Swedish LOFAR: John Conway Hamburg, Sept 17th, 2008 Onsala Space Observatory, Swedish national facility for radio astronomy, provides access for Swedish.

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Presentation transcript:

Swedish LOFAR: John Conway Hamburg, Sept 17th, 2008 Onsala Space Observatory, Swedish national facility for radio astronomy, provides access for Swedish astronomers to radio/mm- facilities. Separate low-freq effort led by IRF (see Bo Thide’s talk yesterday) – LOIS, alternative antenna design, experimental, look for POAM etc Onsala has long time involvement in interferometry, VLBI, ALMA etc. Involved with real-time VLBI interferometry over the internet since Synergy with LOFAR.

First Transatlantic Radio Interferometry, Onsala, January 1968 Using recorded media, definitely not real-time.

JANET NetNorthWest Jodrell Bank JIVE + LOFAR. FUNET Metsähovi SUNET Onsala NORDUnet routed IP (simplified view) GÉANT2 Rest of SUNET NORDUnet TSS Opto TSS L2 Cloud STO CSC CPH Rest of FUNET SurfNET SUNET project router VLANs HAM Network Infrastructure- lots of cooperation with SUNET, NORDUNET Data goes through Hamburg

Recent Internet Interferometry Progress In June 2008 demonstrated 4Gbps from Stockholm through to Jodrell Bank UK In July 2008 demonstrated 8Gbps from Onsala to Metsahovi in Finland (8 times higher data rate than disk recording!) Autocorrelation spectra on water masers Have up to 10Gbit/s capacity through to Netherlands so we can simultaneously send eVLBI and LOFAR data

Joint the centimetre and decametre wavelength interferometry communities All invited to conference on Science and technology of real time interferometry. Madrid, June t 2009

E-LOFAR 96 HBA tiles 96 LBAs Inter-tile distance: 0.6m Swedish station greatly helps NS uv coverage

LOFAR station at Onsala Research council planning grant for 2006/2007 (600kKr = 70kEuro). Meetings, RFI (radio frequency interference) test of our site by ASTRON–positive result November 2007 Swedish research council application from Onsala Space Observatory for funding a full LOFAR station was successful (6.8Mkr =720kEuro). ++ Site identified, needs ’remodelling’ of landscape. Have applied for planning permission for blasting etc should get permission by early November at latest. Manpower, Network Engineer (EXPReS), new PhD student, Interferometry software support position (with ALMA)

Science Interest Garrelt Mellema, EOR KSP – Stockholm John Conway, Extragalactic Survey KSP Local star-forming galaxies. Compact objects in nearby galaxies (SNe, SNR, AGN) links to proposed eMERLIN Legacy projects. Young radio galaxies (CSS/GPS) source statistics from MSSS. Göran Östlin, Nils Bergvall also potentially interested in surveys. Bo Thide, Solar and Space Weather KSP Other interests, Cluster sources, Transient stellar sources (Univ of Gothenburg). Recombination lines (John Black) Organising consortium meeting for late October in Stockholm

Onsala LOFAR site

OSO LOFAR – Site preparation Picture showing area after site preparation Rock blasted in 30deg el from the 70m d limit m3 filling needed (reuse stone from the blasting) About 1 hectare forest have to be cut down

OSO LOFAR – Final configuration