%0 Generic %1 s2023constraints %A S., H. E. S. %A Collaborations, Fermi-LAT %A :, %A Aharonian, F. %A Aschersleben, J. %A Backes, M. %A Martins, V. Barbosa %A Batzofin, R. %A Becherini, Y. %A Berge, D. %A Bi, B. %A Bouyahiaoui, M. %A Breuhaus, M. %A Brose, R. %A Brun, F. %A Bruno, B. %A Bulik, T. %A Burger-Scheidlin, C. %A Bylund, T. %A Caroff, S. %A Casanova, S. %A Celic, J. %A Cerruti, M. %A Chand, T. %A Chandra, S. %A Chen, A. %A Chibueze, J. %A Chibueze, O. %A Cotter, G. %A de Bony, M. %A Egberts, K. %A Ernenwein, J. P. %A de Clairfontaine, G. Fichet %A Filipovic, M. %A Fontaine, G. %A Füßling, M. %A Funk, S. %A Gabici, S. %A Ghafourizadeh, S. %A Giavitto, G. %A Glawion, D. %A Glicenstein, J. F. %A Goswami, P. %A Grondin, M. H. %A Haerer, L. %A Holch, T. L. %A Holler, M. %A Horns, D. %A Jamrozy, M. %A Jankowsky, F. %A Joshi, V. %A Jung-Richardt, I. %A Kasai, E. %A Katarzynński, K. %A Khatoon, R. %A Khélifi, B. %A Kluźniak, W. %A Komin, Nu. %A Kosack, K. %A Kostunin, D. %A Lang, R. G. %A Stum, S. Le %A Leitl, F. %A Lemière, A. %A Lenain, J. P. %A Leuschner, F. %A Lohse, T. %A Luashvili, A. %A Lypova, I. %A Mackey, J. %A Malyshev, D. %A Malyshev, D. %A Marandon, V. %A Marchegiani, P. %A Marcowith, A. %A Martí-Devesa, G. %A Marx, R. %A Meyer, M. %A Mitchell, A. %A Moderski, R. %A Mohrmann, L. %A Montanari, A. %A Moulin, E. %A Muller, J. %A Murach, T. %A Nakashima, K. %A Niemiec, J. %A Ohm, S. %A Olivera-Nieto, L. %A Wilhelmi, E. de Ona %A Panny, S. %A Panter, M. %A Parsons, R. D. %A Peron, G. %A Prokhorov, D. A. %A Prokoph, H. %A Pühlhofer, G. %A Punch, M. %A Quirrenbach, A. %A Reichherzer, P. %A Reimer, A. %A Reimer, O. %A Reville, B. %A Rieger, F. %A Rowell, G. %A Rudak, B. %A Ruiz-Velasco, E. %A Sahakian, V. %A Sanchez, D. A. %A Sasaki, M. %A Schüussler, F. %A Schutte, H. M. %A Schwanke, U. %A Shapopi, J. N. S. %A Sol, H. %A Spencer, S. %A Steinmassl, S. %A Suzuki, H. %A Takahashi, T. %A Tanaka, T. %A Taylor, A. M. %A Terrier, R. %A Thorpe-Morgan, C. %A Tsirou, M. %A Tsuji, N. %A Uchiyama, Y. %A van Eldik, C. %A Veh, J. %A Venter, C. %A Wagner, S. J. %A White, R. %A Wierzcholska, A. %A Wong, Yu Wun %A Zacharias, M. %A Zargaryan, D. %A Zdziarski, A. A. %A Zouari, S. %A Zywucka, N. %D 2023 %K astrophysics hep-ph magnetic_fields %R 10.3847/2041-8213/acd777 %T Constraints on the intergalactic magnetic field using Fermi-LAT and H.E.S.S. blazar observations %U http://arxiv.org/abs/2306.05132 %X Magnetic fields in galaxies and galaxy clusters are believed to be the result of the amplification of intergalactic seed fields during the formation of large-scale structures in the universe. However, the origin, strength, and morphology of this intergalactic magnetic field (IGMF) remain unknown. Lower limits on (or indirect detection of) the IGMF can be obtained from observations of high-energy gamma rays from distant blazars. Gamma rays interact with the extragalactic background light to produce electron-positron pairs, which can subsequently initiate electromagnetic cascades. The $\gamma$-ray signature of the cascade depends on the IGMF since it deflects the pairs. Here we report on a new search for this cascade emission using a combined data set from the Fermi Large Area Telescope and the High Energy Stereoscopic System. Using state-of-the-art Monte Carlo predictions for the cascade signal, our results place a lower limit on the IGMF of $B > 7.1\times10^-16$ G for a coherence length of 1 Mpc even when blazar duty cycles as short as 10 yr are assumed. This improves on previous lower limits by a factor of 2. For longer duty cycles of $10^4$ ($10^7$) yr, IGMF strengths below $1.8\times10^-14$ G ($3.9\times10^-14$ G) are excluded, which rules out specific models for IGMF generation in the early universe.

