Probing Particle Diffusion around Two Nearby Pulsars with TeV Gamma-Ray Observations from HAWC
Abstract
Nearby cosmic-ray accelerators, especially pulsar wind nebulae, are possible origins of the local multi-GeV positron excess. Pulsar Geminga and B0656+14, less than 300 pc from the Earth, have been postulated as the main sources of the positron excess. With one and half years of data, the HAWC gamma-ray observatory discovered very extended TeV gamma-ray structures produced from high-energy electrons and positrons around these two nearby middle-aged pulsars. Morphology studies suggest that the diffusion in the vicinity of these two pulsars is 100 times slower than the average in our Galaxy. This result provides important constraints on the origin of positron excess, but raises questions like why diffusion is so slow at high energies near these pulsars. With more than twice of data from the previous results, we now explore the possibility of energy-dependent diffusion at these sources.
- Authors:
-
[1];
[1]
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); HAWC Collaboration
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- Contributing Org.:
- HAWC Collaboration
- OSTI Identifier:
- 1783546
- Report Number(s):
- LA-UR-21-22674
Journal ID: ISSN 1824-8039
- Grant/Contract Number:
- 89233218CNA000001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- PoS - Proceedings of Science
- Additional Journal Information:
- Conference: 36th International Cosmic Ray Conference, Madison, WI (United States), 24 July - 01 Aug. 2019; Journal ID: ISSN 1824-8039
- Publisher:
- SISSA
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Astronomy and Astrophysics
Citation Formats
Harding, James Patrick, and Zhou, Hao. Probing Particle Diffusion around Two Nearby Pulsars with TeV Gamma-Ray Observations from HAWC. United States: N. p., 2019.
Web. doi:10.22323/1.358.0832.
Harding, James Patrick, & Zhou, Hao. Probing Particle Diffusion around Two Nearby Pulsars with TeV Gamma-Ray Observations from HAWC. United States. https://doi.org/10.22323/1.358.0832
Harding, James Patrick, and Zhou, Hao. Mon .
"Probing Particle Diffusion around Two Nearby Pulsars with TeV Gamma-Ray Observations from HAWC". United States. https://doi.org/10.22323/1.358.0832. https://www.osti.gov/servlets/purl/1783546.
@article{osti_1783546,
title = {Probing Particle Diffusion around Two Nearby Pulsars with TeV Gamma-Ray Observations from HAWC},
author = {Harding, James Patrick and Zhou, Hao},
abstractNote = {Nearby cosmic-ray accelerators, especially pulsar wind nebulae, are possible origins of the local multi-GeV positron excess. Pulsar Geminga and B0656+14, less than 300 pc from the Earth, have been postulated as the main sources of the positron excess. With one and half years of data, the HAWC gamma-ray observatory discovered very extended TeV gamma-ray structures produced from high-energy electrons and positrons around these two nearby middle-aged pulsars. Morphology studies suggest that the diffusion in the vicinity of these two pulsars is 100 times slower than the average in our Galaxy. This result provides important constraints on the origin of positron excess, but raises questions like why diffusion is so slow at high energies near these pulsars. With more than twice of data from the previous results, we now explore the possibility of energy-dependent diffusion at these sources.},
doi = {10.22323/1.358.0832},
journal = {PoS - Proceedings of Science},
number = ,
volume = ,
place = {United States},
year = {Mon Jul 22 00:00:00 EDT 2019},
month = {Mon Jul 22 00:00:00 EDT 2019}
}
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