HAWC

The High-Altitude Water Cherenkov Gamma-Ray Observatory

The HAWC Collaboration

HAWC is an international collaboration between more than thirty institutions in Mexico, the United States, Europe, South America, and Asia.

Spokesperson (US):Ke Fang
Spokesperson (Mexico):Maria Magdalena González Sanchez
Science Coordinator:Hugo Ayala Solares
Multi-wavelength/multi-messenger Coordinator:Hugo Ayala Solares
HAWC Collaboration
The HAWC Collaboration: April 2024, CDMX, Mexico.

Institutions in Mexico

  1. Benemérita Universidad Autónoma de Puebla (BUAP)
  2. Centro de Investigación y de Estudios Avanzados (CINVESTAV)
  3. Instituto Nacional de Astrofísica Óptica y Electrónica (INAOE)
  4. Centro de Investigacion en Computacion, Instituto Politecnico Nacional (CIC-IPN)
  5. Universidad de Guadalajara
  6. Universidad Autónoma de Chiapas
  7. Universidad Autónoma del Estado de Hidalgo
  8. Instituto de Astronomía, Universidad Nacional Autónoma de México (IA-UNAM)
  9. Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México (ICN-UNAM)
  10. Instituto de Física, Universidad Nacional Autónoma de México (IF-UNAM)
  11. Instituto de Geofísica, Universidad Nacional Autónoma de México (IGeof-UNAM)
  12. Universidad Michoacana de San Nicolás de Hidalgo (UMSNH)
  13. Universidad Politecnica de Pachuca

Institutions in the United States

  1. California University of Pennsylvania
  2. George Mason University
  3. Georgia Institute of Technology
  4. Los Alamos National Laboratory
  5. Michigan State University
  6. Michigan Technological University
  7. NASA/Goddard Space Flight Center
  8. NASA Marshall Space Flight Center
  9. Pennsylvania State University
  10. Stanford University
  11. University of California, Irvine
  12. University of Maryland
  13. University of New Hampshire
  14. University of New Mexico
  15. University of Rochester
  16. University of Utah
  17. University of Wisconsin-Madison

Institutions in Europe

  1. Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
  2. IFJ-PAN, Krakow, Poland
  3. National Institute for Nuclear Physics, Padova Division, Italy
  4. Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Institutions in South America

  1. São Carlos Institute of Physics, University of São Paulo, Brazil

Institutions in Asia

  1. Tsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University
  2. University of Seoul, South Korea
  3. Sungkyunkwan University, South Korea

