Cosmology Legacy Survey Jim Dunlop University of Edinburgh + Ian Smail (Durham), Mark Halpern (UBC), Paul van der Werf (Leiden)

Cosmology Legacy Survey Why are extra-galactic sub-mm surveys interesting? Most star-formation activity at high z appears dust-enshrouded Key and challenging test for current galaxy-formation models Crucial for understanding link between star and black-hole formation

Hughes et al. 1998

Baugh et al. 2005

SCUBA-2 is a new CCD-style imager for the JCMT 50 sq arcmin FOV ~ 10 x SCUBA FOV Cosmology Legacy Survey Fully sampled imaging New TES detectors

SCUBA survey heritage Cosmology Legacy Survey HDF 8mJy SHADES

SCUBA2 Survey Strategy Cosmology Legacy Survey In the sub-mm, the standard survey “wedding cake” has been a bit squashed due to: Large (15 arcsec) beam size of the JCMT at 850 microns High background Effect of negative k-corrections Limited sensitivity and FOV of SCUBA SCUBA2 (on the JCMT) only changes the last of these

SCUBA2 Survey Strategy Cosmology Legacy Survey

Wide 850 survey – “Super SHADES” 20 sq degrees,   = 0.7 mJy ~10,000 sources with S/N > 10 ~Schmidt plate in area, to the depth of the SCUBA HDF image Accurate measurements of clustering and redshift distribution – placing luminous starbursts within  CDM Observing proto Coma clusters The bright source counts – extreme objects Bulge and black-hole formation Intermediate and low-redshift sources The SZ effect

Deep 450 micron survey 0.6 sq degree,   = 0.5 mJy, ~10000 sources Bolometric output of the 850 micron population Determining the source populations dominating the 450 micron background Exploiting high-resolution to beat down the confusion limit Exploiting high resolution to better identify the 850 micron sources + connect with Herschel and Spitzer data etc Resolving sub-mm sources – starbursts versus AGN etc

SCUBA2 Survey Strategy 2-year plan – fields dictated by multi-freq follow-up and accessibility 20 sq degree 850 micron survey to rms = 0.7 mJy XMM-LSS (5 sq deg), Lockman Hole (4 sq deg), CDFS (3 sq deg), ELAIS N1 (2 sq deg), COSMOS (2 sq deg), BOOTES (2 sq. deg), EGS (1 sq deg), AKARI NEP (1 sq deg) sq degree 450 micron survey to rms = 0.5 mJy GOODS-N (0.05 sq deg), GOODS-S ( sq deg), UDS (0.25 sq deg), COSMOS (0.25 sq deg), SA22 (0.02 sq deg), AKARI NEP (0.02 sq deg) sq degree 850 micron survey to rms = 0.15 mJy GOODS-N (0.05 sq deg), GOODS-S ( sq deg), UDS (0.25 sq deg) COSMOS (0.25 sq deg), SA22 (0.02 sq deg), AKARI NEP (0.02 sq deg) Cosmology Legacy Survey

1. Sub-mm galaxies and Structure Formation - discriminating galaxy formation models via clustering Cosmology Legacy Survey

1. Sub-mm galaxies and Structure Formation - discriminating galaxy formation models via clustering Cosmology Legacy Survey

1. Sub-mm galaxies and Structure Formation - discriminating galaxy formation models via clustering Cosmology Legacy Survey

1. Sub-mm galaxies and Structure Formation - placing sub-mm galaxies in the Lambda-CDM framework Cosmology Legacy Survey

1. Sub-mm galaxies and Structure Formation - the progenitors of extreme structures Cosmology Legacy Survey

2. Sub-mm galaxies and Cosmic Star Formation History Cosmology Legacy Survey Bright sources – extreme starbursts? Resolving the 450 background Bolometric luminosities – SCUBA2 + Herschel Faint sources The evolving sub-mm luminosity function Cosmic star-formation history

2. Sub-mm galaxies and Cosmic Star Formation History - bright sources – extreme starbursts Cosmology Legacy Survey

2. Sub-mm galaxies and Cosmic Star Formation History - extending dynamic range in the deep 850 image Cosmology Legacy Survey 0.1 sq deg, 850 input 0.1 sq deg, 850 image 0.1 sq deg, 850 recovered with aid of deep 450

2. Sub-mm galaxies and Cosmic Star Formation History - constructing the evolving sub-mm luminosity function Cosmology Legacy Survey

3. Towards a detailed understanding of galaxy formation Cosmology Legacy Survey Stellar masses and evolutionary status Testing semi-analytic and semi-numerical models Sub-mm source sizes Relationship between bulge and black-hole formation The sub-mm : Lyman break : ERO connection

3. Towards a detailed understanding of galaxy formation - testing semi-analytical and semi-numerical models Cosmology Legacy Survey

Survey Status Cosmology Legacy Survey Tri-national consortium of ~100 astronomers Survey approved in July hrs of band-1 time awarded to the 450 micron survey in semesters 07B,08A,08B,09A (=90% of all band-1 time) 630 hrs of band-2/3 time awarded to the 850 micron survey in semesters 07B,08A,08B,09A A further 1530 hrs awarded in semesters 09B-12A to extend 450 survey to 1.3 sq. deg, and 850 survey to 50 sq deg