Far-infrared lines hidden in archival deep multi-wavelength surveys: Limits on [CII]-158 μm at z ∼ 0.3−2.9

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Volume 705 (January 2026)

A&A, 705 (2026) A246

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Table 3.

Estimated bias from contaminating spectral lines within the Herschel/SPIRE broad bandpass for each [CII]-158 μm redshift bin.

z_median	(z_min, z_max)	SPIRE band	Contaminating Interlopers within filter FWHM	$\frac{\sum_{inter} (L \tilde{T})}{L_{[CII]} {\tilde{T}}_{[CII]} + \sum_{inter} (L \tilde{T})}$ $\frac{\sum_{\mathrm{inter}}(L \tilde{T})}{L_{\mathrm{[CII]}} \tilde{T}_{\mathrm{[CII]}} + \sum_{\mathrm{inter}}(L \tilde{T})}$
.65	(.33, .86)	250 μm	[OI]-145 μm, [NII]-122 μm, ¹²CO(12–11),	6.8%
.65	(.33, .86)	250 μm	¹²CO(13-12), [NII]-205 μm	6.8%
1.3	(1.0, 1.6)	350 μm	[OI]-145 μm, [NII]-122 μm, ¹²CO(13-12)	6.5%
2.1	(1.6, 2.3)	500 μm	[OI]-145 μm, ¹²CO(12-11), ¹²CO(13-12), [NII]-205 μm	7.3%
2.6	(2.3, 2.9)	500 μm	[OI]-145 μm, [NII]-122 μm	11%

Notes. Estimates of line luminosity are taken from Visbal et al. (2011); we consider all lines in their Table 1. We identify interlopers redshifted within the FWHM of the SPIRE bands and report the aggregate potential positive bias. These biases are insignificant compared with our uncertainties.

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