Published April 10, 2020 | Version Accepted Version + Published
Journal Article Open

Constraints on the Emission of Gamma-Rays from M31 with HAWC

  • 1. ROR icon Los Alamos National Laboratory
  • 2. ROR icon National Autonomous University of Mexico
  • 3. ROR icon Autonomous University of Chiapas
  • 4. ROR icon Universidad Michoacana de San Nicolás de Hidalgo
  • 5. ROR icon Pennsylvania State University
  • 6. ROR icon University of Rochester
  • 7. ROR icon Michigan Technological University
  • 8. ROR icon National Institute of Astrophysics, Optics and Electronics
  • 9. ROR icon Institute of Nuclear Physics, Polish Academy of Sciences
  • 10. ROR icon Benemérita Universidad Autónoma de Puebla
  • 11. ROR icon University of Guadalajara
  • 12. ROR icon University of Wisconsin–Madison
  • 13. ROR icon University of Maryland, College Park
  • 14. ROR icon Max Planck Institute for Nuclear Physics
  • 15. ROR icon University of Utah
  • 16. ROR icon Universidad Politécnica de Pachuca
  • 17. ROR icon Michigan State University
  • 18. ROR icon Instituto Politécnico Nacional
  • 19. ROR icon University of New Mexico
  • 20. ROR icon Universidad Autónoma del Estado de Hidalgo
  • 21. ROR icon University of Seoul
  • 22. ROR icon California Institute of Technology
  • 23. ROR icon Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional

Abstract

Cosmic rays, along with stellar radiation and magnetic fields, are known to make up a significant fraction of the energy density of galaxies such as the Milky Way. When cosmic rays interact in the interstellar medium, they produce gamma-ray emission which provides an important indication of how the cosmic rays propagate. Gamma-rays from the Andromeda galaxy (M31), located 785 kpc away, provide a unique opportunity to study cosmic-ray acceleration and diffusion in a galaxy with a structure and evolution very similar to the Milky Way. Using 33 months of data from the High Altitude Water Cherenkov Observatory, we search for teraelectronvolt gamma-rays from the galactic plane of M31. We also investigate past and present evidence of galactic activity in M31 by searching for Fermi bubble-like structures above and below the galactic nucleus. No significant gamma-ray emission is observed, so we use the null result to compute upper limits on the energy density of cosmic rays >10 TeV in M31.

Additional Information

© 2020 The American Astronomical Society. Received 2020 January 6; revised 2020 February 22; accepted 2020 February 23; published 2020 April 8. We acknowledge 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 Tecnología (CONACyT), México, grants 271051, 232656, 260378, 179588, 254964, 258865, 243290, 132197, A1-S-46288, A1-S-22784, cátedras 873, 1563, 341, 323, Red HAWC, México; DGAPA-UNAM grants AG100317, IN111315, IN111716-3, IN111419, IA102019, IN112218; 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-2018/31/B/ST9/01069, DEC-2017/27/B/ST9/02272; Coordinación de la Investigación Científica de la Universidad Michoacana; Royal Society—Newton Advanced Fellowship 180385. Thanks to Scott Delay, Luciano Díaz and Eduardo Murrieta for technical support. Software: threeML/hawc-hal (https://github.com/threeML), AERIE-LiFF (https://github.com/rjlauer/aerie-liff, HAWC Collaboration).

Attached Files

Published - Albert_2020_ApJ_893_16.pdf

Accepted Version - 2001.04065.pdf

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2001.04065.pdf

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Additional details

Identifiers

Eprint ID
102970
Resolver ID
CaltechAUTHORS:20200504-081620984

Related works

Funding

NSF
Department of Energy (DOE)
Los Alamos National Laboratory
Consejo Nacional de Ciencia y Tecnología (CONACyT)
271051
Consejo Nacional de Ciencia y Tecnología (CONACyT)
232656
Consejo Nacional de Ciencia y Tecnología (CONACyT)
260378
Consejo Nacional de Ciencia y Tecnología (CONACyT)
179588
Consejo Nacional de Ciencia y Tecnología (CONACyT)
254964
Consejo Nacional de Ciencia y Tecnología (CONACyT)
258865
Consejo Nacional de Ciencia y Tecnología (CONACyT)
243290
Consejo Nacional de Ciencia y Tecnología (CONACyT)
132197
Consejo Nacional de Ciencia y Tecnología (CONACyT)
A1-S-46288
Consejo Nacional de Ciencia y Tecnología (CONACyT)
A1-S-22784
Consejo Nacional de Ciencia y Tecnología (CONACyT)
cátedras 873
Consejo Nacional de Ciencia y Tecnología (CONACyT)
cátedras 1563
Consejo Nacional de Ciencia y Tecnología (CONACyT)
cátedras 341
Consejo Nacional de Ciencia y Tecnología (CONACyT)
cátedras 323
Dirección General Asuntos del Personal Académico, Universidad Nacional Autónoma de México (DGAPA-UNAM)
AG100317
Dirección General Asuntos del Personal Académico, Universidad Nacional Autónoma de México (DGAPA-UNAM)
IN111315
Dirección General Asuntos del Personal Académico, Universidad Nacional Autónoma de México (DGAPA-UNAM)
IN111716-3
Dirección General Asuntos del Personal Académico, Universidad Nacional Autónoma de México (DGAPA-UNAM)
IN111419
Dirección General Asuntos del Personal Académico, Universidad Nacional Autónoma de México (DGAPA-UNAM)
IA102019
Dirección General Asuntos del Personal Académico, Universidad Nacional Autónoma de México (DGAPA-UNAM)
IN112218
Benemérita Universidad Autónoma de Puebla (BUAP)
Dirección General Asuntos del Personal Académico, Universidad Nacional Autónoma de México (DGAPA-UNAM)
PIFI 2012, 2013
Dirección General Asuntos del Personal Académico, Universidad Nacional Autónoma de México (DGAPA-UNAM)
PROFOCIE 2014, 2015
University of Wisconsin Alumni Research Foundation
Institute of Geophysics and Planetary Physics
National Science Centre (Poland)
DEC-2018/31/B/ST9/01069
National Science Centre (Poland)
DEC-2017/27/B/ST9/02272
Coordinación de la Investigación Científica de la Universidad Michoacana
Royal Society
180385

Dates

Created
2020-05-04
Created from EPrint's datestamp field
Updated
2021-11-16
Created from EPrint's last_modified field