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@ARTICLE{Acharyya:640718,
      author       = {Acharyya, Atreya and Adams, Colin B. and Bangale,
                      Priyadarshini and Bartkoske, Joshua T. and Benbow, Wystan
                      and Buckley, J. H. and Chen, Yu and Christiansen, Jodi L.
                      and Chromey, Alisha J. and Duerr, Anne and Errando, Manel
                      and Godoy, Miguel E. and Falcone, Abe and Feldman, Sydney
                      and Feng, Qi and Foote, Juniper and Fortson, Lucy and
                      Furniss, Amy and Hanlon, William and Hanna, David and
                      Hervet, Olivier and Hinrichs, Claire E. and Holder, Jamie
                      and Humensky, Thomas B. and Jin, Weidong and Johnson,
                      Madalyn N. and Kaaret, Philip and Kertzman, Mary and
                      Kherlakian, Maria and Kieda, David and Kleiner, Tobias K.
                      and Korzoun, Nikolas and Krennrich, Frank and Kumar, Sajan
                      and Lang, Mark J. and Lundy, Matthew and Maier, Gernot and
                      Millard, Matthew J. and Mooney, Connor L. and Moriarty,
                      Patrick and Mukherjee, Reshmi and Ning, Wenmeng and Brien,
                      Stephan Ó. and Ong, Rene A. and Pohl, Martin and Pueschel,
                      Elisa and Quinn, John and Rabinowitz, Pazit L. and Ragan,
                      Kenneth J. and Reynolds, Paul T. and Ribeiro, Deivid and
                      Roache, Emmet and Sadeh, Iftach and Saha, Lab and Santander,
                      Marcos and Sembroski, Glenn H. and Shang, Ruo and
                      Splettstoesser, Megan and Tak, D. and Talluri, Anjana K. and
                      Tucci, James V. and Vassiliev, Vladimir V. and Williams,
                      David A. and Wong, Samantha L. and Woo, Jooyun},
      collaboration = {{VERITAS Collaboration}},
      title        = {{A}n {I}n-depth {S}tudy of {G}amma {R}ays from the
                      {S}tarburst {G}alaxy {M}82 with {VERITAS}},
      journal      = {The astrophysical journal / Part 1},
      volume       = {981},
      number       = {2},
      issn         = {0004-637X},
      address      = {London},
      publisher    = {Institute of Physics Publ.},
      reportid     = {PUBDB-2025-04857, arXiv:2501.09998. arXiv:2501.09998},
      pages        = {189},
      year         = {2025},
      note         = {15 pages, 7 figures; Accepted for the publication in The
                      Astrophysical Journal (ApJ)},
      abstract     = {Assuming Galactic cosmic rays originate in supernovae and
                      the winds of massive stars, starburst galaxies should
                      produce very-high-energy (VHE; E > 100 GeV) gamma-ray
                      emission via the interaction of their copious quantities of
                      cosmic rays with the large reservoirs of dense gas within
                      the galaxies. Such VHE emission was detected by VERITAS from
                      the starburst galaxy M82 in 2008–09. An extensive,
                      multiyear campaign followed these initial observations,
                      yielding a total of 254 hr of good-quality VERITAS data on
                      M82. Leveraging modern analysis techniques and the larger
                      exposure, these VERITAS data show a more statistically
                      significant VHE signal (∼6.5 standard deviations, σ). The
                      corresponding photon spectrum is well fit by a power law (Γ
                      = 2.3 ± 0.3$_{stat}$ ± 0.2$_{sys}$), and the observed
                      integral flux is F (>450 GeV) = (3.2 ± 0.6$_{stat}$ ±
                      0.6$_{sys}$) × 10$^{−13}$ cm$^{−2}$ s$^{−1}$, or
                      ∼0.4\% of the Crab Nebula flux above the same energy
                      threshold. The improved VERITAS measurements, when combined
                      with various multiwavelength data, enable modeling of the
                      underlying emission and transport processes. A purely
                      leptonic scenario is found to be a poor representation of
                      the gamma-ray spectral energy distribution (SED). A
                      lepto-hadronic scenario with cosmic rays following a
                      power-law spectrum in momentum (index s ≃ 2.25) and with
                      significant bremsstrahlung below 1 GeV provides a good match
                      to the observed SED. The synchrotron emission from the
                      secondary electrons indicates that efficient nonradiative
                      losses of cosmic-ray electrons may be related to advective
                      escape from the starburst core.},
      cin          = {$Z_VER$},
      ddc          = {520},
      cid          = {$I:(DE-H253)Z_VER-20210408$},
      pnm          = {613 - Matter and Radiation from the Universe (POF4-613)},
      pid          = {G:(DE-HGF)POF4-613},
      experiment   = {EXP:(DE-H253)VERITAS-20170101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2501.09998},
      howpublished = {arXiv:2501.09998},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2501.09998;\%\%$},
      doi          = {10.3847/1538-4357/adab71},
      url          = {https://bib-pubdb1.desy.de/record/640718},
}