The dependency of AGN infrared colour-selection on source luminosity and obscuration - An observational perspective in CDFS and COSMOS

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Table 1

Sample.

Field	N _AGN	Obscuration^a		Luminosity^b
		A ₁	A ₂	A _H	A _L

[K_s + IRAC]
CDFS	218	44	129	69	149
COSMOS	1423	543	515	961	457

[K_s + IRAC + MIPS_24 μm]
CDFS	171	35	106	61	110
COSMOS	842	381	322	600	238

Notes. While reliable photometry is required in the upper group of rows – a magnitude error below 0.36 – in K+IRAC bands, in the lower group of rows we also require reliable 24 μm photometry.

^(a)

The sample is separated into unobscured (A₁, log (N_H [cm^-2] ) ≤ 22 or spectroscopy information) and obscured (A₂, log (N_H [cm^-2] ) > 22 or spectroscopy information) AGN.

^(b)

The sample is separated into high-luminosity (A_H, log (L_XR [erg s^-1] ) ≥ 43.5) and low-luminosity (A_L, log (L_XR [erg s^-1] ) < 43.5) AGN.

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