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Table 2:

Optical counterparts to Chandra X-ray sources within the HST/ACS field of view.

X-ray 		Offset From CXO positiona $U_{\rm 336}$ $B_{\rm 439}$ $V_{\rm 555}$ $V_{\rm 606}$ $I_{\rm 814}$ log($L_{\rm X}$)b log( $f_{\rm X}/f_{\rm O}$)c FAPd Classificatione
Source $\Delta$RA ( $\hbox{$^{\prime\prime}$ }$) $\Delta$Dec. ( $\hbox{$^{\prime\prime}$ }$) (mag) (mag) (mag) (mag) (mag) ${\rm erg~s^{-1}}$      
Inside the half-mass radius
s01 0.22 0.49 ...f ... ... 20.85(0) 19.94(2) 29.85 -2.02 26.06 AB?
s02 0.0 -0.05 ... ... ... 17.38(1) 16.32(1) 31.18 -2.08 1.08 AB
s03a 0.18 -0.69 18.68(6) 18.35(4) 17.78(4) 18.33(1) 17.56(0) 29.95 -2.93 7.01 AB?
s03b -0.50 -0.29 19.32(9) 19.09(4) 18.44(4) 18.90(1) 18.11(0) 29.95 -2.70 10.36 AB?
s03c -0.57 0.37 xg x x 23.8(1) 22.81(6) 29.95 -0.76 37.35 CV/AGN?
s04 0.07 -0.02 ... ... ... 16.92(1) 16.01(1) 30.63 -2.82 0.73 AB?
s05 0.06 -0.05 ... ... ... 22.42(5) 21.79(0) 31.61 0.37 11.98 CV/AGN?
s06 0.04 -0.08 ... ... ... 17.74(1) 16.91(1) 30.15 -2.96 2.67 AB?
s07 0.33 -0.11 16.26(2) 15.16(5) 14.30(5) 14.86(0) 13.89(0) 30.31 -3.96 0.25 AB?
s08 0.24 -0.17 x x x 21.48(2) 19.96(1) 30.78 -0.84 11.31 MSP
s10 0.27 0.05 x x x 25.25(6) 23.4(1) 30.37 0.26 21.96 CV/AGN?
s12 0.28 -0.10 16.40(2) 15.60(3) 14.93(3) 15.55(0) 14.82(0) 29.88 -4.11 0.72 AB?
s14a -0.29 0.54 x x x 23.47(6) 20.87(2) 30.03 -0.80 33.60 F?
s14b -0.04 -0.18 x x x 25.8(1) 28(2) 30.03 0.12 48.35 CV/AGN?
s14c 0.18 0.36 x x x 26.4(2) 23.46(6) 30.03 0.36 51.13 CV/AGN?
s15 0.10 0.06 ... ... ... 21.06(6) 19.98(4) 31.0 -0.79 10.37 CV/AB?
s16 0.15 -0.09 19.9(1) 18.62(4) 17.55(3) 17.95(1) 16.88(0) 30.15 -2.88 3.44 F?
s18 0.08 -0.08 17.25(3) 16.96(6) 16.28(6) 16.69(1) 15.92(1) 30.77 -2.77 0.58 AB
s19a 0.08 -0.12 18.20(5) 17.79(3) 16.99(3) 17.39(0) 16.50(0) 30.95 -2.30 1.16 AB?
s19b -0.28 0.10 19.52(9) 18.93(4) 18.32(4) 18.83(1) 18.05(1) 30.95 -1.73 4.62 AB?
s19c 0.18 0.36 x x x 21.48(1) 20.04(2) 30.95 -0.66 11.33 AB?
s20 0.08 -0.07 16.16(2) 15.21(3) 14.18(4) 14.65(0) 13.61(0) 31.18 -3.17 0.16 AB
s21 0.17 -0.15 x x x 27.09(9) 26.5(3) 29.99 0.61 42.03 CV/AGN?
s22 0.14 -0.15 19.01(7) 18.22(5) 17.52(3) 18.03(0) 17.22(1) 30.02 -2.98 5.48 F?
s23 0.32 0.09 18.11(5) 17.75(3) 17.19(3) 17.73(1) 16.73(1) 30.22 -2.91 2.49 AB?
s24 0.21 0.05 x 20.3(1) 19.13(4) 19.4(1) 18.16(1) 30.02 -2.43 9.81 F
s25 0.08 0.06 x x x 25.49(8) 23.3(1) 30.03 0.01 30.34 CV/AGN?
s26 -0.07 -0.08 ... 19.3(2) 18.33(7) 18.63(7) 17.50(3) 30.66 -2.10 4.88 F
s27a 0.19 0.17 16.06(2) 15.15(4) 14.23(4) 14.68(0) 13.70(0) 30.22 -4.12 0.24 AB?
s27b -0.57 0.06 19.18(8) 18.41(3) 17.73(3) 18.19(1) 17.45(1) 30.22 -2.72 4.09 AB?
s28a 0.35 -0.06 x ... ... 20.67(0) 18.81(0) 29.99 -1.96 17.96 F?
s28b -0.15 0.44 x ... ... 20.28(1) 19.28(1) 29.99 -2.11 16.12 AB?
s29 0.05 0.06 21.0(2) ... 20.9(2) 21.44(1) 20.76(1) 30.85 -0.79 11.20 CV
Outside the half-mass radius
s41 0.13 -0.12 ... ... ... 21.53(1) 20.77(1) 30.69 -0.91 14.47 CV/AGN?
s49a -0.24 0.09 ... 19.87(7) 18.49(3) 18.74(1) 16.72(1) 30.13 -2.59 9.43 F
s49b -0.31 -0.38 ... x x 20.93(2) 18.35(1) 30.12 -1.71 21.64 F
s54a 0.68 0.20 ... ... ... 15.36(0) 14.46(0) 30.62 -3.45 0.65h AB?
s54b -0.23 -0.05 ... ... ... 21.46(1) 20.72(1) 30.62 -1.01 19.76h CV/AGN?

