Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission

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Volume 695 (March 2025)

A&A, 695 (2025) A152

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Table E.1.

Model-fit results of the lepto-hadronic modelling for observation days t − t₀ ∼ 1 d, 2 d and 4 d.

Parameter	Best-fit value on observation day

	Day 1	Day 2	Day 4
Lepo-hadronic model

Slope, Γ	$- 2 . 25_{- 0.17}^{+ 0.17}$ $-2.25^{+0.17}_{-0.17}$	$- 1 . 4_{- 0.6}^{+ 0.2}$ $-1.4^{+0.2}_{-0.6}$	$- 2 . 49_{- 0.06}^{+ 0.05}$ $-2.49^{+0.05}_{-0.06}$
E_c, e [GeV]	$1 . 1_{- 0.6}^{+ 0.6}$ $1.1^{+0.6}_{-0.6}$	$26_{- 5}^{+ 6}$ $26^{+6}_{-5}$	$290_{- 80}^{+ 90}$ $290^{+90}_{-80}$
E_c, p [TeV]	$0 . 26_{- 0.14}^{+ 0.14}$ $0.26^{+0.14}_{-0.14}$	$1 . 1_{- 0.2}^{+ 0.3}$ $1.1^{+0.3}_{-0.2}$	$1 . 8_{- 0.5}^{+ 0.5}$ $1.8^{+0.5}_{-0.5}$
L_p/L_e [%]	$940_{- 660}^{+ 2480}$ $940^{+2480}_{-660}$	$64_{- 7}^{+ 20}$ $64^{+20}_{-7}$	$270_{- 270}^{+ 1500}$ $270^{+1500}_{-270}$
χ²/N_d.o.f	21.2/14	23.1/21	26.9/15
χ_red²	1.51	1.10	1.79
AIC_c	32.1	33.1	37.8

Notes. Γ is the best-fit slope for the electron and proton energy distributions. The best-fit cutoff energy of protons and electrons is E_c, p and E_c, e, respectively. We note that the cutoff energies of protons and electrons are in TeV and GeV, respectively. Both spectral energy distributions are related using the proton-to-electron luminosity ratio, L_p/L_e. We provide the χ_red² fit statistics (χ_red² = χ²/N_d.o.f) and the daily AIC_c values. The sum of the AIC_c values for all days for the lepto-hadronic model is 102.9.

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