Multiwavelength study of extreme variability in LEDA 1154204: A changing-look event in a type 1.9 Seyfert

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Volume 702 (October 2025)

A&A, 702 (2025) A28

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Table 4.

Parameters from broad SED fits assuming a black hole mass of 4 × 10⁸ M_⊙.

Date (MJD)	Telescope	log λ_Edd	Γ_warm	R_hot (R_g)	R_warm (R_g)	χ²/d.o.f.
58886	Swift	−2.13 ± 0.04	$2 . 35_{- 0.10}^{+ 0.12}$ $2.35^{+0.12}_{-0.10}$	23.0 ± 3.0	$300_{- 110}^{+ 170}$ $300^{+170}_{-110}$	1.22
58895	Swift	−2.16 ± 0.05	$2 . 32_{- 0.11}^{+ 0.16}$ $2.32^{+0.16}_{-0.11}$	$24 . 3_{- 4.1}^{+ 4.7}$ $24.3^{+4.7}_{-4.1}$	$250_{- 100}^{+ 210}$ $250^{+210}_{-100}$	0.87
58899	Swift	$- 2 . 23_{- 0.09}^{+ 0.11}$ $-2.23^{+0.11}_{-0.09}$	$2 . 43_{- 0.26}^{+ 0.34}$ $2.43^{+0.34}_{-0.26}$	$22 . 2_{- 7.4}^{+ 6.1}$ $22.2^{+6.1}_{-7.4}$	295 ± 180	1.06
58901	Swift	−2.17 ± 0.04	$2 . 40_{- 0.10}^{+ 0.16}$ $2.40^{+0.16}_{-0.10}$	28.1 ± 4.0	300 ± 180	1.34
58907	Swift	$- 2 . 29_{- 0.05}^{+ 0.08}$ $-2.29^{+0.08}_{-0.05}$	$2 . 60_{- 0.27}^{+ 0.29}$ $2.60^{+0.29}_{-0.27}$	$27 . 6_{- 6.1}^{+ 4.5}$ $27.6^{+4.5}_{-6.1}$	$209_{- 102}^{+ 256}$ $209^{+256}_{-102}$	0.79
58912	Swift	−2.26 ± 0.05	$2 . 45_{- 0.16}^{+ 0.21}$ $2.45^{+0.21}_{-0.16}$	$28 . 6_{- 6.4}^{+ 7.8}$ $28.6^{+7.8}_{-6.4}$	$255_{- 114}^{+ 215}$ $255^{+215}_{-114}$	1.25
58914	Swift	$- 2 . 22_{- 0.05}^{+ 0.06}$ $-2.22^{+0.06}_{-0.05}$	$2 . 44_{- 0.21}^{+ 0.23}$ $2.44^{+0.23}_{-0.21}$	$33 . 7_{- 8.9}^{+ 7.5}$ $33.7^{+7.5}_{-8.9}$	$234_{- 104}^{+ 230}$ $234^{+230}_{-104}$	0.77
58916	Swift	$- 2 . 40_{- 0.06}^{+ 0.10}$ $-2.40^{+0.10}_{-0.06}$	$2 . 75_{- 0.36}^{+ 0.33}$ $2.75^{+0.33}_{-0.36}$	$25 . 2_{- 6.3}^{+ 4.9}$ $25.2^{+4.9}_{-6.3}$	$186_{- 100}^{+ 280}$ $186^{+280}_{-100}$	0.96
58919	Swift	$- 2 . 61_{- 0.07}^{+ 0.13}$ $-2.61^{+0.13}_{-0.07}$	$2 . 97_{- 0.53}^{+ 0.46}$ $2.97^{+0.46}_{-0.53}$	17.7 ± 4.5	$134_{- 70}^{+ 302}$ $134^{+302}_{-70}$	1.76
59550	Swift	$- 2 . 45_{- 0.05}^{+ 0.04}$ $-2.45^{+0.04}_{-0.05}$	$2 . 40_{- 0.21}^{+ 0.44}$ $2.40^{+0.44}_{-0.21}$	$34 . 0_{- 6.1}^{+ 7.4}$ $34.0^{+7.4}_{-6.1}$	$82_{- 10}^{+ 16}$ $82^{+16}_{-10}$	1.55
59651	XMM-Newton	$- 2 . 98_{- 0.02}^{+ 0.04}$ $-2.98^{+0.04}_{-0.02}$	$2 . 98_{- 0.36}^{+ 0.67}$ $2.98^{+0.67}_{-0.36}$	30.0 ± 2.7	$149_{- 77}^{+ 264}$ $149^{+264}_{-77}$	1.05
59786	Swift	$- 2 . 87_{- 0.12}^{+ 0.07}$ $-2.87^{+0.07}_{-0.12}$	$2 . 39_{- 0.37}^{+ 1.71}$ $2.39^{+1.71}_{-0.37}$	$25 . 6_{- 5}^{+ 8}$ $25.6^{+8}_{-5}$	41 ± 9	6.18
60017	XMM-Newton	−2.99 ± 0.01	$2 . 20_{- 0.17}^{+ 1.16}$ $2.20^{+1.16}_{-0.17}$	$25 . 9_{- 1.26}^{+ 2.63}$ $25.9^{+2.63}_{-1.26}$	28.7 ± 3.0	4.46

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