A broadband X-ray view of the ultraluminous sources in the galaxies ESO 501–023 and IC 5052

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Volume 693 (January 2025)

A&A, 693 (2025) A122

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Table 1.

Best-fit parameters and uncertainties for the ULXs ESO 501-023 and IC 5052 X-1.

		ESO 501–023 ULX		IC 5052 X-1

Component	Parameter	SIMPL	CUTOFFPL	SIMPL	CUTOFFPL
CONS	𝒞_MOS1	1.02 ± 0.02	1.02 ± 0.02	1.01 ± 0.04	1.00 ± 0.04
	𝒞_MOS2	1.02 ± 0.02	1.01 ± 0.02	1.02 ± 0.04	1.02 ± 0.04
	𝒞_FPMA	0.99 ± 0.06	0.99 ± 0.05	$0 . 88_{- 0.06}^{+ 0.07}$ $0.88_{-0.06}^{+0.07}$	0.86 ± 0.06
	𝒞_FPMB	$0 . 96_{- 0.07}^{+ 0.06}$ $0.96^{+0.06}_{-0.07}$	0.96 ± 0.07	0.87 ± 0.07	$0 . 85_{- 0.06}^{+ 0.07}$ $0.85^{+0.07}_{-0.06}$
TBABS	N_H (10²² cm⁻²)	0.07 ± 0.02	0.07 ± 0.02	0.64 ± 0.09	0.7 ± 0.1
DISKBB	kT_in (keV)	0.32 ± 0.03	$0 . 32_{- 0.04}^{+ 0.03}$ $0.32^{+0.03}_{-0.04}$	$0 . 30_{- 0.04}^{+ 0.05}$ $0.30^{+0.05}_{-0.04}$	$0 . 25_{- 0.04}^{+ 0.06}$ $0.25^{+0.06}_{-0.04}$
	norm	$2 . 0_{- 0.7}^{+ 1.0}$ $2.0^{+1.0}_{-0.7}$	$2 . 0_{- 0.7}^{+ 1.0}$ $2.0^{+1.0}_{-0.7}$	$5_{- 3}^{+ 8}$ $5^{+8}_{-3}$	$10_{- 9}^{+ 40}$ $10^{+40}_{-9}$
CUTOFFPL	Γ	–	0.59^( † )	–	0.59^( † )
	E_fold (keV)	–	7.1^( † )	–	7.1^( † )
	norm	–	7 ± 3 × 10⁻⁶	–	$3 . 9_{- 0.5}^{+ 0.4} \times 10^{- 5}$ $3.9^{+0.4}_{-0.5}\times10^{-5}$
SIMPL	Γ	$4 . 0_{- 2.0}^{+ 0.7}$ $4.0^{+0.7}_{-2.0}$	–	$2 . 1_{- 0.2}^{+ 0.3}$ $2.1^{+0.3}_{-0.2}$	–
	cf	$0 . 4_{- 0.3}^{+ 0.5}$ $0.4^{+0.5}_{-0.3}$	–	$0 . 8_{- 0.3}^{+ 0.1}$ $0.8^{+0.1}_{-0.3}$	–
DISKPBB	kT_in (keV)	1.1 ± 0.2	1.2 ± 0.1	$1 . 1_{- 0.4}^{+ 0.6}$ $1.1^{+0.6}_{-0.4}$	$1 . 0_{- 0.2}^{+ 0.4}$ $1.0^{+0.4}_{-0.2}$
	p	$0 . 9_{- 0.2}^{+ 0.1}$ $0.9^{+0.1}_{-0.2}$	$0 . 8_{- 0.2}^{+ 0.1}$ $0.8^{+0.1}_{-0.2}$	0.7 ± 0.2	0.7 ± 0.2
	norm	$0 . 05_{- 0.03}^{+ 0.04}$ $0.05^{+0.04}_{-0.03}$	0.03 ± 0.01	$0 . 02_{- 0.01}^{+ 0.07}$ $0.02^{+0.07}_{-0.01}$	$0 . 01_{- 0.01}^{+ 0.04}$ $0.01^{+0.04}_{-0.01}$
LUMINOSITY	10³⁹ erg s⁻¹	9.0 ± 0.4	$8 . 9_{- 0.3}^{+ 0.4}$ $8.9^{+0.4}_{-0.3}$	$5 . 2_{- 0.6}^{+ 1.4}$ $5.2^{+1.4}_{-0.6}$	$5 . 1_{- 0.6}^{+ 0.9}$ $5.1^{+0.9}_{-0.6}$

χ²/d.o.f.		422.2/416	423/417	347.7/356	344.1/357

Notes. The table shows 90% uncertainties from averaged spectral fits of XMM-Newton and NuSTAR data. Luminosities (0.3–20 keV) assume distances of ∼7 Mpc for ESO501 and ∼5.5 Mpc for IC5052. Parameters marked with ^( † ) were frozen during the fit.

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