Omega Super nov05 public

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Observing superclusters with OmegaCAM


basics Large area =10 – 100 Sq Degree Seeing 0.7 arcsec 2-3 mag andgt; SDSS Nearby Superclusters OmegaCAM: broad band + Halpha z: 6dF – AAOmega X-ray: XMM, Chandra HI: WSRT/VLA Theoretical large scale structure

Science Goals : 

Science Goals Study transition cluster to inter-cluster regions in superclusters Sites and processes of morphological transitions Sites of star formation Role of gas (hot and cold) Halpha, HI, X-ray environmental effects on galaxy evolution evolution at the outskirts of clusters type-evolution as function of environment Relation to large scale structure formation studying filamentary galaxy structures outside the dense clusters: nearby (zandlt;0.1) superclusters 10 – 100 SqDeg – Hercules Compact, North, has everything Horologium huge, complex , South, unexplored 2dF South high redshift ( zandgt; 0.6) superclusters – 2 * 2 Sq Deg



NGP Richard Powell

Supercluster survey: 

Supercluster survey S/N=5 Ab magnitudes Medium deep survey 2h/field 5 sigma, 2000 sec: g’(25.6), r’(25), i’(24.4), z’(23.2) 2dF – SGP (Piscus/Cetus) KIDS 200 Sq Deg Horologium -andgt; 100 Deep Survey 6 h/field u’ (2h) g’, r’,i’, z’ (1h) 5 sigma : u’ (25.7), g’(26.3), r’(25.7), i’(25.1), z’(23.9) Hercules 12 Sq Dg - andgt; 8 4 x Halpha (2h/field)-andgt; 3 Very Deep Survey 4 fields ~ 12 h/field all 5 nights 5 sig g’ 2h( 26,7), r’ 2h(26.1), i’ 4 h(25.8), z’ 4h (24.6) 2 Hercules - 2 Horologium -

Hercules super: 

Hercules super


Horologium 6dF redshifts- J Rose 6 brightest clusters Chandra AA Omega Vimos

run at WFI@2.2m: 

run at WFI@2.2m 10 Nights Nov 2004 B (26 m) - 45 min V(25m) R(24.5) -25 min I (24.5) - 25 min 5 Sq Deg 22 fields OmegaCAM paradigm 2500 redshifts available Ph D Sikkema GOODs Field + Survey 2dF SGP South Galactic Pole -andgt;KIDS

Horologium superclustercz= 20100 km/sec; 40 Abell clusters 25 x 12 Deg: 

Horologium supercluster cz= 20100 km/sec; 40 Abell clusters 25 x 12 Deg As noted by Shapley 1935 100 Mpc


Astro-Wise Distributed approach Add surface photometry package: Peletier, La Barbera, Sikkema, Schneider, Haynes, Pohlen, Busarello, Mercurio, Merluzzi, Heraudeau  Splinter

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