A search for spectral hardening in HAWC sources above 56 TeV

Abeysekara AU, Albert A, Alfaro R, Alvarez C, Álvarez JD, Angeles Camacho JR, Arteaga-Velázquez JC, Arunbabu KP, Avila Rojas D, Ayala Solares HA, Babu R, Baghmanyan V, Barber AS, Becerra Gonzalez J, Belmont-Moreno E, BenZvi SY, Berley D, Brisbois C, Caballero-Mora KS, Capistrán T, Carramiñana A, Casanova S, Chaparro-Amaro O, Cotti U, Cotzomi J, Coutiño de León S, De la Fuente E, de León C, Diaz-Cruz L, Diaz Hernandez R, Díaz-Vélez JC, Dingus BL, Durocher M, DuVernois MA, Ellsworth RW, Engel K, Espinoza C, Fan KL, Fang K, Fernández Alonso M, Fick B, Fleischhack H, Flores JL, Fraija NI, Garcia D, García-González JA, García-Luna JL, García-Torales G, Garfias F, Giacinti G, Goksu H, González MM, Goodman JA, Harding JP, Hernandez S, Herzog I, Hinton J, Hona B, Huang D, Hueyotl-Zahuantitla F, Hui CM, Humensky B, Hüntemeyer P, Iriarte A, Jardin-Blicq A, Jhee H, Joshi V, Kieda D, Kunde GJ, Kunwar S, Lara A, Lee J, Lee WH, Lennarz D, León Vargas H, Linnemann J, Longinotti AL, López-Coto R, Luis-Raya G, Lundeen J, Malone K, Marandon V, Martinez O, Martinez-Castellanos I, Martínez-Huerta H, Martínez-Castro J, Matthews JA, McEnery J, Miranda-Romagnoli P, Morales-Soto JA, Moreno E, Mostafá M, Nayerhoda A, Nellen L, Newbold M, Nisa MU, Noriega-Papaqui R, Olivera-Nieto L, Omodei N, Peisker A, Pérez Araujo Y, Pérez-Pérez EG, Rho CD, Rivière C, Rosa-Gonzalez D, Ruiz-Velasco E, Ryan J, Salazar H, Salesa Greus F, Sandoval A, Schneider M, Schoorlemmer H, Serna-Franco J, Sinnis G, Smith AJ, Springer RW, Surajbali P, Taboada I, Tanner M, Tollefson K, Torres I, Torres-Escobedo R, Turner R, Ureña-Mena F, Villaseñor L, Wang X, Watson IJ, Weisgarber T, Werner F, Willox E, Wood J, Yodh GB, Zepeda A, Zhou H (2022)

Publication Type: Conference contribution

Publication year: 2022

Journal

Publisher: Sissa Medialab Srl

Book Volume: 395

Conference Proceedings Title: Proceedings of Science

Event location: Virtual, Berlin, DEU

Abstract

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.

Authors with CRIS profile

Involved external institutions

University of Maryland United States (USA) (US) Universidad de Guadalajara (UDEG) Mexico (MX) Los Alamos National Laboratory United States (USA) (US) Max-Planck-Institut für Kernphysik (MPIK) / Max Planck Institute for Nuclear Physics Germany (DE) University of New Hampshire United States (USA) (US) Benemérita Universidad Autónoma de Puebla (BUAP) / Meritorious Autonomous University of Puebla Mexico (MX) Institute of Nuclear Physics Polish Academy of Sciences / Instytut Fizyki Jądrowej im. Henryka Niewodniczańskiego Polskiej Akademii Nauk Poland (PL) National Autonomous University of Mexico / Universidad Nacional Autónoma de México (UNAM) Mexico (MX) Georgia Institute of Technology United States (USA) (US) National Institute of Astrophysics, Optics and Electronics / Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE) Mexico (MX) University of Utah United States (USA) (US) National Aeronautics and Space Administration (NASA) United States (USA) (US) Universidad Autónoma de Chiapas (UNACH) Mexico (MX) Universidad Michoacana de San Nicolás de Hidalgo (UMSNH) Mexico (MX) Pennsylvania State University (Penn State) United States (USA) (US) Michigan Technological University United States (USA) (US) University of Wisconsin - Madison United States (USA) (US) University of Seoul (UOS) / 서울시립대학교 Korea, Republic of (KR) Tecnológico de Monterrey (ITESM) Mexico (MX) National Polytechnic Institute of Mexico / Instituto Politécnico Nacional de México Mexico (MX) Autonomous University of the State of Hidalgo / Universidad Autónoma del Estado de Hidalgo Mexico (MX) University of Rochester (UR) United States (USA) (US) Universidad Politécnica de Pachuca (UPP) Mexico (MX) Michigan State University United States (USA) (US) Universidad de Monterrey (UDEM) Mexico (MX) University of New Mexico (UNM) / Universidad de Nuevo México United States (USA) (US) Stanford University United States (USA) (US) University of California Irvine United States (USA) (US) Shanghai Jiao Tong University / 上海交通大学 China (CN) National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) Italy (IT)

How to cite

APA:

Abeysekara, A.U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J.D., Angeles Camacho, J.R.,... Zhou, H. (2022). A search for spectral hardening in HAWC sources above 56 TeV. In Proceedings of Science. Virtual, Berlin, DEU: Sissa Medialab Srl.

MLA:

Abeysekara, A. U., et al. "A search for spectral hardening in HAWC sources above 56 TeV." Proceedings of the 37th International Cosmic Ray Conference, ICRC 2021, Virtual, Berlin, DEU Sissa Medialab Srl, 2022.

BibTeX: Download