High resolution IR observations of the starburst ring in NGC 7552 - One ring to rule them all?

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Table 1

Spectral properties and the measured flux densities in units of mJy through the nine used VISIR filters.

Filter	SIC	PAH1	ArIII	SIV_1	SIV	SIV_2	NeII_1	NeII	NeII_2


λ_c [μm]	11.85	8.59	8.99	9.82	10.49	10.77	12.27	12.80	13.03
Δλ [μm]	2.34	0.49	0.14	0.18	0.16	0.19	0.18	0.21	0.22


M1	116 ± 13	67 ± 10	80 ± 11	119 ± 14	72 ± 13	119 ± 14	184 ± 14	282 ± 18	200 ± 15
M2	90 ± 12	51 ± 9	41 ± 9	54 ± 12	22 ± 10	66 ± 12	111 ± 11	198 ± 15	132 ± 12
M3	41 ± 10	< 50	< 59	< 78	< 78	< 76	49 ± 9	111 ± 12	62 ± 9
M4	44 ± 10	< 50	< 59	< 78	< 78	< 76	47 ± 8	115 ± 13	53 ± 9
M5	< 61	< 50	< 59	< 78	< 78	< 76	< 44	54 ± 10	31 ± 7
M6	< 61	< 50	< 59	< 78	< 78	< 76	40 ± 8	63 ± 10	34 ± 8
M7	70 ± 11	83 ± 11	42 ± 9	< 78	< 78	< 76	90 ± 11	141 ± 14	110 ± 11
M8	< 61	< 50	< 59	< 78	< 78	< 76	28 ± 7	60 ± 10	38 ± 8
M9	41 ± 10	< 50	< 59	< 78	< 78	< 76	41 ± 8	78 ± 11	48 ± 8


ΣM_i	402 ± 66	201 ± 30	163 ± 29	173 ± 26	94 ± 23	185 ± 26	590 ± 76	1102 ± 113	708 ± 87
Ring	2023 ± 81	1336 ± 65	583 ± 59	1114 ± 79	^a	1262 ± 80	2326 ± 76	3700 ± 94	2435 ± 76


σ	37	30	27	47	47	46	27	35	27

Notes. In addition to the individual MIR peaks M1 through M9 we list their summed contribution (ΣM_i), the integrated fluxes within an annulus of 15 ≤ r ≤ 4′′, and the image background noise (σ in units of mJy arcsec^-2). Upper limits are defined as three times the image noise within a circle of 07 in diameter.

^(a)

It was not possible to perform aperture photometry because of insufficient signal-to-noise.

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