Follow-up Analysis to Geminga's contribution to the Local Positron Excess with HAWC Gamma-Ray Observatory

Escobedo, Ramiro Torres; Zhou, H.; Fuente, Eduardo de la; Abeysekara, Anushka Udara; Albert, A.; Alfaro, R.; Álvarez, C.; Romero, Juan de Dios Álvarez; Camacho, J.R.; Velázquez, Juan Carlos Arteaga; Kollamparambil, Arun Babu; Rojas, Daniel Omar Avila; Solares, Hugo Alberto Ayala; Babu, Rishi; Baghmanyan, Vardan; Barber, Ahron S.; González, J. Becerra; Belmont‐Moreno, E.; BenZvi, S.; Berley, D.; Brisbois, C.; Mora, Karen S. Caballero; Rojas, Tomás Capistrán; Carramiñana, A.; Casanova, S.; Chaparro-Amaro, Oscar; Cotti, U.; Cotzomi, J.; León, S. Coutińo de; León, Cederik León de; Diaz, Lorenzo; Hernández, R. Díaz; Díaz-Vélez, J. C.; Dingus, B. L.; Durocher, Mora; DuVernois, Michael; Ellsworth, R. W.; Engel, Kristi; Hernández, María Catalina Espinoza; Fan, Jason; Fang, Ke; Alonso, M. Fernández; Fick, B.; Fleischhack, Henrike; Flores, Jorge L.; Fraija, N.; Aguilar, Diego Garcia; García-González, J. A.; García–Luna, José Luis; García–Torales, Guillermo; Garfias, F.; Giacinti, Gwenael; Goksu, Hazal; González, M. M.; Goodman, J. A.; Harding, J. Patrick; Cadena, Sergio Hernández; Herzog, Ian; Hinton, Jim; Hona, B.; Huang, Dezhi; Hueyotl-Zahuantitla, Filiberto; Hui, C. M.; Humensky, Brian; Hüntemeyer, P.; Iriarte, A.; Jardin-Blicq, A.; Jhee, Hannah; Joshi, Vikas; Kieda, D.; Kunde, G. J.; Kunwar, S.; Lara, Alejandro; Lee, Jason; Lee, William H.; Lennarz, D.; Vargas, H. León; Linnemann, J. T.; Longinotti, A. L.; López-Coto, R.; Luis-Raya, G.; Lundeen, Joe; Malone, K.; Marandon, V.; Martı́nez, O.; Castellanos, Israel Martinez; Huerta, Humberto Martínez; Martínez-Castro, J.; Matthews, J. N.; McEnery, J. E.; Miranda-Romagnoli, P.; Soto, Jorge Antonio Morales; Barbosa, Eduardo Moreno; Mostafá, M.; Nayerhoda, A.; Nellen, Lukas; Newbold, M.; Nisa, Mehr; Noriega‐Papaqui, R.; Olivera-Nieto, Laura; Omodei, N.; Peisker, A.; Araujo, Yunior Pérez; Pérez, Eucario Gonzalo Pérez; Rho, Chang Dong; Rivière, C.; Rosa-González, D.; Ruiz-Velasco, E.; Ryan, James; Salazar, H.; Greus, F. Salesa; Sandoval, A.; Schneider, M.; Schoorlemmer, H.; Serna-Franco, José; Sinnis, G.; Smith, A. J.; Springer, R. W.; Surajbali, P.; Taboada, I.; Tanner, Meghan; Tollefson, K.; Torres, I.; Turner, Rhiannon; Ureña-Mena, Fernando; Villaseñor, L.; Wang, Xiaojie; Watson, I. J.; Weisgarber, T.; Werner, F.; Willox, Elijah; Wood, J.; Yodh, G.; Zepeda, A.; Mauro, Mattia Di; Hawc,

doi:10.22323/1.395.0842

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…The latest observations from the HAWC and H.E.S.S. experiments exhibit complex features in the gamma-ray spectrum of the Geminga halo (Torres Escobedo et al, 2021;Mitchell et al, 2021), which is likely attributed to the electron injection process of the Geminga PWN . The HAWC spectrum indicates a possible bump feature around 10 TeV.…”

Section: Pulsar Halos As Indicators Of Electron Injection From Pulsar...mentioning

confidence: 99%

Gamma-ray pulsar halos in the Galaxy

Fang

2022

Front. Astron. Space Sci.

