Detection of the [C I] λ8727 emission line - Low-ionization structures in NGC 7009

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Volume 689 (September 2024)

A&A, 689 (2024) A14

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Table 3

Optical emission line fluxes from specific pseudo-slits or nebular regions^(a).

Ion	I_F	$I_{S_{F}}$ ${{\rm{I}}_{{S_F}}}$	$I_{S_{F}}$ ${{\rm{I}}_{{S_F}}}$	$I_{S_{k 2}}$ ${{\rm{I}}_{{S_{k2}}}}$	$I_{S_{k 4}}$ ${{\rm{I}}_{{S_{k4}}}}$
He II 4686 Å	5.44	17.45	0.692	9.78	0.652
H I 4861 Å	100	100	100	100	100
[O III] 4959 Å	388	391	398	399	449
[N I] 5199 Å	0.09	0.087	3.577	0.104	4.135
He II 5412 Å	1.32	1.345	0.196	0.758	0.292
[N II] 5755 Å	0.395	0.408	4.388	0.582	5.143
He I 5876 Å	14.42	15.35	15.72	16.09	14.96
[O I] 6300 Å	0.559	0.544	21.7	0.746	19.72
H I 6563 Å	266	288	289	288	289
[N II] 6584 Å	15.64	18.10	253	33.1	307
He I 6678 Å	3.68	4.12	4.352	4.393	4.105
[S II] 6717 Å	1.377	1.71	26.40	3.415	34.77
[S II] 6731 Å	2.284	2.89	37.06	5.777	43.27
[C I] 8727 Å	–	0.011	0.172	0.012	0.170
[Fe III] 8729 Å	0.018	0.005	0.039	0.004	0.041
He I 8733 Å	0.075	0.024	0.046	0.025	0.069

F(Hβ)(10⁻¹³)	–	208	1.25	35.8	0.65
${\frac{[C I] λ 8727}{H α}}^{(†)}$ ${{{\left[ {{\rm{C}}\,\,{\rm{I}}} \right]\,\,\lambda 8727} \over {{\rm{H}}\,\alpha }}^{\left( \dag \right)}}$	(6.77)^(††)	3.8	59.5	4.2	58.8

Notes. ^(a)I is the intensity of the lines on the scale Hβ = 100. The indices S and F refer to the results obtained with SATELLITE (Akras et al. 2022b) and (Fang & Liu 2011). The labels k1, k2, and k4 correspond to the nomenclature given in Gonçalves et al. (2004a). ^(†)(10⁻⁵). ^(††)Assuming that [Fe III] 8729 Å corresponds to [C I] 8727 Å.

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