The Sunburst Arc with JWST - II. Observations of an Eta Carinae analog at z = 2.37

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Volume 698 (June 2025)

A&A, 698 (2025) A16

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Table 2.

Flux ratio compared to candidate counterimages and the derived magnification factor.

	f/f_4.4 (Continuum)	f/f_4.4 (O I 8449Å)	μ (P21)	μ (S22)
Godzilla	7.6 ± 0.38	35 ± 5.1	$570_{- 100}^{+ 100}$ $570^{+100}_{-100}$	$550_{- 120}^{+ 92}$ $550^{+92}_{-120}$
P1	1.2 ± 0.077	1.2 ± 0.20	$20_{- 3.9}^{+ 3.8}$ $20^{+3.8}_{-3.9}$	$19_{- 4.5}^{+ 3.5}$ $19^{+3.5}_{-4.5}$
P2	1.7 ± 0.099	1.6 ± 0.25	$26_{- 5.0}^{+ 4.9}$ $26^{+4.9}_{-5.0}$	$25_{- 5.9}^{+ 4.4}$ $25^{+4.4}_{-5.9}$

	f/f_4.9 (Continuum)	f/f_4.9 (O I 8449Å)	μ (P21)	μ (S22)

Godzilla	9.5 ± 0.55	94 ± 22	$6700_{- 1700}^{+ 1700}$ $6700^{+1700}_{-1700}$	$2900_{- 740}^{+ 1100}$ $2900^{+1100}_{-740}$
P1	1.5 ± 0.10	3.3 ± 0.8	$230_{- 60}^{+ 61}$ $230^{+61}_{-60}$	$100_{- 26}^{+ 40}$ $100^{+40}_{-26}$
P2	2.1 ± 0.14	4.3 ± 1.0	$310_{- 78}^{+ 80}$ $310^{+80}_{-78}$	$130_{- 34}^{+ 50}$ $130^{+50}_{-34}$

Notes. Top row shows the comparison with image 4.4, and the bottom row shows the comparison with image 4.9. The continuum flux is calculated as the average of the flux ratios from 6 NIRCam filters (F115W, F150W, F200W, F277W, F356W, F444W), weighted with the inverse square of the error. The O I flux was calculated from each clump’s 1D spectrum. The magnification factor was determined by comparing the values for images 4.4 and 4.9 given in Pignataro et al. (2021) and Sharon et al. (2022), denoted as P21 and S22, respectively.

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