Table 5: Upper limits to the BD X-ray luminosities. The hydrogen column density in unit of 1021 cm-2 given in Col. (3) is obtained from the optical extinction using the relation $N_{\rm H,21} = 1.6 \times A_{\rm V}$ cm-2 mag-1 (Cardelli et al. 1989; Vuong et al. 2003). Exposure times in Col. (4) are for summed EPIC (pn+M1+M2) data, in units equivalent for a pn-on-axis observation. Columns (5) and (6) give the upper limits at the 95% confidence level for net counts in the 0.5-2 keV energy range and the X-ray luminosity in the 0.5-8 keV energy range corrected for absorption, respectively. The upper limit to the X-ray fractional luminosity, $\eta=\log (L_{\rm X}/L_*)$, is given in the last column.
BD name XEST $N_{\rm H,21}$ Exp. N $L_{\rm X,27}$ $\eta$
  #  cm-2 ks cnts erg s-1  
(1) (2) (3) (4) (5) (6) (7)
2MASS J0414 20 1.1 44.7 115.5 15.8 -3.6
2MASS J0421 11 4.8 38.4 19.5 6.1 -3.3
KPNO-Tau 2 23+24 0.6 22.1 30.2 6.0 -3.6
KPNO-Tau 4 02 3.9 51.8 25.8 5.0 -3.5
KPNO-Tau 6 14 0.1 26.8 31.1 6.4 -3.3
KPNO-Tau 7 14 0.1 25.6 16.9 2.5 -3.8
KPNO-Tau 9 08+09 0.1 51.5 37.9 2.8 -3.1
CFHT-BD-Tau 2 08 0.1 33.9 25.5 2.9 -4.0


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