Transcript e-MERLIN & Radio issues Simon Garrington • Wide-fields (ie ~10x10 arcmin) uJy sensitivity; 50-150 mas resolution key science driver for e-MERLIN • ~1500 sources for.

e-MERLIN & Radio issues
Simon Garrington
• Wide-fields (ie ~10x10 arcmin)
uJy sensitivity; 50-150 mas resolution
key science driver for e-MERLIN
• ~1500 sources for deep 1.5 GHz field
• AG, VO tools already essential for
multi-l
• Making transition from expert to
routine use
GOODS HST/ACS N 16x10arcmin
e-MERLIN
Project Status
Pickmere
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DESIGN: 2x2 GHz;widefield;freq. flexible
Front-ends
– New C-band (4-8 GHz) installed
– L-band lens, mechanisms, horns: in place
Data Regeneration/
consolidation
Plumley
Winsford
Jodrell Bank
New fibre
installed
Leased ‘dark
fibre’ from various
providers
Crewe
IF,samplers
– Design/prototype: on telescope 05-06
Optical Amplifier
Darnhall
Fibre network
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90 km new dig + 600km trunk
All installed & connected
First light on local sections
Cambridge-Birmingham tests start today
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Digital & transmission
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Correlator
Nottingham
Knockin
Birmingham
Peterborough
– Modules ready for tests this year
– WIDAR from DRAO
– 16 x 128 MHz sub-bands; 2048 complex lags
– 1st fringes: prototype 2006 (4 tels 1 band)
– Full correlator 2007/8
Cambridge
Defford
e-MERLIN
software/imaging challenges
• All 1.5 GHz (5GHz) images will require wide-field mapping
To reach 1-3uJy noise in normal 12-24hr runs
• Wide-field & wide-band imaging techniques & algorithms
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EVLA, LOFAR, WSRT,LWA  KAT, NTD  SKA
‘Image-plane’ calibration (ionosphere; antenna pointing)
Wide-band imaging: MFS
Dwingeloo workshop June ’05: www.skatelescope.org
• ALBUS (RadioNET JRA) www.radionet-eu.org
– Advanced Long Baseline User Software
– ASTRON,JIVE,MPIfR,JBO
– Parallelisation;calibration;wide-field;wide-band
ALBUS Progress
• Smarter pipelines/scripts ... Improving the products
delivered to the users/archives
– Smart calibration
• Using GPS+Ionospheric models (Anderson. JIVE)
• Using WVR/GPS for tropospheric calibration (Roy, MPIfR)
– Better pipelines
• ParselTongue: Python for AIPS – ideal for CEA integration
(Kettenis, JIVE)
– Wide-band & Wide-field:
data splitting & task parallelisation & (JIVE, JBO)
Opportunity for AG Workflow management
Summary
• New generation of cm- and metre-wave radio
telescopes in 2007>
• New ways to access data
– Some (eg LOFAR) will be radically different
– Others eg e-MERLIN,EVLA
• Lots more data; wider fields; new algorithms required;
faster & smarter pipelines
• Expectation that data may not move
• Increased sensitivity will motivate more multi-l
studies using VO tools
• Of course, data will be VO-ready
– Renewed interest & effort in algorithms and
processing strategies
– No big new packages; interfaces to ‘legacy code’;
workflows etc. ParselTongue opportunity