Investigating the mysterious nature of 1LHAASO J1740+0948u through deep XMM-Newton observations

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Volume 704 (December 2025)

A&A, 704 (2025) A30

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Table 2

Best-fit results for the SED fitting of the LHAASO spectrum and the XMM-Newton upper limits on the diffuse emission when fixing the spectral index p.

^p	E_cut (TeV)	E_cut,γ (TeV)	We (erg)	Max log(L)	BIC
1.2	$156_{- 20}^{+ 15}$ $156^{+15}_{-20}$	33 ± 2	1.87 · 10⁴⁴	–3.46	11.53
1.4	$164_{- 18}^{+ 14}$ $164^{+14}_{-18}$	$35_{- 2}^{+ 1}$ $35^{+1}_{-2}$	2.29 · 10⁴⁴	–3.29	11.19
1.6	$163_{- 9}^{+ 28}$ $163^{+28}_{-9}$	${35.1}_{- 0.8}^{+ 3.6}$ $35.1^{+3.6}_{-0.8}$	3.29 · 10⁴⁴	–3.09	10.78
1.8	$196_{- 19}^{+ 26}$ $196^{+26}_{-19}$	$45_{- 9}^{+ 3}$ $45^{+3}_{-9}$	4.75 · 10⁴⁴	–2.93	10.46
2.0	$199_{- 29}^{+ 26}$ $199^{+26}_{-29}$	$46_{- 4}^{+ 3}$ $46^{+3}_{-4}$	1.20 · 10⁴⁵	–2.78	10.16
2.2	$231_{- 38}^{+ 30}$ $231^{+30}_{-38}$	$55_{- 5}^{+ 4}$ $55^{+4}_{-5}$	4.16 · 10⁴⁵	–2.68	9.96
2.4	$247_{- 24}^{+ 39}$ $247^{+39}_{-24}$	$60_{- 3}^{+ 5}$ $60^{+5}_{-3}$	2.24 · 10⁴⁶	–2.65	9.90

Notes. In addition to the best-fit values for the cut-off energy E_cut, its correspondent photon energy E_cut,γ and the total energy content W_e, we report the values of the maximum logarithmic likelihood and of the Bayesian information criterion (BIC) obtained with the naima fitting process.

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