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

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

Sep 27, 2023 139 likes •274 views

The Pulsar programs at the Nanay radiotelescope G.Theureau LPCE-Orlans & Paris Observatory, France The Nanay site is 180 km South from Paris, What is Nanay ? in the middle of the Sologne forest Some of the largest single dish

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SLIDE 1

The Pulsar programs at the Nançay radiotelescope

G.Theureau LPCE-Orléans & Paris Observatory, France

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SLIDE 2

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 The Nançay site is 180 km South from Paris, in the middle of the Sologne forest

What is Nançay ?

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SLIDE 3

Nançay : a special design

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

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SLIDE 4

Pulsaroscope 1988-2004 (swept oscillator -- coherent) NBPP 1998-2004 (Navy Berkeley Pulsar Processor -- incoherent)

Dédisperseur BON 2003-...

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

Pulsar instrumentation

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SLIDE 5

Timing uncertainty

  • vs. instrumentation

a single observation with BON

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SLIDE 6

Two complex polarizations

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SLIDE 7

Timing accuracy

The TOA residuals for PSRB1937+21 are

  • btained with an

accuracy of ~170 ns

  • ver only a 30s

integration

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SLIDE 8

Nançay 1.4GHz

Daily observations of the magnetar J1809-1943

A dense time sampling

Follow-up of P-ALFA pulsar PSR1906+0746

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SLIDE 9
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SLIDE 10

~ 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)

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SLIDE 11

Lestrade Cognard Cognard Theureau Desvignes Spallicci Desuza Ferdman Corongiu

sweptLO NBPP BON

Lestrade Cognard Maitia Cognard Theureau Cognard Cognard (Lestrade) (Hamidouche)

NRLWashington UCBerkeley

Instrumentation and evolution of the number

  • f pulsars observed Nançay

Who ?

European Pulsar Timing Array

M.Kramer, A.Lyne (Jodrell) N.D'Amico, A.Possenti, M.Burgay (Cagliari) A.Jessner (Effelsberg) B.Stappers (Westerbork)

GLAST-Bordeaux Smith Dumora Guillemot Parent

EPTA GLAST HESS

Nançay-Orléans

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SLIDE 12

Next call for proposals at Nançay : deadline November 15

th

Inputs welcome !!!