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Title: HAWC Observations Strongly Favor Pulsar Interpretations of the Cosmic-Ray Positron Excess

Abstract

Recent measurements of the Geminga and B0656+14 pulsars by the gamma-ray telescope HAWC (along with earlier measurements by Milagro) indicate that these objects generate significant fluxes of very high-energy electrons. In this paper, we use the very high-energy gamma-ray intensity and spectrum of these pulsars to calculate and constrain their expected contributions to the local cosmic-ray positron spectrum. Among models that are capable of reproducing the observed characteristics of the gamma-ray emission, we find that pulsars invariably produce a flux of high-energy positrons that is similar in spectrum and magnitude to the positron fraction measured by PAMELA and AMS-02. In light of this result, we conclude that it is very likely that pulsars provide the dominant contribution to the long perplexing cosmic-ray positron excess.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Fermilab
  2. Johns Hopkins U.
  3. Ohio State U., CCAPP
  4. Maryland U.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1350509
Report Number(s):
arXiv:1702.08436; FERMILAB-PUB-17-061-A
Journal ID: ISSN 2470-0010; 1515183
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Hooper, Dan, Cholis, Ilias, Linden, Tim, and Fang, Ke. HAWC Observations Strongly Favor Pulsar Interpretations of the Cosmic-Ray Positron Excess. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.96.103013.
Hooper, Dan, Cholis, Ilias, Linden, Tim, & Fang, Ke. HAWC Observations Strongly Favor Pulsar Interpretations of the Cosmic-Ray Positron Excess. United States. doi:10.1103/PhysRevD.96.103013.
Hooper, Dan, Cholis, Ilias, Linden, Tim, and Fang, Ke. Fri . "HAWC Observations Strongly Favor Pulsar Interpretations of the Cosmic-Ray Positron Excess". United States. doi:10.1103/PhysRevD.96.103013. https://www.osti.gov/servlets/purl/1350509.
@article{osti_1350509,
title = {HAWC Observations Strongly Favor Pulsar Interpretations of the Cosmic-Ray Positron Excess},
author = {Hooper, Dan and Cholis, Ilias and Linden, Tim and Fang, Ke},
abstractNote = {Recent measurements of the Geminga and B0656+14 pulsars by the gamma-ray telescope HAWC (along with earlier measurements by Milagro) indicate that these objects generate significant fluxes of very high-energy electrons. In this paper, we use the very high-energy gamma-ray intensity and spectrum of these pulsars to calculate and constrain their expected contributions to the local cosmic-ray positron spectrum. Among models that are capable of reproducing the observed characteristics of the gamma-ray emission, we find that pulsars invariably produce a flux of high-energy positrons that is similar in spectrum and magnitude to the positron fraction measured by PAMELA and AMS-02. In light of this result, we conclude that it is very likely that pulsars provide the dominant contribution to the long perplexing cosmic-ray positron excess.},
doi = {10.1103/PhysRevD.96.103013},
journal = {Physical Review D},
issn = {2470-0010},
number = ,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}

Works referenced in this record:

PAMELA Results on the Cosmic-Ray Antiproton Flux from 60 MeV to 180 GeV in Kinetic Energy
journal, September 2010


Measurements of the Cosmic-Ray Positron Fraction from 1 to 50 G[CLC]e[/CLC]V
journal, June 1997

  • Barwick, S. W.; Beatty, J. J.; Bhattacharyya, A.
  • The Astrophysical Journal, Vol. 482, Issue 2
  • DOI: 10.1086/310706

On possible interpretations of the high energy electron–positron spectrum measured by the Fermi Large Area Telescope
journal, September 2009


Pulsars as the sources of high energy cosmic ray positrons
journal, January 2009

  • Hooper, Dan; Blasi, Pasquale; Serpico, Pasquale Dario
  • Journal of Cosmology and Astroparticle Physics, Vol. 2009, Issue 01
  • DOI: 10.1088/1475-7516/2009/01/025

Origin of the Positron Excess in Cosmic Rays
journal, July 2009


Searches for Extended and Point-Like Neutrino Sources with four Years of Icecube data
journal, November 2014


TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess
journal, July 2009


A theory of dark matter
journal, January 2009

  • Arkani-Hamed, Nima; Finkbeiner, Douglas P.; Slatyer, Tracy R.
  • Physical Review D, Vol. 79, Issue 1
  • DOI: 10.1103/PhysRevD.79.015014

Search for VHE gamma-ray emission from Geminga pulsar and nebula with the MAGIC telescopes
journal, June 2016


Probing the Pulsar Origin of the Anomalous Positron Fraction with Ams-02 and Atmospheric Cherenkov Telescopes
journal, July 2013


Effective theory of Dirac dark matter
journal, May 2009


Testing Astrophysical Models for the PAMELA Positron Excess with Cosmic Ray Nuclei
journal, August 2009


FERMI -LAT OBSERVATIONS OF THE GEMINGA PULSAR
journal, August 2010


First year results of the High Altitude Water Cherenkov observatory
journal, October 2016


Dark matter and pulsar origins of the rising cosmic ray positron fraction in light of new data from the AMS
journal, July 2013


On Pulsar Distance Measurements and Their Uncertainties
journal, July 2012


Dissecting cosmic-ray electron-positron data with Occam’s razor: the role of known pulsars
journal, January 2012


The PAMELA positron excess from annihilations into a light boson
journal, December 2009

  • Cholis, Ilias; Finkbeiner, Douglas P.; Goodenough, Lisa
  • Journal of Cosmology and Astroparticle Physics, Vol. 2009, Issue 12
  • DOI: 10.1088/1475-7516/2009/12/007

Bremsstrahlung, Synchrotron Radiation, and Compton Scattering of High-Energy Electrons Traversing Dilute Gases
journal, April 1970


B / C ratio and the PAMELA positron excess
journal, February 2013


The 2HWC HAWC Observatory Gamma-Ray Catalog
journal, June 2017


Possible evidence for the stochastic acceleration of secondary antiprotons by supernova remnants
journal, June 2017


Leptophilic dark matter
journal, April 2009


Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
journal, March 2007


Measurement of Separate Cosmic-Ray Electron and Positron Spectra with the Fermi Large Area Telescope
journal, January 2012


The Evolution and Structure of Pulsar Wind Nebulae
journal, September 2006


Antimatter Production in Supernova Remnants
journal, May 2011


Model-independent implications of the , cosmic ray spectra on properties of Dark Matter
journal, May 2009


High energy positrons from annihilating dark matter
journal, December 2009


Cosmic ray acceleration in supernova remnants and the FERMI/PAMELA data
journal, December 2009


Dark matter annihilation rate with nonstandard thermal history
journal, October 2010

  • Nelson, Ann E.; Spitzer, Christopher
  • Journal of High Energy Physics, Vol. 2010, Issue 10
  • DOI: 10.1007/JHEP10(2010)066

MILAGRO OBSERVATIONS OF MULTI-TeV EMISSION FROM GALACTIC SOURCES IN THE FERMI BRIGHT SOURCE LIST
journal, July 2009


New positron spectral features from supersymmetric dark matter: A way to explain the PAMELA data?
journal, November 2008


FERMI -LAT SEARCH FOR PULSAR WIND NEBULAE AROUND GAMMA-RAY PULSARS
journal, December 2010


WIMPonium and boost factors for indirect dark matter detection
journal, June 2009


Charge asymmetric cosmic ray signals from dark matter decay
journal, July 2011


CONSTRAINTS ON THE GALACTIC POPULATION OF TeV PULSAR WIND NEBULAE USING FERMI LARGE AREA TELESCOPE OBSERVATIONS
journal, July 2013


Pulsars versus dark matter interpretation of ATIC/PAMELA
journal, September 2009


Astrophysical signatures of secluded dark matter
journal, January 2009


Case for a 700 + GeV WIMP: Cosmic ray spectra from PAMELA, Fermi, and ATIC
journal, December 2009


Constraining the origin of the rising cosmic ray positron fraction with the boron-to-carbon ratio
journal, February 2014