A possible two-fold scenario for the disc-corona of the luminous active galactic nucleus 1H 0419-577: A high-density disc or a warm corona

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Volume 700 (August 2025)

A&A, 700 (2025) A81

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Table 4.

Simultaneous fits of the two 2018 XMM-Newton and NuSTAR spectra over the 0.3–79 keV range with the REFLKERRD relativistic reflection model corrected for Galactic absorption (see Sect. 3.3 for details).

Parameters
a	0.97 ± 0.02	0.90 ± 0.01
θ (degrees)	32.8 $_{- 3.8}^{+ 5.8}$ $^{+5.8}_{-3.8}$	41.1 ± 0.7
A_Fe	0.8 ± 0.1	1.6 ± 0.2
disc density (log)	15 (f)	18.1 ± 0.1

	2018 May

q₁	≥5.1	8.4 ± 0.2
q₂	2.8 ± 0.3	3.3 ± 0.7
R_br (R_g)	3.4 $_{- 1.1}^{+ 2.4}$ $^{+2.4}_{-1.1}$	6.0 ± 0.6
kT_h (keV)	80 $_{- 10}^{+ 11}$ $^{+11}_{-10}$	420 $_{- 7}^{+ 4}$ $^{+4}_{-7}$
τ_h	0.4 ± 0.1	≤0.05
log ξ ^(a)	0.2 $_{- 0.1}^{+ 0.2}$ $^{+0.2}_{-0.1}$	2.8 ± 0.1
ℛ	4.5 $_{- 0.9}^{+ 0.6}$ $^{+0.6}_{-0.9}$	0.23 ± 0.01
norm (×10⁻³)	3.6 ± 0.1	2.6 ± 0.1

$F_{0.3 - 79 keV}^{unabs}$ $F^{\mathrm{unabs}}_{\mathrm{0.3-79\,keV}}$ ^(c)	4.3 × 10⁻¹¹
$L_{0.3 - 79 keV}^{unabs}$ $L^{\mathrm{unabs}}_{\mathrm{0.3-79\,keV}}$ ^(d)	1.6 × 10⁴⁵

	2018 Nov.

q₁	≥5.8	≥9.8
q₂	3.4 $_{- 0.2}^{+ 0.3}$ $^{+0.3}_{-0.2}$	3.1 $_{- 0.3}^{+ 0.8}$ $^{+0.8}_{-0.3}$
R_br (R_g)	2.4 $_{- 0.2}^{+ 0.6}$ $^{+0.6}_{-0.2}$	5.1 $_{- 0.2}^{+ 11.9}$ $^{+11.9}_{-0.2}$
kT_h (keV)	81 ± 12	423 ± 4
τ_h	0.4 ± 0.1	≤0.05
log ξ ^(a)	0.2 $_{- 0.1}^{+ 0.2}$ $^{+0.2}_{-0.1}$	2.8 ± 0.1
ℛ	4.6 $_{- 0.8}^{+ 0.6}$ $^{+0.6}_{-0.8}$	0.25 ± 0.01
norm (×10⁻³)	4.1 ± 0.1	2.9 ± 0.1

$F_{0.3 - 79 keV}^{unabs}$ $F^{\mathrm{unabs}}_{\mathrm{0.3-79\,keV}}$ ^(c)	6.1 × 10⁻¹¹
$L_{0.3 - 79 keV}^{unabs}$ $L^{\mathrm{unabs}}_{\mathrm{0.3-79\,keV}}$ ^(d)	1.8 × 10⁴⁵

χ²/d.o.f.	1623.5/1436	1545.0/1437
$χ_{red}^{2}$ $\chi^{2}_{\mathrm{red}}$	1.13^(b)	1.08

Notes. ^(a)The ionisation parameter ξ is expressed in units of erg cm s⁻¹. ^(b)Though the reduced χ² value appears satisfactory, a prominent excess is observed on the data-to-model ratio above about 40 keV, as illustrated in Fig. 6 (top panel). ^(c)The 0.3–79 keV unabsorbed fluxes are expressed in units of erg cm⁻² s⁻¹. ^(d)The 0.3–79 keV unabsorbed luminosities are expressed in units of erg s⁻¹.

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