The gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447 - I. The X-ray View

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Table 7

Overview of X-ray spectral properties of γ-ray emitting and radio-loud NLS1 galaxies.

Source	Redshift	Model	Γ_soft ^a	Γ_hard ^b	E _B ^c	F _X ^d	Variability^e	Ref.

1H 0323+342	0.061	simple power law	−	2.02 ± 0.06	−	14.0 ± 0.1	F/S	(1)
PKS 1502+036	0.409	simple power law	−	1.7 ± 0.2	−	0.3 ± 0.7	F/(S)	(2)
PKS 2004−447	0.240	simple power law	−	1.58 ± 0.11	−	0.7 ± 0.4	F/S	this paper
PMN J0948+0022	0.585	broken power law					F/(S)	(3)
SBS 0846+513	0.584	simple power law	−	1.47 ± 0.25	−	0.8 ± 0.4	F	(4)

Notes. Overview of spectral parameters of known γ-ray and radio-loud NLS1 galaxies for the simplest best-fit models in the literature.

^(a)

Photon Index, in the case of PMN J0948+0022 γ₁ represents the photon index before the break energy.

^(b)

Photon Index after the break energy of the broken power law.

^(c)

Break energy in units of keV of the broken power law.

^(d)

X-ray flux in units of 10^-12 erg s^-1cm^-2 in the range of (0.3–10) keV in case of PMN J0948+0022, PKS 1502+036, and SBS 0846+513, and (0.2–10) keV for 1H 0323+342.

^(e)

Variability of the X-ray spectrum. Flux variability is denoted as F, spectral variability as S. Indications of variability that has not been confirmed are shown in parenthesis.

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