tokens: 97% reliability threshold and matched to their input counterparts are plotted as blue circles. The red dashed line is the 1:1 relation, while the yellow contours indicate where most of the points lie. The Eddington bias flattening is clearly visible for input fluxes erg cm −2 s −1 . Bottom: ratio between the output and input flux as a function of the input flux for the simulations performed. The yellow filled circles are averages computed in bins of input flux, while the red horizontal line marks the 1:1 relation. 4. Source Detection We repeat the same procedure of source detection on the data mosaics. After deblending the list of potential sources, we detect 43 unique sources above the threshold of 99% reliability in at least one of the “canonical” F, S, and H bands. When considering the 97% reliability threshold, we detect 67 sources. We will refer to these catalogs as UDS99 and UDS97, respectively, and the detailed numbers for each band are reported in the last two rows of Table 5 . We note that the numbers of detections agree very well (within 1 σ of the distributions; see Figure 7 ) with the simulation expectations. To maximize the statistics, we will focus on UDS97 henceforth, keeping in mind that the spurious fraction of this catalog is 3%. 26 26 Details about this catalog can be found in the Appendix . For homogeneity with the other NuSTAR surveys, and given the few detections in the H1, H2, and VH bands, we will also consider only the 67 sources detected in the canonical bands (of which two are expected to be spurious), while discussing the results in the new bands elsewhere (A. Masini et al. 2018, in preparation). Table 6 shows how these 67 sources are distributed within the F, S, and H bands. Figure 7. Distribution of detections within the simulations. The six upper panels, in red, refer to the six bands at the 97% reliability threshold. The six lower panels, in green, refer to six bands at the 99% reliability threshold. From top left to bottom right, the bands are F, S, H, H1, H2, and VH. In each panel, the dashed lines mark the ±1 σ interval from the average, while the black solid line marks the position of the detections in the data mosaic, which are always within ±1 σ from the mean of the simulations, shown by the solid red or green line. Numerical values for the average number of detections in the simulations in each band and the number of detections in the data mosaics are explicitly addressed in the last four rows of Table 5 . Table 6 Summary of Detection, UDS97 Note. Capital letters are for sources above the threshold, while lowercase letters refer to sources detected but below the threshold. 4.1. Catalog Creation We create a catalog of the 67 sources detected in the three canonical bands of UDS97. Following the same strategy adopted for the simulations, we use dmextract to get total and background counts from circles of 20′′ radius, from the data and background mosaics, respectively. Similarly, we extract the exposures from
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