@misc{s2023constraints, abstract = {Magnetic fields in galaxies and galaxy clusters are believed to be the result of the amplification of intergalactic seed fields during the formation of large-scale structures in the universe. However, the origin, strength, and morphology of this intergalactic magnetic field (IGMF) remain unknown. Lower limits on (or indirect detection of) the IGMF can be obtained from observations of high-energy gamma rays from distant blazars. Gamma rays interact with the extragalactic background light to produce electron-positron pairs, which can subsequently initiate electromagnetic cascades. The $\gamma$-ray signature of the cascade depends on the IGMF since it deflects the pairs. Here we report on a new search for this cascade emission using a combined data set from the Fermi Large Area Telescope and the High Energy Stereoscopic System. Using state-of-the-art Monte Carlo predictions for the cascade signal, our results place a lower limit on the IGMF of $B > 7.1\times10^{-16}$ G for a coherence length of 1 Mpc even when blazar duty cycles as short as 10 yr are assumed. This improves on previous lower limits by a factor of 2. For longer duty cycles of $10^4$ ($10^7$) yr, IGMF strengths below $1.8\times10^{-14}$ G ($3.9\times10^{-14}$ G) are excluded, which rules out specific models for IGMF generation in the early universe.}, added-at = {2023-07-27T09:07:56.000+0200}, author = {S., H. E. S. and Collaborations, Fermi-LAT and : and Aharonian, F. and Aschersleben, J. and Backes, M. and Martins, V. Barbosa and Batzofin, R. and Becherini, Y. and Berge, D. and Bi, B. and Bouyahiaoui, M. and Breuhaus, M. and Brose, R. and Brun, F. and Bruno, B. and Bulik, T. and Burger-Scheidlin, C. and Bylund, T. and Caroff, S. and Casanova, S. and Celic, J. and Cerruti, M. and Chand, T. and Chandra, S. and Chen, A. and Chibueze, J. and Chibueze, O. and Cotter, G. and de Bony, M. and Egberts, K. and Ernenwein, J. P. and de Clairfontaine, G. Fichet and Filipovic, M. and Fontaine, G. and Füßling, M. and Funk, S. and Gabici, S. and Ghafourizadeh, S. and Giavitto, G. and Glawion, D. and Glicenstein, J. F. and Goswami, P. and Grondin, M. H. and Haerer, L. and Holch, T. L. and Holler, M. and Horns, D. and Jamrozy, M. and Jankowsky, F. and Joshi, V. and Jung-Richardt, I. and Kasai, E. and Katarzynński, K. and Khatoon, R. and Khélifi, B. and Kluźniak, W. and Komin, Nu. and Kosack, K. and Kostunin, D. and Lang, R. G. and Stum, S. Le and Leitl, F. and Lemière, A. and Lenain, J. P. and Leuschner, F. and Lohse, T. and Luashvili, A. and Lypova, I. and Mackey, J. and Malyshev, D. and Malyshev, D. and Marandon, V. and Marchegiani, P. and Marcowith, A. and Martí-Devesa, G. and Marx, R. and Meyer, M. and Mitchell, A. and Moderski, R. and Mohrmann, L. and Montanari, A. and Moulin, E. and Muller, J. and Murach, T. and Nakashima, K. and Niemiec, J. and Ohm, S. and Olivera-Nieto, L. and Wilhelmi, E. de Ona and Panny, S. and Panter, M. and Parsons, R. D. and Peron, G. and Prokhorov, D. A. and Prokoph, H. and Pühlhofer, G. and Punch, M. and Quirrenbach, A. and Reichherzer, P. and Reimer, A. and Reimer, O. and Reville, B. and Rieger, F. and Rowell, G. and Rudak, B. and Ruiz-Velasco, E. and Sahakian, V. and Sanchez, D. A. and Sasaki, M. and Schüussler, F. and Schutte, H. M. and Schwanke, U. and Shapopi, J. N. S. and Sol, H. and Spencer, S. and Steinmassl, S. and Suzuki, H. and Takahashi, T. and Tanaka, T. and Taylor, A. M. and Terrier, R. and Thorpe-Morgan, C. and Tsirou, M. and Tsuji, N. and Uchiyama, Y. and van Eldik, C. and Veh, J. and Venter, C. and Wagner, S. J. and White, R. and Wierzcholska, A. and Wong, Yu Wun and Zacharias, M. and Zargaryan, D. and Zdziarski, A. A. and Zouari, S. and Zywucka, N.}, biburl = {https://www.bibsonomy.org/bibtex/2e2a82bfe65f577424f5ca401b1d9deb1/intfxdx}, description = {Constraints on the intergalactic magnetic field using Fermi-LAT and H.E.S.S. blazar observations}, doi = {10.3847/2041-8213/acd777}, interhash = {e46feb331091271ec06f36bc59d15dfe}, intrahash = {e2a82bfe65f577424f5ca401b1d9deb1}, keywords = {astrophysics hep-ph magnetic_fields}, note = {cite arxiv:2306.05132Comment: 20 pages, 7 figures, 4 tables. Accepted for publication in ApJ Letters. Auxiliary data is provided in electronic format at https://zenodo.org/record/8014311}, timestamp = {2023-07-27T09:07:56.000+0200}, title = {Constraints on the intergalactic magnetic field using Fermi-LAT and H.E.S.S. blazar observations}, url = {http://arxiv.org/abs/2306.05132}, year = 2023 }