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Pulsar halos are extended gamma-ray structures generated by electrons and positrons escaping from pulsar wind nebulae (PWNe), considered a new class of gamma-ray sources. They are ideal indicators for cosmic-ray propagation in localized regions of the Galaxy and particle escape process from PWNe. The cosmic-ray diffusion coefficient inferred from pulsar halos is more than two orders of magnitude smaller than the average value in the Galaxy, which has been arousing extensive discussion. We review the recent advances in the study of pulsar halos, including the characteristics of this class of sources, the known pulsar halos, the possible mechanisms of the extremely slow diffusion, the critical roles of pulsar halos in the studies of cosmic-ray propagation and electron injection from PWNe, and the implications on the problems of the cosmic positron excess and the diffuse TeV gamma-ray excess. Finally, we give prospects for the study in this direction based on the expectation of a larger sample of pulsar halos and deeper observations for bright sources.

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Section: Pulsar Halos As Indicators Of Electron Injection From Pulsar...mentioning

confidence: 99%

Gamma-ray pulsar halos in the Galaxy

Fang

2022

Front. Astron. Space Sci.

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“…Ref. [51] provides new data for the flux of Geminga measured by the HAWC collaboration, for γ-ray energies above 1 TeV within θ of 8 degrees around the source. These data, if combined with Fermi-LAT measurements between 10 GeV and 1 TeV, could constrain the e ± emission mechanisms across 4 orders of magnitude.…”

Section: Fit To the Flux Data Of Gemingamentioning

confidence: 99%

“…In addition, the data from HAWC released in ref. [51] are a factor of 3, larger than HAWC2017 so the spectral index must be redetermined. These two facts bring a large source of uncertainty in JCAP12(2022)007 the prediction of the positron flux and that the contribution of pulsars such as Geminga to the positron excess deserves more investigation.…”

Section: Introductionmentioning

confidence: 99%

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New estimate for the contribution of the Geminga pulsar to the positron excess

2022

J. Cosmol. Astropart. Phys.

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The origin of the positron excess is one of the most intriguing mysteries in astroparticle physics. The recent discovery of extended γ-ray halos around the pulsars Geminga, Monogem and PSR J0621+3755 have brought indirect evidence that pulsar wind nebulae accelerate e ± up to very-high-energy. While the precision of previous data does not permit precise evaluation of the parameters for the pulsars, we are able to find the more precise shape of the injection spectrum using new data released by HAWC and LHAASO in 2020 and 2021. We find that this is well fitten by a power-law with an exponential cutoff. The spectral index is quite hard with values around 1 while the cutoff energy is roughly 100 TeV. We also derive the strength of the diffusion coefficient around the pulsars finding that it is two orders of magnitude lower than the average of the Galaxy. Finally, we use the above mentioned results to estimate the contribution of Geminga to the positron excess. This source alone can contribute to the entire positron excess at around 1 TeV.

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Interpretation of the puzzling gamma-ray spectrum of the Geminga halo

Fang

2022

Phys. Rev. D

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Follow-up Analysis to Geminga's contribution to the Local Positron Excess with HAWC Gamma-Ray Observatory

Cited by 3 publications

References 10 publications

Gamma-ray pulsar halos in the Galaxy

Gamma-ray pulsar halos in the Galaxy

New estimate for the contribution of the Geminga pulsar to the positron excess

Interpretation of the puzzling gamma-ray spectrum of the Geminga halo

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