The Pulsar programs at the Nanay radiotelescope G.Theureau - PowerPoint PPT Presentation

The Pulsar programs at the Nançay radiotelescope G.Theureau LPCE-Orléans & Paris Observatory, France

The Nançay site is 180 km South from Paris, What is Nançay ? in the middle of the Sologne forest Some of the largest single dish radio telescopes: Arecibo ~200 m Green Bank 100 m Effelsberg 100 m Nançay ~ 94 m Jodrell bank 76 m Parkes 64 m (Cagliari) 64 m Nançay

Nançay : a special design Design Double Gregorian Focal system Receiver 200 x 35 m apperture ~ 94 m circ. two corrugated horns : 1.1 - 1.8 GHz 1.5 K / Jy at 1.4 GHz 83% of the sky down to δ = - 39° 1.7 - 3.5 Ghz Tsys = 35 K at 1.4 Ghz meridian-transit : ~ 1h tracking instantaneous bandwidth 400 MHz

Pulsaroscope 1988-2004 (swept oscillator -- coherent) NBPP 1998-2004 (Navy Berkeley Pulsar Processor -- incoherent) Pulsar instrumentation BON 2004-2008 (Berkeley-Orléans-Nançay -- coherent) ● 2 polars I,Q sampled at 128Ms/s, 8bits ● PFB : 32 * 4MHz channels + embeded linux ● 1 master + 77 slaves bi-proc Athlon 1.2GHz, ● Gigabit network (32GBs), Linux kernel 2.4.2 Dédisperseur BON 2003-...

Timing uncertainty vs. instrumentation a single observation with BON

Two complex polarizations

Timing accuracy The TOA residuals for PSRB1937+21 are obtained with an accuracy of ~170 ns over only a 30s integration

A dense time sampling Daily observations of the magnetar J1809-1943 Follow-up of P-ALFA pulsar PSR1906+0746 Nançay 1.4GHz

~ 43 % of telescope time Two main scientific programs ● Radio support to high energy observations GLAST, HESS, AGILE, XMM-Newton, INTEGRAL - provide ephemerides to phase the rare gamma photons - understand the emission mechanisms follow-up of ~140 pulsars (mainly 'young and noisy') ● A multi-scale gravitational wave program - Pulsar Timing Array --> cosmological background - binary pulsars, double NS - glitching pulsars dense observations of ~40 pulsars (mainly MS stable pulsars)

GLAST-Bordeaux E uropean P ulsar T iming A rray Smith M.Kramer, A.Lyne (Jodrell) Dumora Who ? N.D'Amico, A.Possenti, M.Burgay (Cagliari) Guillemot Parent A.Jessner (Effelsberg) B.Stappers (Westerbork) EPTA Cognard Theureau GLAST Desvignes HESS Spallicci Nançay-Orléans Desuza Lestrade Cognard Lestrade Cognard (Lestrade) Cognard Ferdman Cognard Maitia Cognard (Hamidouche) Theureau Corongiu BON UCBerkeley Instrumentation and evolution of the number of pulsars observed Nançay NRLWashington NBPP sweptLO

Next call for proposals at Nançay : th deadline November 15 Inputs welcome !!!