Heavily obscured AGN detection: A radio versus X-ray challenge

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Table 1.

Summary of the area covered by radio and X-ray observations, flux limits, and observing time for each of the considered fields.

Field	Radio (1.4 GHz)			X-ray (0.5–2 keV)

	Area	Flux limit	T_OBS	Area	Flux limit	T_OBS
	[deg⁻²]	[μJy]	[h]	[deg⁻²]	10⁻¹⁶[erg s⁻¹ cm⁻²]	[h]
J1030	0.18	10.6	30	0.09	0.57	140
COSMOS	2.4	18	385	2.15	1	1278
LH-XMM	0.31	22	75	0.19	1.9	322
CDFS	0.32	16	40	0.13	0.08	1944
ECDFS	0.32	16	40	0.31	0.74	69
XMM-LSS	5	32	48	5.36	2.7	361
BOOTES	6.7	80	192	9.26	1.5	944
ELAIS-S1	2.7	83	410	3.2	4.7	278
CDFN	0.07	12	39	0.125	6	556
LHN	0.4	15	140	0.5	3.2	175

Notes. The X-ray and radio flux limits correspond to the flux of the faintest sources in the 0.5 − 2 keV X-ray catalogs and in the 1.4 GHz catalogs, respectively. We note that for the CDFS and ECDFS we considered the same radio survey. The fields are listed with the references for the radio observation followed by the X-ray one: J1030 (D’Amato et al. 2022; Nanni et al. 2020), COSMOS (Smolčić et al. 2017b; Civano et al. 2016), LH-XMM (Biggs & Ivison 2006; Brunner et al. 2008), ECDFS (Miller et al. 2013; Xue et al. 2016), CDFS (Miller et al. 2013; Liu et al. 2017), XMM-LSS (Heywood et al. 2020; Chen et al. 2018), BOOTES (de Vries et al. 2002; Masini et al. 2020), ELAIS-S1 (Franzen et al. 2015; Ni et al. 2021), CDFN (Owen 2018; Xue et al. 2016), LHN (Lockman-Hole North; Owen & Morrison 2008; Trouille et al. 2008).

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