Notes.  (a) The position offsets of sources detected in the $V_{\rm 606}$ band are given relative to their Chandra positions (see Elsner et al. 2008 for details). (b) $L_{\rm X}$: unabsorbed X-ray luminosity in the energy band is 0.5-2.5 keV (see Table 5 of Elsner et al. 2008). (c) Ratio of X-ray to optical ( $V_{\rm 606}$) flux is computed by using log( $f_{\rm X}/f_{\rm O}$) = log  $f_{\rm X} + 0.4V_{\rm 606} + 5.07$; $f_{\rm X}$ is derived in the 0.5-2.5 keV band. (d) FAP: false alarm probability (%). The probability of a chance coincidence in % is calculated from $P_{\rm coinc}=N(<m)\pi r_{95}^2/A_{\rm search}$ (see Sect. 6.1 of Elsner et al. 2008). The search area, $A_{\rm search}$, is the central region of M 71 with the radius of $2\hbox{$^\prime$ }$ (see Anderson et al. 2008) and the considered magnitude, m, is $V_{\rm 606}$ band magnitude. (e) MSP: millisecond pulsar; CV: cataclysmic variable; AB: X-ray active binary; AGN: active galactic nucleus; F: foreground source; ?: all cases where we are not certain about the nature of the X-ray source. (f) Sources lying outside the field-of-view of the WFPC2 chips do not have F336W, F439W or F555W data. (g) Under detection limit. (h) Since the source is outside the searching region of the 2'-radius central circle (Anderson et al. 2008), the $A_{\rm search}$ for the probability of a chance coincidence is calculated with the HST/ACS field of view, i.e. $202\hbox{$^{\prime\prime}$ }\times 202\hbox{$^{\prime\prime}$ }$.


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