Optimal Multiwavelength Source Detection: Experience Gained from the WISE Mission

Abstract

We discuss the optimal detection of point sources from multiwavelength imaging data using an approach, referred to as MDET, which requires no prior knowledge of the source spectrum. MDET may be regarded as a somewhat more general version of the so-called "chi squared" technique. We describe the theoretical basis of the technique, and show examples of its performance with four-channel infrared broad-band imaging data from the WISE mission. We also discuss the potential benefits of applying it to the multifrequency data cubes of the ASKAP surveys, and suggest that it could increase the detection sensitivity of searches for neutral hydrogen emission at moderately high redshifts.

7 pages, 2 figures; accepted for publication in PASA. Formatting problem in Table 1 corrected

References in corpus (4)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Science with ASKAP - the Australian Square Kilometre Array Pathfinder
• The First Ultra-Cool Brown Dwarf Discovered by the Wide-field Infrared Survey Explorer
• Detecting neutral hydrogen in emission at redshift z ~ 1

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• The CatWISE Preliminary Catalog: Motions from $WISE$ and $NEOWISE$ Data
• Overview on spectral line source finding and visualisation
• Identification of Young Stellar Object candidates in the $Gaia$ DR2 x AllWISE catalogue with machine learning methods
• The Massive and Distant Clusters of WISE Survey. I: Survey Overview and a Catalog of >2000 Galaxy Clusters at z~1
• CWISEP J193518.59$-$154620.3: An Extremely Cold Brown Dwarf in the Solar Neighborhood Discovered with CatWISE
• Large scale star formation in Auriga region