An 850-micron SCUBA map of the Groth Strip and reliable source extraction

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

An 850-micron SCUBA map of the Groth Strip and reliable source extraction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with An 850-micron SCUBA map of the Groth Strip and reliable source extraction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An 850-micron SCUBA map of the Groth Strip and reliable source extraction will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1639854

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.