2010 Glitch in Vela Pulsar Sarah Buchner SKA Bursary conference Dec 2010.
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Transcript of 2010 Glitch in Vela Pulsar Sarah Buchner SKA Bursary conference Dec 2010.
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2010 Glitch in Vela Pulsar
Sarah BuchnerSKA Bursary conference
Dec 2010
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Observing Vela with XDM 2
Neutron Stars and Pulsars
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Observing Vela with XDM 3
Pulsar Glitches
– Very good clock but …– Sudden increase in frequency
or “spin-up”– Frequency increases by few
parts per million– In energy terms
• earthquake of 17 on Richter scale
• surface of the earth moves by 15 m.
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Observing Vela with XDM 4
Vela Pulsar
• PSR 0833-45• Vela supernova remnant• About 10 000 years old• P = 0.089 s = 11.2 Hz
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Observing Vela with XDM 5
Vela Glitches
• Vela glitches
– Change in– Recovery contains exponential scales– 16 large glitches since 1969– Glitches every 1040 +- 326 days
69 1010
210
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Observing Vela with XDM 6
Vela Glitches from HartRAO
• The Vela Pulsar is observed three or more times daily on most days from 1985-2008 using the HartRAO 26m antenna.
• Observations made at either S or L-band.
• Online glitch detection – if a glitch is detected then continuous observing begins to catch exponential recoveries.
• 10 large glitches observed
710
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Observing Vela with XDM 7
Vela Glitches From HartRAO
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Observing Vela with XDM 8
HartRAO bearing failure
• In October 2008 HartRAO 26m south polar bearing failed
• Started observing Vela with 15m XDM at HartRAO
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Observing Vela with XDM 9
XDM observations
• 26m pulsar timer was single channel pulsar timer. Produced a folded profile for each 55s observation
• On XDM multi-channel iBob• Can access single pulse
data
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Observing Vela with XDM 10
• Began observing Vela with XDM for 14.7 hours per day
• First prize: Catch a glitch “in the act”
• Second Prize: Parameterize the recovery
• Free gift: – Pulsar timing provides exacting test of
polarization and timing of XDM.– Soak test – continuous observing
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Observing Vela with XDM 11
XDM and HartRAO
• Use XDM to observe continuously (15 hour per day)
• Use HartRAO 26m to make transit observations
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Observing Vela with XDM 12
Waiting for Glitch
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Observing Vela with XDM 13
Observing Vela
• 22 July 2010 26m was repaired and begun normal observing once again
• Observed Vela approximately once hourly
-160.000
-159.500
-159.000
-158.500
-158.000
-157.500
-157.000
-156.500
-156.000
-155.500
-155.000
45000 46000 47000 48000 49000 50000 51000 52000 53000 54000 55000
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Observing Vela with XDM 14
10 days after 26m repaired…
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Observing Vela with XDM 15
Glitch Parameters
• Glitch epoch– MJD 55408.802
• Vela was below horizon at the time
• Last pre-glitch observation– 1.9 hour before glitch
• First post-glitch observation– 7.4 hours after glitch
• Glitch size
91.1
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Observing Vela with XDM 16
Issued ATel
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Observing Vela with XDM 17
FERMI follow-up
• FERMI did not detect any increase of gamma-ray flux associated with the glitch
• FERMI timing detected the timing glitch – epoch not well constrained
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Observing Vela with XDM 18
Constraining Glitch Epoch
• Regular observing allows glitch epoch to be constrained
• 2006 Glitch observed with 26m• Glitch occurred during a LIGO
science run• First direct search for grav
waves assoc with glitch• No grav wave seen
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Observing Vela with XDM 19
Post-glitch Observations
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Observing Vela with XDM 20
Determine nudot values
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Observing Vela with XDM 21
XDM data
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Observing Vela with XDM 22
Rotation Frequency
2010 Glitch
-5
0
5
10
15
20
25
55380 55400 55420 55440 55460 55480 55500 55520 55540
MJD
nu
* 1
E6 91.1
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Observing Vela with XDM 23
Nu dot from XDM
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Observing Vela with XDM 24
26 m data
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Observing Vela with XDM 25
Spin-down
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Observing Vela with XDM 26
The Standard Vela Glitch
3
1i
t
idgidet
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Observing Vela with XDM 27
Transients for Glitches
5 d50 d5d5d
0.5d0.5d
50d50d
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Observing Vela with XDM 28
Comparison with other Glitches
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Observing Vela with XDM 29
Comparison
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Observing Vela with XDM 30
Underlying Physics?
