HAWC observations of the acceleration of very-high-energy cosmic rays in the Cygnus Cocoon

Abeysekara, Anushka Udara; Albert, A.; Alfaro, R.; Álvarez, C.; Camacho, J.R.; Arteaga‐Velázquez, J. C.; Arunbabu, K. P.; Rojas, D. Avila; Solares, H. A. Ayala; Baghmanyan, Vardan; Belmont‐Moreno, E.; BenZvi, S.; Blandford, R. D.; Brisbois, C.; Caballero-Mora, K. S.; Capistrán, T.; Carramiñana, A.; Casanova, S.; Cotti, U.; León, S. Coutińo de; Fuente, Eduardo de la; Hernández, R. Díaz; Dingus, B. L.; DuVernois, Michael; Durocher, Mora; Díaz-Vélez, J. C.; Ellsworth, R. W.; Engel, Kristi; Espinoza, C.; Fan, Kwok Lung; Fang, Kun; Fleischhack, Henrike; Fraija, N.; Galván-Gaméz, A.; García, D. Ramírez; García-González, J. A.; Garfias, F.; Giacinti, Gwenael; González, M. M.; Goodman, J. A.; Harding, J. Patrick; Hernández, S.; Hinton, J. A.; Hona, B.; Huang, D.; Hueyotl-Zahuantitla, F.; Hüntemeyer, P.; Iriarte, A.; Jardin-Blicq, A.; Joshi, Vikas; Kieda, D.; Lara, A.; Lee, W. H.; Vargas, H. León; Linnemann, J.; Longinotti, A. L.; Luis-Raya, G.; Lundeen, J.; Malone, K.; Martı́nez, O.; Martínez-Castellanos, I.; Martínez-Castro, J.; Matthews, John; Miranda-Romagnoli, P.; Morales-Soto, J. A.; Moreno, E.; Mostafá, M.; Nayerhoda, A.; Nellen, Lukas; Newbold, M.; Nisa, Mehr; Noriega‐Papaqui, R.; Olivera-Nieto, Laura; Omodei, N.; Peisker, A.; Araujo, Yunior Pérez; Pérez-Pérez, E. G.; Ren, Z.; Rho, Chang Dong; Rosa-González, D.; Ruiz-Velasco, E.; Salazar, H.; Greus, F. Salesa; Sandoval, A.; Schneider, M.; Schoorlemmer, H.; Serna, F.; Smith, A. J.; Springer, R. W.; Surajbali, P.; Tollefson, K.; Torres, I.; Torres-Escobedo, R.; Ureña-Mena, Fernando; Weisgarber, T.; Werner, F.; Willox, Elijah; Zepeda, A.; Zhou, H.; León, C. De; Álvarez, José David Ruiz

doi:10.1038/s41550-021-01318-y

Cited by 97 publications

(100 citation statements)

References 44 publications

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“…In addition, 4 events out of 23 gamma rays located within | | < 10 • above 398 TeV concentrate in the Cygnus Cocoon region (around = 80 • , = +1 • in Fig. 1), which is a good candidate of the PeVatron [11][12][13]. This result may provide further strong evidence that the Cygnus Cocoon is a cosmic-ray source "Pevatron".…”

Section: Pos(icrc2021)795mentioning

confidence: 69%

Observation of ultra-high-energy diffuse gamma rays from the galactic plane with the Tibet air shower array

Kawata¹

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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We reported on the first detection of the ultra-high-energy diffuse gamma rays from the Galactic plane [1]. The highest energy of the detected gamma rays is estimated to be unprecedentedly high, nearly 1 PeV. It is reasonable to expect that the detected gamma rays are produced by the hadronic interaction between cosmic rays escaping from the most powerful Galactic sources "PeVatrons" and the interstellar gas in the Galaxy. This experimental evidence is an important milestone to solve a long-standing mystery of cosmic-ray origins.

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Section: Pos(icrc2021)795mentioning

confidence: 69%

Observation of ultra-high-energy diffuse gamma rays from the galactic plane with the Tibet air shower array

Kawata¹

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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“…For example, 3HWC J2031+415 has been resolved into multiple sources. As discussed in [7], this region actually consists of a large extended source (the Cygnus cocoon) along with a high-energy pulsar. We simply use the reported best-fit spectral shapes and morphology from [7].…”

Section: Pos(icrc2021)811mentioning

confidence: 98%

A search for spectral hardening in HAWC sources above 56 TeV

Hawc¹,

Abeysekara²,

Albert³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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The High Altitude Water Cherenkov (HAWC) Observatory is a wide-field-of-view gamma-ray observatory that is optimized to detect gamma rays between 300 GeV and several hundred TeV. The HAWC Collaboration recently released their third source catalog (3HWC), which contains 65 sources. One of these sources, the ultra-high-energy gamma-ray source 3HWC J1908+063, may exhibit a hardening of the spectral index at the highest energies (above 56 TeV). At least two populations of particles are needed to satisfactorily explain the highest energy emission. This second component could be leptonic or hadronic in origin. If it is hadronic in origin, it would imply the presence of protons with energies up to ∼1 PeV near the source. We have searched other 3HWC sources for the presence of this spectral hardening feature. If observed, this would imply that the sources could make good PeVatron candidates.

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“…In this work, we are focusing of the Cygnus X region, located in the local arm at approximately 1.4 kpc from the solar system. A study of the Cygnus X region has already unveiled a cocoon of freshly accelerated [2] and more recently the Cygnus cocoon has been observed using HAWC data above 1TeV [3]. Other studies show the existence of potential -ray signals toward some MSFRs ( [4], [5], [6], [7], [8], [9]), but not others ( [10], [11]).…”

Section: Introductionmentioning

confidence: 97%

Investigating gamma-ray emission of the Cygnus cocoon with 12 years of Fermi-LAT data

Astiasarain¹,

Tibaldo²,

Martin³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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HAWC observations of the acceleration of very-high-energy cosmic rays in the Cygnus Cocoon

Cited by 97 publications

References 44 publications

Observation of ultra-high-energy diffuse gamma rays from the galactic plane with the Tibet air shower array

Observation of ultra-high-energy diffuse gamma rays from the galactic plane with the Tibet air shower array

A search for spectral hardening in HAWC sources above 56 TeV

Investigating gamma-ray emission of the Cygnus cocoon with 12 years of Fermi-LAT data

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