124 citations · 320 across the 11 of their papers we have counts for
11 papers
Fermi-LAT Observations of Gamma-Ray Emission Towards the Outer Halo of M31
Chris Karwin, Simona Murgia, Sheldon Campbell +1
The Andromeda Galaxy is the closest spiral galaxy to us and has been the subject of numerous studies. It harbors a massive dark matter (DM) halo which may span up to ~600 kpc acros…
Fermi-LAT Observations of Gamma-Ray Emission Towards the Outer Halo of M31
Chris Karwin, Simona Murgia, Sheldon Campbell +1
The Andromeda Galaxy is the closest spiral galaxy to us and has been the subject of numerous studies. It harbors a massive dark matter (DM) halo which may span up to ~600 kpc acros…
The Galactic Isotropic -ray Background and Implications for Dark Matter
Sheldon S. Campbell, Anna Kwa, Manoj Kaplinghat
We present an analysis of the radial angular profile of the galacto-isotropic (GI) -ray flux--the statistically uniform flux in circular annuli about the Galactic center. Two di…
Angular Power Spectra with Finite Counts
Sheldon S. Campbell
Angular anisotropy techniques for cosmic diffuse radiation maps are powerful probes, even for quite small data sets. A popular observable is the angular power spectrum; we present…
Dark matter indirect detection signals and the nature of neutrinos in the supersymmetric extension of the standard model
Rouzbeh Allahverdi, Sheldon S. Campbell, Bhaskar Dutta +1
In this paper, we study the prospects for determining the nature of neutrinos in the context of a supersymmetric extension of the standard model by using dark matter indirect…
Combined Flux and Anisotropy Searches Improve Sensitivity to Gamma Rays from Dark Matter
Sheldon S. Campbell, John F. Beacom
Searches for dark matter annihilation signals in the diffuse gamma-ray background are promising. We present the first comprehensive study utilizing both flux and anisotropy, using…
Resolving Small-Scale Dark Matter Structures Using Multi-Source Indirect Detection
Kenny C. Y. Ng, Ranjan Laha, Sheldon Campbell +4
The extragalactic dark matter (DM) annihilation signal depends on the product of the clumping factor, <δ^2>, and the velocity-weighted annihilation cross section, σv. This "clumpin…
Extragalactic and galactic gamma-rays and neutrinos from annihilating dark matter
Rouzbeh Allahverdi, Sheldon Campbell, Bhaskar Dutta
We describe cosmic gamma-ray and neutrino signals of dark matter annihilation, explaining how the complementarity of these signals provides additional information that, if observab…
Effects of P-wave Annihilation on the Angular Power Spectrum of Extragalactic Gamma-rays from Dark Matter Annihilation
Sheldon Campbell, Bhaskar Dutta
We present a formalism for estimating the angular power spectrum of extragalactic gamma-rays produced by dark matter annihilating with any general velocity-dependent cross section.…
Effects of Velocity-Dependent Dark Matter Annihilation on the Energy Spectrum of the Extragalactic Gamma-ray Background
Sheldon Campbell, Bhaskar Dutta, Eiichiro Komatsu
We calculate the effects of velocity-dependent dark matter annihilation cross sections on the intensity of the extragalactic gamma-ray background. Our formalism does not assume a l…
Light Curves for Rapidly-Rotating Neutron Stars
Coire Cadeau, Sharon M. Morsink, Denis Leahy +1
We present raytracing computations for light emitted from the surface of a rapidly-rotating neutron star in order to construct light curves for X-ray pulsars and bursters. These ca…