No evidence of active galactic nucleus features in the nuclei of Arp 220 from JWST/NIRSpec IFS

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Volume 690 (October 2024)

A&A, 690 (2024) A171

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Table 3.

High-ionisation lines.

Line	λ_vac	IP	Ref	log L_line
	(μm)	(eV)		(erg s⁻¹)
(1)	(2)	(3)	(4)	(5)
[S VIII]	0.9916	281	L17, C21	< 37.0
Cr VIII	1.0109	160		< 36.9
[Fe XIII]	1.0750	331	L17, C21	< 37.0
[Fe XIII]	1.0801	331	L17, C21	< 37.0
[S IX]	1.2523	329	B23, C21	< 36.9
[Si X]	1.4305	351	C21	–
[Ti VI]	1.7156	99		< 37.3
[S XI]	1.9201	448	L17, C21	< 37.1
[Si XI]	1.9327	401	L17, C21	< 37.1
[Si VI]	1.9646	167	L17, C21, B23	< 37.1
[Al IX]	2.0450	285	C21	< 37.1
Sc V	2.3118	73		< 37.0
[Ca VIII]	2.3211	127	C21,R06	< 37.0
[Si VII]	2.4810	205	B23	< 37.0
[Si IX]	2.5850	303	S02, L00	< 37.1
Al V	2.9050	120		< 37.0
[Mg VIII]	3.0280	225	S02,B23, L00	< 37.0
[Ca IV]	3.2070	51	L00	< 36.7
[Al VI]	3.6603	154		< 36.9
[Al VIII]	3.6900	242		< 36.9
[Si IX]	3.9290	303	S02, L00	< 37.0
[Ca V]	4.1585	67		< 37.0
[Mg IV]	4.4880	80	S02, B23, L00	38.03 ± 0.01 (W)
				37.72 ± 0.02 (E)
[Ar VI]	4.5292	75	B23, L00	< 37.0

Notes. Papers reporting the detection of high-ionisation lines: Sturm et al. (2002, S02), Lamperti et al. (2017, L17), Bianchin et al. (2024, B23), Cerqueira-Campos et al. (2021, C21), Lutz et al. (2000, L00). [Mg IV] luminosities are reported for both E and W nuclei; for all other high-ionisation lines, we report 3σ upper limits for the luminosities, assuming FWHM = 250 km s⁻¹. [Si X] is not covered by NIRSpec observations (it falls in detector gap).

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