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Observing Vela with XDM 31
Neutron Star
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Observing Vela with XDM 32
Superfluid Rotation
• Core of neutron star is superfluid
• Rotates by means of array of quantised vortices
• For superfluid to slow down vortex lines must move outward
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Observing Vela with XDM 33
Vortices in inner crust
• In inner crust vortices may pin to nuclei
• This region of superfluid is then unable to spin-down at same rate as crust
• Differential rotation develops
• At glitch vortices unpin and angular momentum is transferred from crustal superfluid to crust causing the spin-up
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Observing Vela with XDM 34
Two-component model
intextcc NNI
)(I
N CSCint
)(I
NI CSCCC
)(I
I CSCSS
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Observing Vela with XDM 35
Alpar Vortex Creep Model
• Coupling between superfluid and the crust is a function of the lag between the velocities
• At the time of the glitch – the crust spins up– The lag decreases– Hence the coupling
decreases– Superfluid “decouples”– Torque acting on smaller I
so spin-down increases– Recovery as region of
superfluid recouples
)(I
N CSCint
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Observing Vela with XDM 36
Non-linear coupling
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Observing Vela with XDM 37
Alpar Vortex Creep Model
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Observing Vela with XDM 38
But …
• Not all glitches are the same
• HartRAO archive data – 1994 double glitch
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Observing Vela with XDM 39
Overlaid Glitches with 1994
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Observing Vela with XDM 40
• 1994 glitch does not show transients• Regions do not decouple?
– Yet lag between superfluid and crust must change
• Different mechanism?• Is the model correct?
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Observing Vela with XDM 41
Pulse Shape Changes
• Recent paper by Weltevrede et al suggests glitch induced magnetospheric changes
• Look for pulse shape changes
• Look for increase of single pulses
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Observing Vela with XDM 42
Conclusion
• Observing Vela with XDM• First prize: Catch a glitch “in the act”
– Vela was below horizon
• Second Prize: Parameterize the recovery– 14.7 hours of observing enabled 0.5d time scale to be
observed
• Free gift: – Pulsar timing provides exacting test of polarization and
timing of XDM.– Soak test – continuous observing
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Observing Vela with XDM 43
Conclusion
• Work continues on modelling post-glitch recovery• Can recovery be modelled by 3 distinct
exponentials?• What is the physical reason for this?
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Observing Vela with XDM 44
Thanks
KAT teamKAT teamHartRAO staffHartRAO staff
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Observing Vela with XDM 45
Questions / Thoughts?
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Observing Vela with XDM 46
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Observing Vela with XDM 47
Questions
• How fast does the crust spin-up?
• What is the recovery?– Interior of neutron star
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Observing Vela with XDM 48
Dedispersion and folding
DBE Dedisperse Fold Find TOA
BarycentreFind residuals
clock DM P
Std Profile
Pls position
Timestamp
Obs x,y,z
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Observing Vela with XDM 49
Arrival Times (TOA)
53075.871601404853076.606809902953076.631509316253076.635258953453076.639008589753076.745305551253076.772805320553076.814437082853076.8440091993
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Observing Vela with XDM 50
1st order - frequency
‘early’
‘late’
Observed - Predicted
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Observing Vela with XDM 51
2nd order
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Observing Vela with XDM 52
2nd order
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Observing Vela with XDM 53
Residuals
32.04 us
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Observing Vela with XDM 54
12 m @ Parkes
50.66 us
Hobbs et al, 20090907.4847
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Observing Vela with XDM 55
Residuals
32.04 us
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Observing Vela with XDM 56
XDM prototype at HartRAO
Kitty
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Observing Vela with XDM 57
KAT-7
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Observing Vela with XDM 58
KAT -> meerKAT
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Observing Vela with XDM 59
meerKAT
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Observing Vela with XDM 60
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Observing Vela with XDM 61
Neutron Stars and Pulsars
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Observing Vela with XDM 62
Observing Vela with XDM
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Observing Vela with XDM 63
Waiting for Vela to glitch
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Observing Vela with XDM 64
Storm clouds over HartRAO
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Observing Vela with XDM 65
XDM Observations
• Observing Vela with XDM• First prize: Catch a glitch “in the act”
• Second Prize: Parameterize the recovery
• Free gift: – Pulsar timing provides exacting test of polarization and
timing of XDM.– Soak test – continous observing
![Page 66: 2010 Glitch in Vela Pulsar Sarah Buchner SKA Bursary conference Dec 2010.](https://reader036.fdocuments.in/reader036/viewer/2022062423/56649cad5503460f9496feb6/html5/thumbnails/66.jpg)
Observing Vela with XDM 66
Determine Glitch Epoch