The Fermi haze

A Gamma-ray counterpart to the microwave haze

Gregory Dobler, Douglas P. Finkbeiner, Ilias Cholis, Tracy Slatyer, Neal Weiner

    Research output: Contribution to journalArticle

    Abstract

    The Fermi Gamma-ray Space Telescope reveals a diffuse inverse Compton (IC) 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 π0 gammas, as well as IC and bremsstrahlung components associated with known soft-synchrotron counterparts. We find a significant gamma-ray excess toward 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.

    Original languageEnglish (US)
    Pages (from-to)825-842
    Number of pages18
    JournalAstrophysical Journal
    Volume717
    Issue number2
    DOIs
    StatePublished - 2010

    Fingerprint

    haze
    gamma rays
    microwaves
    electron
    sky
    synchrotrons
    electrons
    Fermi Gamma-ray Space Telescope
    bremsstrahlung
    supernovae
    templates
    shock
    galaxies
    microwave

    Keywords

    • gamma rays: general
    • gamma rays: ISM

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Dobler, G., Finkbeiner, D. P., Cholis, I., Slatyer, T., & Weiner, N. (2010). The Fermi haze: A Gamma-ray counterpart to the microwave haze. Astrophysical Journal, 717(2), 825-842. https://doi.org/10.1088/0004-637X/717/2/825

    The Fermi haze : A Gamma-ray counterpart to the microwave haze. / Dobler, Gregory; Finkbeiner, Douglas P.; Cholis, Ilias; Slatyer, Tracy; Weiner, Neal.

    In: Astrophysical Journal, Vol. 717, No. 2, 2010, p. 825-842.

    Research output: Contribution to journalArticle

    Dobler, G, Finkbeiner, DP, Cholis, I, Slatyer, T & Weiner, N 2010, 'The Fermi haze: A Gamma-ray counterpart to the microwave haze', Astrophysical Journal, vol. 717, no. 2, pp. 825-842. https://doi.org/10.1088/0004-637X/717/2/825
    Dobler, Gregory ; Finkbeiner, Douglas P. ; Cholis, Ilias ; Slatyer, Tracy ; Weiner, Neal. / The Fermi haze : A Gamma-ray counterpart to the microwave haze. In: Astrophysical Journal. 2010 ; Vol. 717, No. 2. pp. 825-842.
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