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The Fermi Haze: A Gamma-Ray Counterpart to the Microwave Haze

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arxiv 0910.4583 v2 pith:5UCLT6UH submitted 2009-10-26 astro-ph.HE

The Fermi Haze: A Gamma-Ray Counterpart to the Microwave Haze

Gregory Dobler (KITP/UCSB , Harvard/CfA) , Douglas P. Finkbeiner (Harvard/CfA) , Ilias Cholis (NYU) , Tracy R. Slatyer (Harvard/CfA) , Neal Weiner (NYU) This is my paper
classification astro-ph.HE
keywords hazemicrowavespectrumelectronsfermigamma-raycomponentsconsistent
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 2 Pith papers

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  1. Nested Fermi and eROSITA bubbles require very similar $\sim10^{56}$ erg collimated Galactic-center outbursts; their asymmetry indicates an eastern density gradient

    astro-ph.HE 2026-01 unverdicted novelty 5.0

    The Fermi and eROSITA bubbles likely result from identical ~10^56 erg collimated outbursts separated by ~10 Myr, with asymmetry indicating an eastern ambient density gradient.

  2. Detection of polarized Fermi-bubble synchrotron and dust emission

    astro-ph.HE 2024-01 unverdicted novelty 5.0

    Reports ~20% projected polarization in synchrotron and thermal dust emission from Fermi bubbles, with fields parallel to edges, and attributes larger lobes to an older supermassive black hole outburst.