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Title: TeV gamma rays from Galactic Center pulsars

Abstract

Measurements of the nearby pulsars Geminga and B0656+14 by the HAWC and Milagro telescopes have revealed the presence of bright TeV-emitting halos surrounding these objects. If young and middle-aged pulsars near the Galactic Center transfer a similar fraction of their energy into TeV photons, then these sources could plausibly dominate the emission that is observed by HESS and other ground-based telescopes from the innermost $$\sim$$10^2$ parsecs of the Milky Way. In particular, both the spectral shape and the angular extent of this emission is consistent with TeV halos produced by a population of pulsars, although the reported correlation of this emission with the distribution of molecular gas suggests that diffuse hadronic processes also must contribute. The overall flux of this emission requires a birth rate of ~100-1000 neutron stars per Myr near the Galactic Center, in good agreement with recent estimates.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Fermilab Center for Particle Astrophysics; Univ. of Chicago, IL (United States). Dept. of Astronomy and Astrophysics, and Kavli Institute for Cosmological Physics
  2. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Physics and Astronomy
  3. The Ohio State Univ., Columbus, OH (United States). Center for Cosmology and AstroParticle Physics (CCAPP)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1367901
Alternate Identifier(s):
OSTI ID: 1567978
Report Number(s):
FERMILAB-PUB-17-173-A; arXiv:1705.09293
Journal ID: ISSN 2212-6864; 1601359
Grant/Contract Number:  
AC02-07CH11359; FG02-13ER41958; NNX15AB18G; PHY-1404311; SC0009924
Resource Type:
Accepted Manuscript
Journal Name:
Physics of the Dark Universe
Additional Journal Information:
Journal Volume: 21; Journal Issue: C; Journal ID: ISSN 2212-6864
Publisher:
Elsevier
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, and Linden, Tim. TeV gamma rays from Galactic Center pulsars. United States: N. p., 2018. Web. https://doi.org/10.1016/j.dark.2018.05.004.
Hooper, Dan, Cholis, Ilias, & Linden, Tim. TeV gamma rays from Galactic Center pulsars. United States. https://doi.org/10.1016/j.dark.2018.05.004
Hooper, Dan, Cholis, Ilias, and Linden, Tim. Mon . "TeV gamma rays from Galactic Center pulsars". United States. https://doi.org/10.1016/j.dark.2018.05.004. https://www.osti.gov/servlets/purl/1367901.
@article{osti_1367901,
title = {TeV gamma rays from Galactic Center pulsars},
author = {Hooper, Dan and Cholis, Ilias and Linden, Tim},
abstractNote = {Measurements of the nearby pulsars Geminga and B0656+14 by the HAWC and Milagro telescopes have revealed the presence of bright TeV-emitting halos surrounding these objects. If young and middle-aged pulsars near the Galactic Center transfer a similar fraction of their energy into TeV photons, then these sources could plausibly dominate the emission that is observed by HESS and other ground-based telescopes from the innermost $\sim$$10^2$ parsecs of the Milky Way. In particular, both the spectral shape and the angular extent of this emission is consistent with TeV halos produced by a population of pulsars, although the reported correlation of this emission with the distribution of molecular gas suggests that diffuse hadronic processes also must contribute. The overall flux of this emission requires a birth rate of ~100-1000 neutron stars per Myr near the Galactic Center, in good agreement with recent estimates.},
doi = {10.1016/j.dark.2018.05.004},
journal = {Physics of the Dark Universe},
number = C,
volume = 21,
place = {United States},
year = {2018},
month = {6}
}

Journal Article:

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Cited by: 7 works
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Figures / Tables:

Figure 1 Figure 1: The gamma-ray spectrum from the inverse-Compton scattering of very high-energy electrons and positrons in the region surrounding the Galactic Center. In the left frame, we show the spectrum of the central point source as reported by the HESS Collaboration, which is compared to that predicted in an environmentmore » with energy densities of radiation and magnetic fields that are 1000 times higher than in the local interstellar medium. In the right frame, we show the spectrum reported by HESS from within a 0.2° to 0.5° (partial) annulus around the Galactic Center, compared to that predicted with radiation and magnetic field energy densities that are ten times higher than in the local environment. We have parameterized the injected electron spectrum using the form dNe/dEe ∝ E$−α\atop{e}$ exp(−Ee/Ec), and show results in each frame for parameter values chosen to match the observed spectrum from Geminga (α = 1.9, Ec = 49 TeV), and for values chosen to provide the best-fit to the combination of the point-source and diffuse gamma-ray observations shown (α = 2.2, Ec = 100 TeV).« less

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Works referencing / citing this record:

Inverse Compton emission from millisecond pulsars in the Galactic bulge
journal, June 2019


    Figures / Tables found in this record:

      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.