1. The JCMT in the ALMA Era Surveying the Sub-millimetre Sky (Canada / Netherlands / Great Britain) Doug Johnstone NRC/HIA

2. A New Suite of Instruments Faster bolometer array (SCUBA2) –Continuum mapping at multiple wavelengths Ancillary devices (polarimeter, FTS) –Magnetic fields, line- and SED-fitting Heterodyne Receiver Array (HARP-B) –16 receivers @350 GHz (CO 3-2 etc) Submillimetre array (eSMA)

3. SCUBA2 The Future of Sub-Millimetre Mapping >100 times faster than present instruments Survey large regions of the sky quickly –Square degrees per hour Survey to the point-source confusion limit –Allow for ‘complete’ source counts Finding chart for ALMA –Beam size 15", centroid to a few arcseconds

5. SCUBA2 Key Features A large 7x7 arcminute field-of-view –Fully sampled - Nyquist at 850  m Sensitivity governed by the sky background Simultaneous imaging at 850  m & 450  m No chopping required –Greater sensitivity to large-scale structure ~8 arcmin (~100mm) Focal plane layout

6. Estimated performance Parameter 450  m SCUBASCUBA-2 850  m SCUBASCUBA-2 Per-pixel NEFD (mJy/  Hz) 400759032 Point-source NEFD (mJy/  Hz) 4001079022 Point source flux Extraction speed 110112 Large area mapping speed 18101980

7. Large-scale surveys Herschel/SPIRE (350  m) 25 arcsec : 16 arcmin 2 (simulation by Hughes & Gaztanaga) Compact ALMA (450  m) 0.01 arcsec : 0.02 arcmin 2 JCMT/SCUBA (850  m) 14 arcsec : 5 arcmin 2 (HDF image from Hughes et al. 1998) JCMT/SCUBA-2 (450  m) 7 arcsec resolution : 64 arcmin 2 field-of-view (simulation by Governato et al.) SCUBA-2 will map large areas of sky at least 10 times faster than ALMA to the same S/N...

8. Deep extragalactic surveys Deep imaging? It would take SCUBA-2 ~50 hours to map 1 deg 2 area of sky to the confusion limit (0.5 mJy) at 850  m A 50-hr observation with SCUBA

9. Wide-field Galactic surveys All sky survey? It would take SCUBA-2 ~500 hours to map the entire Mauna Kea sky to the depth of the SCUBA Galactic Centre image ~15 shifts (or 120 hrs) of telescope time SCUBA-2 could map the entire area shown left in just a couple of hours to the same S/N... Full moon Galactic Plane SCUBA Galactic Centre Survey

10. Ophiuchus – JCMT 2003 In 2003 observed 4 sq. degrees to 40 mJy/bm as part of the COMPLETE Project. Took 40 hours! Largest SCUBA map to date Expect 100’s of new compact sources Found only 2!

11. Ancillary Instruments Polarimeter –Measure polarized emission and orientation Importance of magnetic fields (especially in regions of star formation) Study the properties of dust Fourier Transform Spectrometer –Moderate-resolution spectrum Quickly obtain strong emission lines (e.g. CO) Hot core diagnostics –Low-resolution spectrum SED shape - temperature and dust emissivity

12. Polarimetry of the Orion Ridge

13. When and How? SCUBA2 on the telescope by end of 2005 –Full functionality in 2006 Legacy Surveys being determined NOW! –Likely 50% of telescope time –Still time to forward ideas to JCMT members Tri-Partate agreement for JCMT expires 2009 –Future of the JCMT beyond 2009 open to ideas –There will still be a great deal of sky to map! Partenership Opportunities

14. SCUBA-2 Website: http://www.roe.ac.uk/ukatc/projects/scubatwo Canadian SCUBA-2 Consortium