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VERITAS Observations Contemporaneous with the LHAASO Detection of NGC 4278

  • Authors: A. Archer, P. Bangale, J. T. Bartkoske, W. Benbow, J. H. Buckley, Y. Chen, J. L. Christiansen, A. J. Chromey, A. Duerr, M. Errando, M. Escobar Godoy, S. Feldman, Q. Feng, S. Filbert, L. Fortson, A. Furniss, W. Hanlon, O. Hervet, C. E. Hinrichs, J. Holder, Z. Hughes, T. B. Humensky, M. Iskakova, W. Jin, M. N. Johnson, M. Kertzman, M. Kherlakian, D. Kieda, T. K. Kleiner, N. Korzoun, S. Kumar, S. Kundu, M. J. Lang, M. Lundy, G. Maier, C. McSorley, P. Moriarty, R. Mukherjee, W. Ning, S. O'Brien, M. Ohishi, R. A. Ong, A. Pandey, C. Poggemann, M. Pohl, E. Pueschel, J. Quinn, P. L. Rabinowitz, K. Ragan, P. T. Reynolds, D. Ribeiro, L. Rizk, E. Roache, I. Sadeh, L. Saha, H. Salzmann, M. Santander, G. H. Sembroski, R. Shang, M. Splettstoesser, D. Tak, A. K. Talluri, I. Thoreson, J. V. Tucci, J. Valverde, D. A. Williams, S. L. Wong, T. Yoshikoshi

A. Archer et al 2026 The Astrophysical Journal 1001 .

  • Provider: AAS Journals

Caption: Figure 2.

NGC 4278 SED during the active and quasi-quiet periods: LHAASO-WCDA fluxes and upper limits from LHAASO-KM2A (blue and purple), VERITAS (yellow and orange), and Fermi-LAT (green and light green). The E. Bronzini et al. (2024) Fermi-LAT (gray) is from data spanning the 1LHAASO Catalog dates. The power-law fit to the LHAASO data is from Z. Cao et al. (2024b). A log-parabolic model was fit to the combined dataset for the active period (blue dotted line), to explore the curvature of the spectrum. During the quasi-quiet period (purple dotted line), the two LHAASO-WCDA flux points do not constrain the curvature, so only the normalization was fit assuming the same spectral shape as the active period. The example corona model presented in Section 6.1 is also included.

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