zwart

Early Science with AMI: 

Early Science with AMI Jonathan Zwart jtlz2@mrao.cam.ac.uk

Overview: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 2 Overview Case Study: Abell 1914 Observing strategy & science goals Early cluster targets Survey plans

A1914: 228 Hours with Ryle: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 3 A1914: 228 Hours with Ryle

A1914: 34 Hours with AMI: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 4 A1914: 34 Hours with AMI Long baselines Short baselines (after radio sources removed)

Slide 5: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 5

Slide 6: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 6 Only 7 (/10) antennas 18 point sources subtracted  Need for source subtraction astro-ph/0509215 (MNRAS accepted)

Observing Strategy: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 7 Observing Strategy Known clusters Initial blind surveys Surveys of equatorial fields (need LA) Joint fields (AMiBA, SZA, UKIDSS…)

Early Cluster Targets: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 8 Early Cluster Targets Abell (optical) & NORAS (X-ray) MACS (X-ray, Ebeling et al. 2000) High-z candidates Ryle source survey (2004–): 4 days for each of ~ 100 ‘lucky’ targets

NORAS-Selected Clusters: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 9 NORAS-Selected Clusters Selection criteria: LX > 6.8×1044 erg s-1 z > 0.1 Calibrate scaling relations L–T, M, etc +X-ray  g, H0 A263: 10 hours; z = 0.3; (Natasha Hurley-Walker)

MACS-Selected Clusters: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 10 MACS-Selected Clusters Selection criteria: LX > 1045 erg s-1 z > 0.5 Evolution of scaling relations with z +X-ray  g (z), H0, q0 MACS 0717+37: 8 hours; z = 0.545

Blind Surveys: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 11 Blind Surveys ‘Wedding cake’: 10 □° deep survey (1 year) 100 □° shallow survey (6 months) Evolution of cluster population, N(m,z) Some experimenting with z from SZ alone But for now obtain redshifts independently…

Deep Survey – Optical Fields: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 12 Deep Survey – Optical Fields ~ 10 sq. deg. on CFHT R = 24.5, z’ = 23.5 (AB) WFCAM K = 21.0 (AB) Clusters out to z ~ 1.5 Feedback on SZ selection function Red Cluster Sequence (e.g. Gladders & Yee) Voronoi tessellation (Culverhouse) Full Bayesian analysis (Zwart & Hobson) Spectroscopy 0.96°

Other Science: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 13 Other Science CMB power spectrum at high angular scales (ℓ > 3000, cf VSA) Other non-Gaussian features, e.g. cosmic strings, ionization regions

Summary: 

19 March 2006 Jonathan Zwart, Cavendish Astrophysics 14 Summary AMI has started obs of known clusters (astro-ph/0509215) Shallow blind survey of optical fields begins summer 2006 Deep survey as soon as LA commissioned Open to guest observers