Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.6310c&link_type=abstract
American Astronomical Society Meeting 205, #63.10; Bulletin of the American Astronomical Society, Vol. 36, p.1451
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an 850-micron map and list of candidate sources in a sub-area of the Groth Strip obtained using SCUBA. The map consists of a long strip of adjoining jiggle-maps covering the southwestern 70 arcmin2 of the original WFPC2 Groth Strip to an average 1-sigma rms noise level of ˜ 3.5 mJy. We initially detect 7 candidate sources with signal-to-noise ratios (SNRs) between 3.0 and 3.5-sigma and 4 candidate sources with SNR>3.5. Simulations suggest that on average in a map this size one expects 1.6 false positive sources >3.5-sigma and 4.5 between 3 and 3.5-sigma. Flux boosting in maps is a well known effect and we have developed a simple Bayesian prescription for estimating the unboosted flux distribution and used this method to determine the best flux estimates of our sources. This method is easily adapted for any other modest signal-to-noise survey in which there is prior knowledge of the source counts. We performed follow-up photometry to test our flux boosting model on 5 of our candidate sources. We failed to significantly re-detect 3 of the sources, however, we did confirm the reality of 2 of the SCUBA sources, although at lower flux levels than suggested in the map. Not surprisingly, we find that the photometry results are consistent with and confirm the de-boosted map fluxes. Our final candidate source list contains 3 sources, including the 2 confirmed detections and 1 further candidate source with SNR>3.5-sigma which has a reasonable chance of being real.
This work was supported by the Natural Sciences and Engineering Research Council of Canada. The James Clerk Maxwell Telescope is operated on behalf of the Particle Physics and Astronomy Research Council of the United Kingdom, the Netherlands Organisation for Scientific Research, and the National Research Council of Canada.
Borys Colin
Chapman Sandra
Coppin Kirsten
Halpern Mark
Scott Daniel
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