List of Authors

Anushka Udara Abeysekara29, Andrea Albert17, Ruben Alfaro10, César Alvarez6, Juan D. Álvarez12, Jose Roberto Angeles Camacho10, Juan C. Arteaga-Velázquez12, Kollam P. Arunbabu11, Daniel Avila Rojas10, Hugo Alberto Ayala Solares22, Rishi Babu19, Vardan Baghmanyan32, Ahron S. Barber29, Josefa Becerra Gonzalez20,25, Ernesto Belmont-Moreno10, Segev Y. BenZvi28, David Berley25, Chad Brisbois25, Karen S. Caballero-Mora6, Tomas Capistrán3, Alberto Carramiñana3, Sabrina Casanova32,34, Oscar Chaparro-Amaro4, Umberto Cotti12, Jorge Cotzomi1, Sara Coutiño de León3, Eduardo De la Fuente5, Cederik de León12, Lorenzo Diaz-Cruz1, Raquel Diaz Hernandez3, Juan C. Díaz-Vélez5,30, Brenda L. Dingus17, Mora Durocher17, Michael A. DuVernois30, Robert W. Ellsworth25, Kristi Engel25, Catalina Espinoza10, Kwok Lung Fan25, Ke Fang30, Mateo Fernández Alonso22, Brian Fick19, Henrike Fleischhack19, Jorge L. Flores5, Nissim I. Fraija8, Diego Garcia10, José A. García-González10, José L. García-Luna5, Guillemo García-Torales5, Fernando Garfias8, Gwenael Giacinti34, Hazal Goksu34, Maria M. González8, Jordan A. Goodman25, J. Patrick Harding17, Sergio Hernandez10, Ian Herzog19, Jim Hinton34, Binita Hona29, Dezhi Huang19, Filiberto Hueyotl-Zahuantitla6, Chiumun Michelle Hui21, Brian Humensky25, Petra Hüntemeyer19, Arturo Iriarte8, Armelle Jardin-Blicq34, Hannah Jhee37, Vikas Joshi31, David Kieda29, Gerd J. Kunde17, Samridha Kunwar34, Alejandro Lara11, Jason Lee37, William H. Lee8, Dirk Lennarz16, Hermes León Vargas10, James T. Linnemann18, Anna L. Longinotti3, Rubén López-Coto33, Gilgamesh Luis-Raya13, Joe Lundeen18, Kelly Malone17, Vincent Marandon34, Oscar Martinez1, Israel Martinez-Castellanos25, Jesús Martínez-Castro4, Humberto Martínez-Huerta35, John A. J. Matthews27, Julie McEnery20, Pedro Miranda-Romagnoli7, Jorge A. Morales-Soto12, Eduardo Moreno1, Miguel Mostafá22, Amid Nayerhoda32, Lukas Nellen9, Michael Newbold29, Mehr U. Nisa18, Roberto Noriega-Papaqui7, Laura Olivera-Nieto34, Nicola Omodei23, Alison Peisker18, Yunior Pérez Araujo8, Eucario G. Pérez-Pérez13, Chang Dong Rho37, Colas Rivière25, Daniel Rosa-González3, Matthew Rosenberg22, Edna Ruiz-Velasco34, James Ryan26, Humberto Salazar1, Francisco Salesa Greus32, Andres Sandoval10, Michael Schneider25, Harm Schoorlemmer34, José Serna-Franco10, Gus Sinnis17, Andrew J. Smith25, R. Wayne Springer29, Pooja Surajbali34, Ignacio Taboada16, Meghan Tanner22, Kirsten Tollefson18, Ibrahim Torres3, Ramiro Torres-Escobedo5, Rhiannon Turner19, Fernando Ureña-Mena3, Luis Villaseñor1, Xiaojie Wang19, Ian J. Watson37, Thomas Weisgarber30, Felix Werner34, Elijah Willox25, S. Yun-Cárcamo25, Josh Wood21, Gaurang B. Yodh24, Arnulfo Zepeda2, Hao Zhou36

The HAWC awards

These awards, were created in memory of Stefan Westerhoff, Gaurang Yodh and Arnulfo Zepeda, to celebrate and recognize important contributions to the success of HAWC. They recognize contributions that have had a strong impact on HAWC operations, performance, data analysis and science interpretation.

Award from November 2023, Puerto Vallarta, Mexico

Manuel Odilón de Rosas Sandoval (Gaurang Yodh award)

Manuel
Manuel Odilón de Rosas Sandoval

Manuel exhibited exceptional expertise, professionalism, and unwavering dedication as a key member of the HAWC operations team. Manuel had an extraordinary ability to diagnose and resolve intricate challenges, collaborated seamlessly and willingly shouldered new responsibilities as the need arose. His contributions were indispensable in ensuring the smooth and efficient functioning of the HAWC observatory. In recognition of his exceptional contributions to the HAWC Observatory.

Award from May 2023, Puebla, Mexico

Hugo Alberto Ayala Solares (Arnulfo Zepeda award)

Hugo
Hugo Alberto Ayala Solares

For his exceptional contributions to HAWC. He pioneered a NKG-based core reconstruction and developed hit selection for outriggers; contributed to installation the laser calibration system; his systematic studies improved background estimation algorithms and calibration system performance; he also distributes timely online HAWC transient alerts, served as Multiwavelength and as Science coordinator, and consistently lends a hand to HAWC collaborators at all levels. He led analyses of the Northern Fermi Bubble and of Giant Molecular Clouds.

Award from October 2022, hybrid meeting

Hao Zhou (Stefan Westerhoff award)

Hao
Hao Zhou

For his development of the first HAWC laser timing and charge calibration, service and leadership as the galactic analysis coordinator and then as reconstruction algorithm coordinator, developing the first HAWC source catalog; and analysis of the Geminga and Monogem PWNs with a diffusion model leading to discovery of TeV halos with low diffusion constant.

