Case for a 700+GeV WIMP

Cosmic ray spectra from PAMELA, Fermi, and ATIC

Ilias Cholis, Gregory Dobler, Douglas P. Finkbeiner, Lisa Goodenough, Neal Weiner

    Research output: Contribution to journalArticle

    Abstract

    Multiple lines of evidence indicate an anomalous injection of high-energy e+e- in the galactic halo. The recent e+ fraction spectrum from the payload for antimatter matter exploration and light-nuclei astrophysics (PAMELA) shows a sharp rise up to 100 GeV. The Fermi gamma-ray space telescope has found a significant hardening of the e+e- cosmic-ray spectrum above 100 GeV, with a break, confirmed by HESS at around 1 TeV. The advanced thin ionization calorimeter (ATIC) has also detected a similar excess, falling back to the expected spectrum at 1 TeV and above. Excess microwaves towards the galactic center in the WMAP data are consistent with hard synchrotron radiation from a population of 10-100 GeV e+e- (the WMAP "Haze"). We argue that dark matter annihilations can provide a consistent explanation of all of these data, focusing on dominantly leptonic modes, either directly or through a new light boson. Normalizing the signal to the highest energy evidence (Fermi and HESS), we find that similar cross sections provide good fits to PAMELA and the Haze, and that both the required cross section and annihilation modes are achievable in models with Sommerfeld-enhanced annihilation. These models naturally predict significant production of gamma rays in the galactic center via a variety of mechanisms. Most notably, there is a robust inverse-Compton scattered (ICS) gamma-ray signal arising from the energetic electrons and positrons, detectable at Fermi/GLAST energies, which should provide smoking gun evidence for this production.

    Original languageEnglish (US)
    Article number123518
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume80
    Issue number12
    DOIs
    StatePublished - Dec 15 2009

    Fingerprint

    antimatter
    weakly interacting massive particles
    payloads
    calorimeters
    cosmic rays
    Fermi Gamma-ray Space Telescope
    astrophysics
    haze
    ionization
    nuclei
    gamma rays
    normalizing
    galactic halos
    cross sections
    falling
    hardening
    energy
    positrons
    dark matter
    synchrotron radiation

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Case for a 700+GeV WIMP : Cosmic ray spectra from PAMELA, Fermi, and ATIC. / Cholis, Ilias; Dobler, Gregory; Finkbeiner, Douglas P.; Goodenough, Lisa; Weiner, Neal.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 80, No. 12, 123518, 15.12.2009.

    Research output: Contribution to journalArticle

    Cholis, Ilias ; Dobler, Gregory ; Finkbeiner, Douglas P. ; Goodenough, Lisa ; Weiner, Neal. / Case for a 700+GeV WIMP : Cosmic ray spectra from PAMELA, Fermi, and ATIC. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2009 ; Vol. 80, No. 12.
    @article{c67c87ae6b7c4e5781962f902d488acd,
    title = "Case for a 700+GeV WIMP: Cosmic ray spectra from PAMELA, Fermi, and ATIC",
    abstract = "Multiple lines of evidence indicate an anomalous injection of high-energy e+e- in the galactic halo. The recent e+ fraction spectrum from the payload for antimatter matter exploration and light-nuclei astrophysics (PAMELA) shows a sharp rise up to 100 GeV. The Fermi gamma-ray space telescope has found a significant hardening of the e+e- cosmic-ray spectrum above 100 GeV, with a break, confirmed by HESS at around 1 TeV. The advanced thin ionization calorimeter (ATIC) has also detected a similar excess, falling back to the expected spectrum at 1 TeV and above. Excess microwaves towards the galactic center in the WMAP data are consistent with hard synchrotron radiation from a population of 10-100 GeV e+e- (the WMAP {"}Haze{"}). We argue that dark matter annihilations can provide a consistent explanation of all of these data, focusing on dominantly leptonic modes, either directly or through a new light boson. Normalizing the signal to the highest energy evidence (Fermi and HESS), we find that similar cross sections provide good fits to PAMELA and the Haze, and that both the required cross section and annihilation modes are achievable in models with Sommerfeld-enhanced annihilation. These models naturally predict significant production of gamma rays in the galactic center via a variety of mechanisms. Most notably, there is a robust inverse-Compton scattered (ICS) gamma-ray signal arising from the energetic electrons and positrons, detectable at Fermi/GLAST energies, which should provide smoking gun evidence for this production.",
    author = "Ilias Cholis and Gregory Dobler and Finkbeiner, {Douglas P.} and Lisa Goodenough and Neal Weiner",
    year = "2009",
    month = "12",
    day = "15",
    doi = "10.1103/PhysRevD.80.123518",
    language = "English (US)",
    volume = "80",
    journal = "Physical review D: Particles and fields",
    issn = "1550-7998",
    publisher = "American Physical Society",
    number = "12",

