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 2.

Soft X-ray emission lines in the 1H 0419-577 rest-frame observed in the combined 2018 RGS spectrum.

Line ID	Energy (eV)	λ (Å)	EW (eV)	σ (eV)	Δχ² ^(a)
N VII Lyα (broad)	511 ± 7	24.26 ± 0.33	4.8 $_{- 1.8}^{+ 1.5}$ $^{+1.5}_{-1.8}$	(t)	−26.5
O VII (narrow)	560 ± 1	22.14 ± 0.04	1.1 $_{- 0.5}^{+ 0.4}$ $^{+0.4}_{-0.5}$	≤1.7	−15.1
O VII (broad)	576 ± 4	21.53 ± 0.15	10.6 $_{- 1.9}^{+ 2.8}$ $^{+2.8}_{-1.9}$	16.9 $_{- 3.9}^{+ 2.8}$ $^{+2.8}_{-3.9}$	−77.5
O VIII Lyα (broad)	663 $_{- 12}^{+ 13}$ $^{+13}_{-12}$	18.70 $_{- 0.36}^{+ 0.34}$ $^{+0.34}_{-0.36}$	4.2 $_{- 2.4}^{+ 2.2}$ $^{+2.2}_{-2.4}$	(t)	−2.4
Ne IX (broad)	908 ± 14	13.65 ± 0.21	6.9 $_{- 2.9}^{+ 2.5}$ $^{+2.5}_{-2.9}$	(t)	−16.4
Mg XI (broad)	1313 $_{- 37}^{+ 47}$ $^{+47}_{-37}$	9.45 $_{- 0.33}^{+ 0.27}$ $^{+0.27}_{-0.33}$	6.5 $_{- 4.6}^{+ 4.5}$ $^{+4.5}_{-4.6}$	(t)	−5.2

Notes. ^aImprovement in fit statistic upon successfully adding lines, listed from low to high energy. (t) means that the line width was linked to that of the broad O VII line in proportion to its energy to have the same velocity width in km s⁻¹.

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