The Fermi Haze: A Gamma-Ray Counterpart to the Microwave Haze - Astrophysics > High Energy Astrophysical PhenomenaReportar como inadecuado




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Abstract: The Fermi Gamma-Ray Space Telescope reveals a diffuse inverse Compton signalin the inner Galaxy with a similar spatial morphology to the microwave hazeobserved by WMAP, supporting the synchrotron interpretation of the microwavesignal. Using spatial templates, we regress out pi0 gammas, as well as IC andbremsstrahlung components associated with known soft-synchrotron counterparts.We find a significant gamma-ray excess towards the Galactic center with aspectrum that is significantly harder than other sky components and is mostconsistent with IC from a hard population of electrons. The morphology andspectrum are consistent with it being the IC counterpart to the electrons whichgenerate the microwave haze seen at WMAP frequencies. In addition, the impliedelectron spectrum is hard; electrons accelerated in supernova shocks in thedisk which then diffuse a few kpc to the haze region would have a softerspectrum. We describe the full sky Fermi maps used in this analysis and makethem available for download.



Autor: Gregory Dobler KITP-UCSB, Harvard-CfA, Douglas P. Finkbeiner Harvard-CfA, Ilias Cholis NYU, Tracy R. Slatyer Harvard-CfA, Neal We

Fuente: https://arxiv.org/







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