    }

    TY - JOUR

    T1 - Case for a 700+GeV WIMP

    T2 - Cosmic ray spectra from PAMELA, Fermi, and ATIC

    AU - Cholis, Ilias

    AU - Dobler, Gregory

    AU - Finkbeiner, Douglas P.

    AU - Goodenough, Lisa

    AU - Weiner, Neal

    PY - 2009/12/15

    Y1 - 2009/12/15

    N2 - Multiple lines of evidence indicate an anomalous injection of high-energy e+e- in the galactic halo. The recent e+ fraction spectrum from the payload for antimatter matter exploration and light-nuclei astrophysics (PAMELA) shows a sharp rise up to 100 GeV. The Fermi gamma-ray space telescope has found a significant hardening of the e+e- cosmic-ray spectrum above 100 GeV, with a break, confirmed by HESS at around 1 TeV. The advanced thin ionization calorimeter (ATIC) has also detected a similar excess, falling back to the expected spectrum at 1 TeV and above. Excess microwaves towards the galactic center in the WMAP data are consistent with hard synchrotron radiation from a population of 10-100 GeV e+e- (the WMAP "Haze"). We argue that dark matter annihilations can provide a consistent explanation of all of these data, focusing on dominantly leptonic modes, either directly or through a new light boson. Normalizing the signal to the highest energy evidence (Fermi and HESS), we find that similar cross sections provide good fits to PAMELA and the Haze, and that both the required cross section and annihilation modes are achievable in models with Sommerfeld-enhanced annihilation. These models naturally predict significant production of gamma rays in the galactic center via a variety of mechanisms. Most notably, there is a robust inverse-Compton scattered (ICS) gamma-ray signal arising from the energetic electrons and positrons, detectable at Fermi/GLAST energies, which should provide smoking gun evidence for this production.

    AB - Multiple lines of evidence indicate an anomalous injection of high-energy e+e- in the galactic halo. The recent e+ fraction spectrum from the payload for antimatter matter exploration and light-nuclei astrophysics (PAMELA) shows a sharp rise up to 100 GeV. The Fermi gamma-ray space telescope has found a significant hardening of the e+e- cosmic-ray spectrum above 100 GeV, with a break, confirmed by HESS at around 1 TeV. The advanced thin ionization calorimeter (ATIC) has also detected a similar excess, falling back to the expected spectrum at 1 TeV and above. Excess microwaves towards the galactic center in the WMAP data are consistent with hard synchrotron radiation from a population of 10-100 GeV e+e- (the WMAP "Haze"). We argue that dark matter annihilations can provide a consistent explanation of all of these data, focusing on dominantly leptonic modes, either directly or through a new light boson. Normalizing the signal to the highest energy evidence (Fermi and HESS), we find that similar cross sections provide good fits to PAMELA and the Haze, and that both the required cross section and annihilation modes are achievable in models with Sommerfeld-enhanced annihilation. These models naturally predict significant production of gamma rays in the galactic center via a variety of mechanisms. Most notably, there is a robust inverse-Compton scattered (ICS) gamma-ray signal arising from the energetic electrons and positrons, detectable at Fermi/GLAST energies, which should provide smoking gun evidence for this production.

    UR - http://www.scopus.com/inward/record.url?scp=73449103161&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=73449103161&partnerID=8YFLogxK

    U2 - 10.1103/PhysRevD.80.123518

    DO - 10.1103/PhysRevD.80.123518

    M3 - Article

    VL - 80

    JO - Physical review D: Particles and fields

    JF - Physical review D: Particles and fields

    SN - 1550-7998

    IS - 12

    M1 - 123518

    ER -