Table 1: ROSAT NEP properties of the three QSO 2 candidates.
Source Name NEP id # PSPC $F_{0.5{-}2.0~\rm keV} \pm \Delta F$ z (UH or MMT) z (TNG) $N_{\rm H}$ $L_{0.5{-}2.0~\rm keV}$ $M_{\rm B}$

10^-13 erg cm ^-2 s^-1 cm^-2 10⁴⁴ erg s^-1 (from USNO B mag)

RX J1715.4+6239 NEP 1239 1.39 $\pm$ 0.30 0.8500 0.8500 $2.62\times 10^{20}$ 4.88 -23.5

RX J1724.9+6636 NEP 1640 1.03 $\pm$ 0.25 0.6792 0.6758 $3.84\times 10^{20}$ 2.08 -23.2

RX J1737.0+6601 NEP 2131 1.36 $\pm$ 0.20 0.3580 0.3585 $3.76\times 10^{20}$ 0.60 -24.1

**Table 1:** *ROSAT* NEP properties of the three QSO 2 candidates.
Source Name	NEP id #	PSPC $F_{0.5{-}2.0~\rm keV} \pm \Delta F$	z (UH or MMT)	z (TNG)	$N_{\rm H}$	$L_{0.5{-}2.0~\rm keV}$	$M_{\rm B}$
		10^-13 erg cm ^-2 s^-1			cm^-2	10⁴⁴ erg s^-1	(from USNO B mag)
RX J1715.4+6239	NEP 1239	1.39 $\pm$ 0.30	0.8500	0.8500	$2.62\times 10^{20}$	4.88	-23.5
RX J1724.9+6636	NEP 1640	1.03 $\pm$ 0.25	0.6792	0.6758	$3.84\times 10^{20}$	2.08	-23.2
RX J1737.0+6601	NEP 2131	1.36 $\pm$ 0.20	0.3580	0.3585	$3.76\times 10^{20}$	0.60	-24.1

Source LaTeX | All tables | In the text

	1 Introduction
	2 The NEP sample of QSO 2 candidates
	3 Observations and data analysis
	4 Discussion and conclusions
	References