Inflowing gas onto a compact obscured nucleus in Arp 299A - Herschel spectroscopic studies of H2O and OH

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Table 3

3σ upper limits to undetected HO and ¹⁸OH lines.

Line	λ_rest	Line peak^a	Flux^a^b	Predicted flux^c
	(μm)	(Jy)	(Jy km s^-1)	(Jy km s^-1)


HO 4₂₂ → 3₁₃	57.840	< 0.99	< 210	...
HO 5₂₄ → 4₁₃	71.754	< 1.20	< 210	...
HO 6₀₆ → 5₁₅	83.591	< 1.19	< 170	...
HO 3₁₃ → 2₀₂	139.586	< 1.32	< 370	...
HO 2₂₀ → 2₁₁	250.034	< 0.54	< 160	...
HO 4₂₂ → 4₁₃	252.167	< 0.51	< 150	...
HO 3₁₂ → 3₀₃	253.762	< 0.48	< 140	...
HO 3₂₁ → 3₁₂	263.738	< 0.51	< 160	...
¹⁸OH	65.543	< 1.59	< 310	−40
¹⁸OH	65.690	< 1.59	< 310	−40
¹⁸OH	71.679	< 1.05	< 190	−10
¹⁸OH	84.947	< 1.62	< 230	−230
¹⁸OH	85.123	< 1.62	< 230	−230
¹⁸OH	120.171 ^d	< 1.23	< 380	−330
¹⁸OH	164.269	< 0.90	< 220	30
¹⁸OH	164.545	< 0.90	< 220	30

Notes.

^(a)

Upper limits are to the absolute values.

^(b)

Upper limits to the fluxes were calculated using the instrument resolution and assuming a Gaussian profile for lines observed with PACS and a sinc profile for lines observed with SPIRE.

^(c)

Predicted flux, for the ¹⁸OH lines, from the inner component using the limiting value N_OH/τ₅₀ = 5 × 10¹⁵, corresponding to a lower limit on the ¹⁶O/¹⁸O ratio of 400.

^(d)

The blue component of the ¹⁸OH doublet at 120μm is close to the CH⁺3−2 absorption line and we only estimate an upper limit for the red component.

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