Speaker
Description
The InterGalactic Magnetic Field (IGMF) is believed to be a remnant of the Big Bang and the origin of cosmological magnetic fields. However, it has yet to be detected. The Cherenkov Telescope Array Observatory (CTAO) will have the potential to place stricter constraints on the IGMF by analysing data from AGN and GRBs. In this study, we propose to simulate realistic observations in CTAO of GRBs detected so far in the TeV range, using the available instrument response functions of the Alpha configuration of CTAO: $4$ Large-Sized Telescopes (LSTs), $9$ Medium-Sized Telescopes (MSTs) in the CTAO-North array, and $14$ MSTs, $37$ Small-Sized Telescopes (SSTs) in the CTAO-South array. The expected IGMF signatures are modelled with a dedicated simulation code and the analysis of the synthetic data is performed using a joint, spectral and temporal fit. By assuming a power-law behaviour in energy with an unknown cut-off, we will extrapolate the detected GRBs into the tens of TeV energy range, we show that CTAO can constrain the IGMF in the range $\left[10^{-19},10^{-15}\right]\mathrm{G}$ for various coherence lengths and place limits on fields stronger than $10^{-15}\;\mathrm{G}$.
| Collaboration(s) | CTAO |
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