dx.doi.org/10.1155/2013/746020
Research Article

A Characterization of the Diffuse Galactic Emissions in the Anticenter of the Galaxy

1Astrophysics Division, Research and Scientific Support Department, European Space Agency (ESA), Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
2LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, 53 Avenue des Martyrs, 38026 Grenoble Cedex, France
3California Institute of Technology, 1200 E. California Boualevard, Pasadena, CA 91125, USA
4Laboratoire d’Astrophysique de Grenoble, IPAG, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France

Received 8 July 2012; Revised 27 November 2012; Accepted 20 December 2012

Academic Editor: Angelica de Oliveira-Costa

Copyright © 2013 L. Fauvet et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Using the Archeops and WMAP data, we perform a study of the anticenter Galactic diffuse emissions—thermal dust, synchrotron, free-free, and anomalous emissions—at degree scales. The high-frequency data are used to infer the thermal dust electromagnetic spectrum and spatial distribution allowing us to precisely subtract this component at lower frequencies. After subtraction of the thermal dust component, a mixture of standard synchrotron and free-free emissions does not account for the residuals at these low frequencies. Including the all-sky 408 MHz Haslam data we find evidence for anomalous emission with a spectral index of −2.5 in units. However, we are not able to provide coclusion regarding the nature of this anomalous emission in this region. For this purpose, data between 408 MHz and 20 GHz covering the same sky region are needed.