An AzTEC 1.1 mm Survey of the GOODS-N Field I: Maps, Catalogue, and Source Statistics

TL;DR

This paper presents a deep 1.1 mm survey of the GOODS-N field with AzTEC, providing maps, a source catalogue, and number counts, revealing 28 robust sources and consistent results with previous surveys.

Contribution

First uniform 1.1 mm survey of GOODS-N with detailed maps, catalogue, and number counts, improving over previous non-uniform surveys.

Findings

28 source candidates with S/N >= 3.75, few spurious detections

8 sources also detected by SCUBA at 850 um

Number counts fit a specific functional form in 2-6 mJy range

Abstract

We have conducted a deep and uniform 1.1 mm survey of the GOODS-N field with AzTEC on the James Clerk Maxwell Telescope (JCMT). Here we present the first results from this survey including maps, the source catalogue, and 1.1 mm number-counts. The results presented here were obtained from a 245 sq-arcmin region with near uniform coverage to a depth of 0.96-1.16 mJy/beam. Our robust catalogue contains 28 source candidates detected with S/N >= 3.75, only 1-2 of which are expected to be spurious detections. Of these source candidates, 8 are also detected by SCUBA at 850 um in regions where there is good overlap between the two surveys. The major advantage of our survey over that with SCUBA is the uniformity of coverage. We calculate number counts using two different techniques: the first using a frequentist parameter estimation, and the second using a Bayesian method. The two sets of results are in good agreement. We find that the 1.1 mm differential number counts are well described in the 2-6 mJy range by the functional form dN/dS = N' (S'/S) exp(-S/S') with fitted parameters S' = 1.25 +/-0.38 mJy and dN/dS = 300 +/- 90 per mJy per sq-deg at 3 mJy.