e-merlin MERLIN background e-merlin Project Science
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1 e-merlin MERLIN background e-merlin Project Science
2 MERLIN:background (1) Jodrell Bank pioneered longbaseline interferometers (>100km) with small remote telescopes and radio links Driven by quest to establish nature and size of radio stars : 1950 s & 60 s Key technical development was phase stable link (1973) Most of information through phase Allows coherent integration to make deep images
3 MERLIN: background (2) By 1980 developed into MERLIN Network of 6 telescopes; 127km Extended to 217km with telescope at Cambridge (1990) Motivated by high resolution ( mas at cm wavelengths); real time 7x resolution of VLA: can resolve Novae; SNR shells in M82 Starforminggalaxies at z~1 Key technical advances Affordable data links with 30 MHz b/w Clock distribution (few ps) Sensitivity limited by link bandwidth ~ 50 ujy/beam at 5 GHz
4 Optical fibres Optical fibres allow ~Tb/s per fibre over 100km without amplification already used in ATCA, GMRT key part of ALMA, EVLA Available as part of national and international commercial and research communications infrastructures Can support GHz bandwidths for e-merlin and Gb/s realtime operation for EVN
5 e-merlin Project Funded from 2002: Univ Manchester, NWDA, PPARC/STFC, Cambridge, UMIST, LJMU. 8M Tightly focused on sensitivity upgrade using fibre links for 2 GHz bandwidth Design goals 2 GHz bandwidth (in each pol) New C-band: 4-8 GHz Rx suite Upgrade L-band: GHz Upgrade K-band: GHz Rapid (1min) change between bands No compromise in phase stability Correlator: Wide-field (<0.5MHz) & spectral line (<0.5 khz) Low-cost share development (ALMA/EVLA/e-MERLIN DTS) Re-use some components
6 e-merlin: Progress Receivers: done IF & electronics: prototype Fibre network: in Correlator: DRAO prototype Software: in progress Knockin Darnhall Pickmere Jodrell Bank Crewe Birmingham Nottingham Peterboro First fringes with protocorrelator: Mid 08 Cambridge Defford
7 WIDAR Correlator Developed by DRAO, Penticton (Canada) and NRAO [for EVLA] 2 x 2 GHz wide band sampled at telescope (2x 4 Gs/s with 3 bit samples) and transmitted using 3 x 10Gb/s optical wavelengths with custom transmission equipment Correlator splits input to 16 x 128 MHz sub-bands using digital filters Sub-bands correlated using 16 x 64 x 2048 complex-lag correlator chips 0.25 MHz channel resolution for 4 polarisations at maximum bandwidth KHz resolution for spectroscopy, Hz resolution for radar
8 Capabilities 150, 40, 10 mas resolution at L[20cm],C[6cm],K[1,3cm] ~2 ujy sensitivity in typical runs <ujy in deep fields ~30 ujy in ~1 min Wide fields Out to HPBW of 25-m [9,30 arcmin] Spectroscopy 16 placeable sub-bands;>512 channels/pol; recirculation Can mix/trade bandwidths; no. of channels, polarisations Much improved aperture coverage Via frequency coverage May help snapshots too Spectral mapping ; 5-7/4-8 GHz Polarization (L,R IQUV) Astrometry Goal is < 1 mas wrt ICRF
9 e-merlin: Science open facility Conventional + legacy programmes (surveys) Close link with European VLBI Network (EVN) Regular joint observations Combined real time operation Key topics: Formation processes of stars Jets, winds, disks Activities in nearby galaxies Black holes, supernovae, starclusters Distant galaxies Starformation & AGN Gravitational lenses Dark matter distribution Capabilities 1.3, 6, 20cm mas resolution (~ ALMA, JWST) 2 30 arcmin field of view (24k x 24k pixels) OIII ~2 + ujy/beam MERLIN sensitivity Graham, STG et al MERLIN+EVN 20cm D Fenech, JBO
10 e-merlin: Science Key topics: Formation processes of stars Jets, winds, disks Activities in nearby galaxies Black holes, supernovae, starclusters Distant galaxies Starformation & AGN Gravitational lenses Dark matter distribution Capabilities 1.3, 6, 20cm mas resolution (~ ALMA, MERLIN/HST JWST) York et 2 al arcmin field of view (24k x 24k pixels) ~2 ujy/beam sensitivity All require >100 km baselines
11 Using MERLIN Open facility Propose using Northstar tool Deadlines Mar & Sep Limited observations in
12 Using e-merlin Powerful new combination of high resolution and sensitivity Data analysis similar to MERLIN, EVLA Open facility Legacy programme for large projects Projects being designed now, teams open Commissioning & early science 2008 Full operations 2009
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