SCUBA-2: iterative map-making with the Sub-Millimetre User Reduction Facility

被引:257
作者
Chapin, Edward L. [1 ,2 ]
Berry, David S. [2 ]
Gibb, Andrew G. [1 ]
Jenness, Tim [2 ]
Scott, Douglas [1 ]
Tilanus, Remo P. J. [2 ,3 ]
Economou, Frossie [2 ]
Holland, Wayne S. [4 ,5 ]
机构
[1] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[2] Joint Astron Ctr, Hilo, HI 96720 USA
[3] Netherlands Org Sci Res, NL-2509 AC The Hague, Netherlands
[4] Royal Observ, UK Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland
[5] Univ Edinburgh, Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland
基金
加拿大创新基金会; 加拿大自然科学与工程研究理事会;
关键词
methods: data analysis; methods: observational; techniques: image processing; submillimetre: general; ATACAMA COSMOLOGY TELESCOPE; DEGREE EXTRAGALACTIC SURVEY; BACKGROUND POWER SPECTRUM; SOUTH-POLE TELESCOPE; DEEP FIELD-SOUTH; GOODS-N FIELD; 1.1 MM SURVEY; NUMBER COUNTS; SOFTWARE COLLECTION; SUPER-MAP;
D O I
10.1093/mnras/stt052
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Submillimetre Common User Bolometer Array 2 (SCUBA-2) is an instrument operating on the 15-m James Clerk Maxwell Telescope, nominally consisting of 5120 bolometers in each of two simultaneous imaging bands centred over 450 and 850 mu m. The camera is operated by scanning across the sky and recording data at a rate of 200 Hz. As the largest of a new generation of multiplexed kilopixel bolometer cameras operating in the (sub) millimetre, SCUBA-2 data analysis represents a significant challenge. We describe the production of maps using SMURF (Sub-Millimetre User Reduction Facility) in which we have adopted a fast, iterative approach to map-making that enables data reduction on single, modern, high-end desktop computers, with execution times that are typically shorter than the observing times. SMURF is used in an automated setting, both at the telescope for real-time feedback to observers and for the production of science products for the JCMT Science Archive at the Canadian Astronomy Data Centre. Three detailed case studies are used to: (i) explore convergence properties of the map-maker using simple prior constraints (Uranus - a point source); (ii) achieve the white-noise limit for faint point-source studies (extragalactic blank-field survey of the Lockman Hole); and (iii) demonstrate that our strategy is capable of recovering angular scales comparable to the size of the array footprint (approximately 5 arcmin) for bright extended sources (star-forming region M17).
引用
收藏
页码:2545 / 2573
页数:29
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