TY  - EJOUR
AU  - Adams, C. B.
AU  - Archer, A.
AU  - Bangale, P.
AU  - Bartkoske, J. T.
AU  - Benbow, W.
AU  - Chen, Y.
AU  - Christiansen, J. L.
AU  - Chromey, A. J.
AU  - Duerr, A.
AU  - Errando, M.
AU  - Godoy, M. Escobar
AU  - Escudero Pedrosa, J.
AU  - Feldman, S.
AU  - Feng, Q.
AU  - Filbert, S.
AU  - Fortson, L.
AU  - Furniss, A.
AU  - Hanlon, W.
AU  - Hervet, O.
AU  - Hinrichs, C. E.
AU  - Holder, J.
AU  - Hughes, Z.
AU  - Humensky, T. B.
AU  - Iskakova, M.
AU  - Jin, W.
AU  - Kaaret, P.
AU  - Kertzman, M.
AU  - Kherlakian, M.
AU  - Kieda, D.
AU  - Kleiner, T. K.
AU  - Korzoun, N.
AU  - Krennrich, F.
AU  - Kumar, S.
AU  - Kundu, S.
AU  - Lang, M. J.
AU  - Lundy, M.
AU  - Moriarty, P.
AU  - Mukherjee, R.
AU  - Ning, W.
AU  - Ong, R. A.
AU  - Pandey, A.
AU  - Pohl, M.
AU  - Pueschel, E.
AU  - Quinn, J.
AU  - Rabinowitz, P. L.
AU  - Ragan, K.
AU  - Reynolds, P. T.
AU  - Ribeiro, D.
AU  - Roache, E.
AU  - Rulten, C.
AU  - Sadeh, I.
AU  - Saha, L.
AU  - Santander, M.
AU  - Sembroski, G. H.
AU  - Shang, R.
AU  - Tak, D.
AU  - Talluri, A. K.
AU  - Tucci, J. V.
AU  - Valverde, J.
AU  - Vassiliev, V. V.
AU  - Williams, D. A.
AU  - Wong, S. L.
AU  - Woo, J.
AU  - Yoshikoshi, T.
AU  - Meyer, M.
TI  - Constraints on axionlike particles from VERITAS observations of a flaring radio galaxy in the Perseus cluster
IS  - arXiv:2510.19010
M1  - PUBDB-2026-00213
M1  - arXiv:2510.19010
PY  - 2025
N1  - 18 pages, 6 figures, accepted for publication in the Physical Review D (PRD)
AB  - Axion-like particles (ALPs) are hypothetical particles that emerge in numerous theoretical extensions to the Standard Model. Their coupling to electromagnetic field implies that ALPs would mix with photons in the presence of external magnetic fields. As ALP phenomenology is governed by the mass and strength of its coupling, there is a subset of this parameter space in which this mixing would be expected to leave an imprint on the spectra of TeV γ-ray sources. In 2017, the VERITAS γ-ray observatory recorded the second day of a dramatic flare of the radio galaxy NGC 1275, embedded at the center of the Perseus galaxy cluster. This serendipitous locale provides a spatially-extended magnetic field of strength O(10 μG) through which escaping photons traverse, making it an excellent target to study ALPs. We analyze the VERITAS data of NGC 1275’s 2017 flare with the gammapy analysis package. Extensive fitting and modeling are performed to ultimately conduct a likelihood analysis used to search for any evidence of a preference for ALPs and to explore the confidence with which constraints can be set. We adopt the CLs method for this study for its conservative approach to setting limits in regimes where the search has limited sensitivity. No evidence for the existence of ALPs is found, and no combination of mass and coupling strength can be excluded at or above 95
LB  - PUB:(DE-HGF)25
DO  - DOI:10.3204/PUBDB-2026-00213
UR  - https://bib-pubdb1.desy.de/record/643452
ER  -