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@ARTICLE{Adams:642351,
      author       = {Adams, C. B. and Bangale, P. and Benbow, W. and Buckley, J.
                      H. and Chen, Y. and Christiansen, J. L. and Chromey, A. J.
                      and Godoy, M. Escobar and Feldman, S. and Feng, Q. and
                      Foote, J. and Fortson, L. and Furniss, A. and Hanlon, W. and
                      Hervet, O. and Hinrichs, C. E. and Holder, J. and Hughes, Z.
                      and Humensky, T. B. and Jin, W. and Kaaret, P. and Kertzman,
                      M. and Kherlakian, M. and Kieda, D. and Kleiner, Tobias Kai
                      and Korzoun, N. and Kumar, S. and Lang, M. J. and Lundy, M.
                      and Maier, G. and Millard, M. J. and Moriarty, P. and
                      Mukherjee, R. and Ning, W. and Ong, R. A. and Pohl, M. and
                      Pueschel, E. and Quinn, J. and Rabinowitz, P. L. and Ragan,
                      K. and Reynolds, P. T. and Ribeiro, D. and Roache, E. and
                      Sadeh, I. and Saha, L. and Sembroski, G. H. and Shang, R.
                      and Tak, D. and Talluri, A. K. and Tucci, J. V. and
                      Valverde, J. and Williams, D. A. and Wong, S. L. and Woo, J.
                      and Alfaro, R. and Alvarez, C. and Arteaga-Velázquez, J. C.
                      and Rojas, D. Avila and Babu, R. and Belmont-Moreno, E. and
                      Bernal, A. and Caballero-Mora, K. S. and Carramiñana, A.
                      and Casanova, S. and Cotti, U. and Cotzomi, J. and De la
                      Fuente, E. and de León, C. and Depaoli, D. and Desiati, P.
                      and Di Lalla, N. and Hernandez, R. Diaz and DuVernois, M. A.
                      and Engel, K. and Ergin, T. and Espinoza, C. and Fan, K. L.
                      and Fraija, N. and Fraija, S. and García-González, J. A.
                      and Garfias, F. and Muñoz, A. Gonzalez and González, M. M.
                      and Goodman, J. A. and Groetsch, S. and Harding, J. P. and
                      Hernandez-Cadena, S. and Herzog, I. and Huang, D. and
                      Hueyotl-Zahuantitla, F. and Hüntemeyer, P. and Iriarte, A.
                      and Kaufmann, S. and Lara, A. and Lee, J. and León Vargas,
                      H. and Longinotti, A. L. and Luis-Raya, G. and Malone, K.
                      and Martinez, O. and Martínez-Castro, J. and Matthews, J.
                      A. and Miranda-Romagnoli, P. and Morales-Soto, J. A. and
                      Moreno, E. and Araya, M. and Mostafá, M. and Najafi, M. and
                      Nayerhoda, A. and Nellen, L. and Omodei, N. and Ponce, E.
                      and Pérez-Pérez, E. G. and Rho, C. D. and Rosa-González,
                      D. and Roth, M. and Salazar, H. and Sandoval, A. and
                      Schneider, M. and Serna-Franco, J. and Smith, A. J. and Son,
                      Y. and Springer, R. W. and Tibolla, O. and Tollefson, K. and
                      Torres, I. and Torres-Escobedo, R. and Turner, R. and
                      Ureña-Mena, F. and Varela, E. and Villaseñor, L. and Wang,
                      X. and Wang, Z. and Watson, I. J. and Wu, H. and Yu, S. and
                      Yun-Cárcamo, S. and Zhou, H. and Martin, M. and Mori, Kaya
                      and Hailey, Charles J. and Safi-Harb, Samar and Zhang, And
                      Shuo},
      collaboration = {{VERITAS Collaboration} and XMM-{Newton Collaboration} and
                      {HAWC Collaboration}},
      title        = {{HAWC}, {VERITAS}, {F}ermi-{LAT} and {XMM}-{N}ewton
                      follow-up observations of the unidentified ultra-high-energy
                      gamma-ray source {LHAASO} {J}2108+5157},
      reportid     = {PUBDB-2025-05506, arXiv:2508.01934},
      year         = {2025},
      note         = {12 pages, 4 figures, submitted to The Astrophysical
                      Journal},
      abstract     = {We report observations of the ultra-high-energy gamma-ray
                      source LHAASO J2108$+$5157, utilizing VERITAS, HAWC,
                      Fermi-LAT, and XMM-Newton. VERITAS has collected $\sim$ 40
                      hours of data that we used to set ULs to the emission above
                      200 GeV. The HAWC data, collected over $\sim 2400$ days,
                      reveal emission between 3 and 146 TeV, with a significance
                      of $7.5~σ$, favoring an extended source model. The best-fit
                      spectrum measured by HAWC is characterized by a simple
                      power-law with a spectral index of $2.45\pm0.11_{stat}$.
                      Fermi-LAT analysis finds a point source with a very soft
                      spectrum in the LHAASO J2108+5157 region, consistent with
                      the 4FGL-DR3 catalog results. The XMM-Newton analysis yields
                      a null detection of the source in the 2 - 7 keV band. The
                      broadband spectrum can be interpreted as a pulsar and a
                      pulsar wind nebula system, where the GeV gamma-ray emission
                      originates from an unidentified pulsar, and the X-ray and
                      TeV emission is attributed to synchrotron radiation and
                      inverse Compton scattering of electrons accelerated within a
                      pulsar wind nebula. In this leptonic scenario, our X-ray
                      upper limit provides a stringent constraint on the magnetic
                      field, which is $\lesssim 1.5\ μ$G.},
      cin          = {$Z_GA$},
      cid          = {$I:(DE-H253)Z_GA-20210408$},
      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)25},
      eprint       = {2508.01934},
      howpublished = {arXiv:2508.01934},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2508.01934;\%\%$},
      doi          = {10.3204/PUBDB-2025-05506},
      url          = {https://bib-pubdb1.desy.de/record/642351},
}