Pulsar population overview Dunc Lorimer (WVU) November 2, 2006 The observed sample Spin frequencies > 10 Hz - normal pulsars - recycled objects Current/future.

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Presentation transcript:

Pulsar population overview Dunc Lorimer (WVU) November 2, 2006 The observed sample Spin frequencies > 10 Hz - normal pulsars - recycled objects Current/future searches - Arecibo - GBT - SKA

The observed pulsar sample

How complete is the sample?

Pulsars with f > 10 Hz Over 200 currently known –Half of these are in globular clusters –Mostly recycled objects in binary systems –Some young, normal pulsars cf. Crab –Several double neutron star binaries A (Burgay et al. 2003) (Champion et al. 2004) (Faulkner et al. 2004)

f > 10 Hz: normal pulsars Several new PSR-SNR pairs –J in 3C58, P = 65.7 ms (Murray et al. 2002; Camilo et al. 2002) –J in G , P = 61.8 ms (Camilo et al. 2006) These are faint radio pulsars at distances of several kpc.

f > 10 Hz: normal pulsars Lorimer et al. (2006) Approximately 2.5% of all normal pulsars have f > 10 Hz

f > 10 Hz: globular clusters Record holder is Ter5ad with f=716 Hz (Hessels et al 2006) Population analysis of new sample required.

f > 10 Hz: Galactic disk

MSP population model Work in progress using Parkes surveys… –Current population has 20,000 MSPs –Predict ~900 MSPs with d < 3 kpc

Current and future surveys Arecibo - ALFA (1.4 GHz) Green Bank - Pband MHz

Current and future surveys Arecibo –P-ALFA survey –35 new PSRs Cordes et al. (2006) Green Bank –350 MHz survey –~dozen new PSRs

200 new MSPs expected!

Looking further ahead

A pulsar survey with SKA By 2020… ~complete sample >20,000 normal PSRs several thousand MSPs 10s of DNS binaries? PSR-BH binary? Meeting at CfA tomorrow All are welcome to attend