Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-10-26
Astrophys.J.717:825-842,2010
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
21 pages, 18 figures; accepted in ApJ; several new fits including the Fermi Diffuse Model and expanded discussion of fit resid
Scientific paper
10.1088/0004-637X/717/2/825
The Fermi Gamma-Ray Space Telescope reveals a diffuse inverse Compton signal in the inner Galaxy with a similar spatial morphology to the microwave haze observed by WMAP, supporting the synchrotron interpretation of the microwave signal. Using spatial templates, we regress out pi0 gammas, as well as IC and bremsstrahlung components associated with known soft-synchrotron counterparts. We find a significant gamma-ray excess towards the Galactic center with a spectrum that is significantly harder than other sky components and is most consistent with IC from a hard population of electrons. The morphology and spectrum are consistent with it being the IC counterpart to the electrons which generate the microwave haze seen at WMAP frequencies. In addition, the implied electron spectrum is hard; electrons accelerated in supernova shocks in the disk which then diffuse a few kpc to the haze region would have a softer spectrum. We describe the full sky Fermi maps used in this analysis and make them available for download.
Cholis Ilias
Dobler Gregory
Finkbeiner Douglas Paul
Slatyer Tracy R.
Weiner Neal
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