The Pulsar Contribution to the Gamma-Ray Background

Abstract

We estimate the contribution of Galactic pulsars, both ordinary and millisecond pulsars (MSPs), to the high-energy (>100 MeV) gamma-ray background. We pay particular attention to the high-latitude part of the background that could be confused with an extragalactic component in existing analyses that subtract a Galactic cosmic-ray model. Our pulsar population models are calibrated to the results of large-scale radio surveys and we employ a simple empirical gamma-ray luminosity calibration to the spin-down rate that provides a good fit to existing data. We find that while ordinary pulsars are expected to contribute only a fraction ~10^-3 of the high-latitude gamma-ray intensity (I_X~1x10^-5 ph s^-1 cm^-2 sr^-1), MSPs could provide a much larger contribution and even potentially overproduce it, depending on the model parameters. We explore these dependences using a range of MSP models as a guide to how gamma-ray measurements can usefully constrain the MSP population. Existing gamma-ray background measurements and source counts already rule out several models. Finally, we show how fluctuations in the gamma-ray sky can be used to distinguish between different sources of the background.

20 pages, including 3 figures, accepted by JCAP

References in corpus (22)

• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• A New Calculation of the Ionizing Background Spectrum and the Effects of HeII Reionization
• Fermi Large Area Telescope Bright Gamma-ray Source List
• Bright AGN Source List from the First Three Months of the Fermi Large Area Telescope All-Sky Survey
• A blueprint for detecting supersymmetric dark matter in the Galactic halo
• Evolution of the Intergalactic Opacity: Implications for the Ionizing Background, Cosmic Star Formation, and Quasar Activity
• The Dark Matter Annihilation Signal from Galactic Substructure: Predictions for GLAST
• Pre-launch estimates for GLAST sensitivity to Dark Matter annihilation signals
• High-Altitude Emission from Pulsar Slot Gaps: The Crab Pulsar
• Fermi LAT Observations of the Vela Pulsar
• Population synthesis of radio and gamma-ray millisecond pulsars from the Galactic disk
• A Flat Photoionization Rate at 2<z<4.2: Evidence for a Stellar-Dominated UV Background and Against a Decline of Cosmic Star Formation Beyond z~3
• Gamma ray astrophysics: the EGRET results
• A Survey of 56 Mid-latitude EGRET Error Boxes for Radio Pulsars
• Outer-gap vs. Slot-gap Models for Pulsar High Energy Emissions: The Case of the Crab Pulsar
• Can Astrophysical Gamma Ray Sources Mimic Dark Matter Annihilation in Galactic Satellites?
• Discovery of new gamma-ray pulsars with AGILE
• Source population synthesis and the Galactic diffuse gamma-ray emission
• Pulsed Gamma-rays from the millisecond pulsar J0030+0451 with the Fermi Large Area Telescope
• Discovery of High-Energy Gamma-Ray Pulsations from PSR J2021+3651 with AGILE
• The Spin Distribution of Millisecond X-ray Pulsars
• The Geminga Fraction

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• Bayesian Model Comparison and Analysis of the Galactic Disk Population of Gamma-Ray Millisecond Pulsars
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• A New Determination of the Millisecond Pulsar Gamma-Ray Luminosity Function and Implications for the Galactic Center Gamma-Ray Excess
• Constraints on ultracompact minihalos from the extragalactic gamma-ray background observation
• Extracting the unresolved pulsar contribution to the gamma-ray background
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• One blind and three targeted searches for (sub)millisecond pulsars
• Diffuse Pionic Gamma-Ray Emission from Large Scale Structures in the FERMI Era
• Population synthesis and parameter estimation of neutron stars with continuous gravitational waves and third-generation detectors
• Dark Matter implications of the Fermi-LAT measurement of anisotropies in the diffuse gamma-ray background: status report
• Prediction of radio-quiet gamma-ray pulsar distances using the Fundamental Plane relation
• Spherical harmonics analysis of Fermi gamma-ray data and the Galactic dark matter halo
• Anisotropies in the diffuse gamma-ray background measured by Fermi LAT
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