Awards from May 2022, hybrid meeting

Kelly Malone (Stefan Westerhoff award)

KellyMalone
Kelly Malone

For her development of a new robust energy estimator based on the shower lateral distribution, which significantly improved HAWC energy resolution; her efforts on measuring and characterizing HAWC phototubes; and her leadership in the analysis of the newly-identified high energy sources and their spectra.

Israel Martínez Castellanos (Gaurang Yodh award)

Israel
Israel Martínez Castellanos

For his strong participation in many software developments including the ZEBRA software, online software, automated reporting of searching for transient sources; and leading analysis ``bootcamps'' enabling broader contributions to HAWC analysis from across the collaboration.

Samuel Marinelli (Arnulfo Zepeda award)

SamMarinelli
Samuel Marinelli

For his pioneering development of a neural-net based energy estimator combining many shower characteristics, which significantly improved HAWC energy resolution; his contributions to online remote monitoring and operations of HAWC; and his analysis of photons above 100 TeV in energy, including limits on violation of Lorentz invariance.

HAWC diversity statement

The HAWC Collaboration believes that both science and society are strengthened when we bring together people with the broadest spectrum of backgrounds and experiences. We support the professional development and scientific growth of all collaboration members, regardless of characteristics such as race, ethnicity, sex, gender, sexual orientation, physical ability, gender identity or expression, economic status, country of origin, or religion. We recognize that those who belong to underrepresented groups experience barriers to fully participating in science. Despite our stated commitment to diversity, equity, and inclusion in our research activities, we recognize that we must do significantly more to bring change to our collaboration, our institutions, our countries and society as a whole. We must work to remove barriers that prevent underrepresented groups from gaining access to academic and scientific pursuits and institutions, and we recognize that this begins with fully and actively supporting basic human rights for all people. Locally, we celebrate achievements made by those who are already here and aim to actively work on issues such as recruitment, retention, and mentoring of people belonging to these groups in order to allow everyone to reach their full potential. As members of the HAWC Collaboration, we recognize that we are privileged in our positions as scientists and have a responsibility to speak out against discrimination and oppression in all its forms and to demand justice.

Acknowledgments

We acknowledge the support from: the US National Science Foundation (NSF); the US Department of Energy Office of High-Energy Physics; the Laboratory Directed Research and Development (LDRD) program of Los Alamos National Laboratory; Consejo Nacional de Ciencia y Tecnolog\'ia (CONACyT), M\'exico, grants 271051, 232656, 260378, 179588, 254964, 258865, 243290, 132197, A1-S-46288, A1-S-22784, c\'atedras 873, 1563, 341, 323, Red HAWC, M\'exico; DGAPA-UNAM grants IG101320, IN111716-3, IN111419, IA102019, IN110621, IN110521; VIEP-BUAP; PIFI 2012, 2013, PROFOCIE 2014, 2015; the University of Wisconsin Alumni Research Foundation; the Institute of Geophysics, Planetary Physics, and Signatures at Los Alamos National Laboratory; Polish Science Centre grant, DEC-2017/27/B/ST9/02272; Coordinaci\'on de la Investigaci\'on Cient\'ifica de la Universidad Michoacana; Royal Society - Newton Advanced Fellowship 180385; Generalitat Valenciana, grant CIDEGENT/2018/034; Chulalongkorn University’s CUniverse (CUAASC) grant; Coordinaci\'on General Acad\'emica e Innovaci\'on (CGAI-UdeG), PRODEP-SEP UDG-CA-499; Institute of Cosmic Ray Research (ICRR), University of Tokyo, H.F. acknowledges support by NASA under award number 80GSFC21M0002. We also acknowledge the significant contributions over many years of Stefan Westerhoff, Gaurang Yodh and Arnulfo Zepeda Dominguez, all deceased members of the HAWC collaboration. Thanks to Scott Delay, Luciano D\'iaz and Eduardo Murrieta for technical support.