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 1.

Properties of the Arp 220 nuclear regions.

	W nucleus	E nucleus	NE cluster
RA (J2000)	15:34:57.224	15:34:57.294	15:34:57.309
Dec (J2000)	+23:30:11.515	+23:30:11.353	+23:30:11.698
Redshift (H I)	0.01774 ± 0.00001	0.01840 ± 0.00001	0.01870 ± 0.00001
Redshift (stars)	0.0179 ± 0.0003	0.0183 ± 0.0002	0.0186 ± 0.0001
SFR (radio/far-IR) [M_⊙ yr⁻¹]	110–150	60–80	–
SFR (Paα_corr) [M_⊙ yr⁻¹]	$0 . 52_{- 0.06}^{+ 0.16}$ $0.52_{-0.06}^{+0.16}$	0.17 ± 0.02	0.94 ± 0.02
SFR (PAH 3.3 μm) [M_⊙ yr⁻¹]	3.4 ± 0.2	1.5 ± 0.2	1.9 ± 0.2
A_V [mag]	$10 . 6_{- 0.5}^{+ 1.7}$ $10.6_{-0.5}^{+1.7}$	$14 . 1_{- 0.3}^{+ 0.6}$ $14.1_{-0.3}^{+0.6}$	11.2 ± 0.1
log (n_e/[cm⁻³]	3.7 ± 0.1	4.5 ± 0.4	3.6 ± 0.1

Notes. SFR measurements are corrected for dust extinction using the A_V reported in the table; the latter are obtained from Eq. (1), assuming R_V = 3.1. The radio and far-IR based SFR measurements were taken from Varenius et al. (2016) and Pereira-Santaella et al. (2021), respectively.

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