Figure 1 from An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: Number Counts of Submillimeter Galaxies

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An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: Number Counts of Submillimeter Galaxies

Authors: Stuart M. Stach, Ian Smail, A.M. Swinbank, J.M. Simpson, J.E. Geach, Fang Xia An, Omar Almaini, Vinodiran Arumugam, A.W. Blain, S.C. Chapman, Chian-Chou Chen, C.J. Conselice, E.A. Cooke, K.E. K. Coppin, J.S. Dunlop, Duncan Farrah, B. Gullberg, W. Hartley, R.J. Ivison, D.T. Maltby, M.J. Michałowski, Douglas Scott, Chris Simpson, A.P. Thomson, J.L. Wardlow, and P. van der Werf

2018 The Astrophysical Journal 860 161.

Provider: AAS Journals

Caption: Figure 1.

Cumulative numbers of sources detected in our 716 ALMA maps above a given signal-to-noise ratio in both the tapered detection maps (positive) and the inverted detection maps (negative). We select a S/N threshold for the final AS2UDS catalog which minimizes the contamination from spurious detections, as estimated from the number of equivalent S/N negative sources. We show the corresponding “purity” as a function of S/N threshold and mark our adopted 4.3σ threshold (dashed line), which yields a 98% purity, equivalent to 14 false sources in a final catalog of 695 SMGs.

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