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Early Science with AMI Jonathan Zwart

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1 Early Science with AMI Jonathan Zwart

2 19 March 2006Jonathan Zwart, Cavendish Astrophysics2 Overview Case Study: Abell 1914 Observing strategy & science goals –Early cluster targets –Survey plans

3 19 March 2006Jonathan Zwart, Cavendish Astrophysics3 A1914: 228 Hours with Ryle

4 19 March 2006Jonathan Zwart, Cavendish Astrophysics4 A1914: 34 Hours with AMI Long baselinesShort baselines (after radio sources removed)

5 19 March 2006Jonathan Zwart, Cavendish Astrophysics5

6 19 March 2006Jonathan Zwart, Cavendish Astrophysics6 Only 7 (/10) antennas 18 point sources subtracted Need for source subtraction astro-ph/ (MNRAS accepted)

7 19 March 2006Jonathan Zwart, Cavendish Astrophysics7 Observing Strategy Known clusters Initial blind surveys Surveys of equatorial fields (need LA) Joint fields (AMiBA, SZA, UKIDSS…)

8 19 March 2006Jonathan Zwart, Cavendish Astrophysics8 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

9 19 March 2006Jonathan Zwart, Cavendish Astrophysics9 NORAS-Selected Clusters Selection criteria: –L X > 6.8×10 44 erg s -1 –z > 0.1 Calibrate scaling relations L–T, M, etc +X-ray g, H 0 A263: 10 hours; z = 0.3; (Natasha Hurley-Walker)

10 19 March 2006Jonathan Zwart, Cavendish Astrophysics10 MACS-Selected Clusters Selection criteria: –L X > erg s -1 –z > 0.5 Evolution of scaling relations with z +X-ray g (z), H 0, q 0 MACS : 8 hours; z = 0.545

11 19 March 2006Jonathan Zwart, Cavendish Astrophysics11 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…

12 19 March 2006Jonathan Zwart, Cavendish Astrophysics12 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 °

13 19 March 2006Jonathan Zwart, Cavendish Astrophysics13 Other Science CMB power spectrum at high angular scales ( > 3000, cf VSA) Other non-Gaussian features, e.g. cosmic strings, ionization regions

14 19 March 2006Jonathan Zwart, Cavendish Astrophysics14 Summary AMI has started obs of known clusters (astro-ph/ ) Shallow blind survey of optical fields begins summer 2006 Deep survey as soon as LA commissioned Open to guest observers


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