An ultradeep submillimetre map: beneath the SCUBA confusion limit with lensing and robust source extraction

Details An ultradeep submillimetre map: beneath the SCUBA confusion limit with lensing and robust source extraction An ultradeep submillimetre map: beneath the SCUBA confusion limit with lensing and robust source extraction

2006-02-06

arxiv.org/abs/astro-ph/0602131v1

Mon.Not.Roy.Astron.Soc. 368 (2006) 487

Astronomy and Astrophysics

Astrophysics

11 pages, 6 figures. Accepted for publication in MNRAS. Figures 2 and 4 (lower panel) available in higher resolution http://

Scientific paper

10.1111/j.1365-2966.2006.10138.x

Extracting sources with low signal-to-noise from maps with structured background is a non-trivial task which has become important in studying the faint end of the submillimetre number counts. In this article we study source extraction from submillimetre jiggle-maps from the Submillimetre Common-User Bolometer Array (SCUBA) using the Mexican Hat Wavelet (MHW), an isotropic wavelet technique. As a case study we use a large (11.8 arcmin^2) jiggle-map of the galaxy cluster Abell 2218, with a 850um 1sigma r.m.s. sensitivity of 0.6-1mJy. We show via simulations that MHW is a powerful tool for reliable extraction of low signal-to-noise sources from SCUBA jiggle-maps and nine sources are detected in the A2218 850um image. Three of these sources are identified as images of a single background source with an unlensed flux of 0.8mJy. Further, two single-imaged sources also have unlensed fluxes <2mJy, below the blank-field confusion limit. In this ultradeep map, the individual sources detected resolve nearly all of the extragalactic background light at 850um, and the deep data allow to put an upper limit of 44 sources per arcmin^2 to 0.2mJy at 850um.

Affiliated with

Also associated with

No associations

Rating

An ultradeep submillimetre map: beneath the SCUBA confusion limit with lensing and robust 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 ultradeep submillimetre map: beneath the SCUBA confusion limit with lensing and robust source extraction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An ultradeep submillimetre map: beneath the SCUBA confusion limit with lensing and robust source extraction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-62359