cosmology legacy survey jim dunlop university of edinburgh + ian smail (durham), mark halpern (ubc),...

Cosmology Legacy Survey

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


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


Fully sampled imaging

New TES detectors

SCUBA survey heritage


HDF 8mJy SHADES

SCUBA2 Survey Strategy


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

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


2-year plan – fields dictated by multi-freq follow-up and accessibility

20 sq degree 850 micron survey to rms = 0.7 mJyXMM-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)

0.6-0.9 sq degree 450 micron survey to rms = 0.5 mJyGOODS-N (0.05 sq deg), GOODS-S (0.05-0.25 sq deg), UDS (0.25 sq deg), COSMOS (0.25 sq deg), SA22 (0.02 sq deg), AKARI NEP (0.02 sq deg)

0.6-0.9 sq degree 850 micron survey to rms = 0.15 mJyGOODS-N (0.05 sq deg), GOODS-S (0.05-0.25 sq deg), UDS (0.25 sq deg)COSMOS (0.25 sq deg), SA22 (0.02 sq deg), AKARI NEP (0.02 sq deg)


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


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


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


2. Sub-mm galaxies and Cosmic Star Formation History


• 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


2. Sub-mm galaxies and Cosmic Star Formation History - extending dynamic range in the deep 850 image


0.1 sq deg, 850 input0.1 sq deg, 850 image0.1 sq deg, 850 recoveredwith aid of deep 450

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


3. Towards a detailed understanding of galaxy formation


• 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


Survey Status


Tri-national consortium of ~100 astronomers

Survey approved in July 2005

490 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

cosmology legacy survey jim dunlop university of edinburgh + ian smail (durham), mark halpern (ubc),...

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