Pulsar Array Gravitational-wave Observatory
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Transcript of Pulsar Array Gravitational-wave Observatory
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Pulsar Array Gravitational-wave Observatory
Andrea N. LommenAssistant Professor of Physics and Astronomy
Head of Astronomy Program
Director of Grundy Observatory
Franklin and Marshall College
Lancaster, PA
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Collaborators
• David Nice, Bryn Mawr College • Ingrid Stairs, U. British Columbia• Don Backer, UC Berkeley• Paul Demorest, NRAO• Rob Ferdman, U. British Columbia,• Dick Manchester, ATNF• Bill Coles, UC San Diego• George Hobbs, ATNF• Rick Jenet, UT Brownsville
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20yrs of B1855+09
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PSR J1713+0747 over 12 years
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€
Ωgw ( f ) =2
3
π 2
H02f 2hc ( f )
2
fmin =1
dataspan
hc ( fmin ) ≤rms
dataspan
Ωgw ( f ) ≤rms2
dataspan4
From Jenet, Hobbs, van Straten, Manchester, Bailes, Verbiest, Edwards, Hotan, Sarkissian & Ord (2006)
Arecibo dominates by length of data set
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Figure courtesy of George Hobbs
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Some Possible Sources of Burst Radiation
• Formation of SMBH (Thorne and Braginski ‘76)
• Close encounters of massive objects (Kocsis 06)
• Highly eccentric SMBH binaries (Enoki and Nagashima ‘06)
• Cosmic Strings (Damour and Vilenkin ‘01)
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The shape of the GW response
Thanks Bill Coles
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Detection algorithm: Weighted sum of residuals
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So what can we detect?• 20 pulsars, 1 microsecond RMS, daily obs, we
would detect a 0.70 microsecond maximum response about 93% of the time. For a 2-week burst we calculate the corresponding characteristic strain:
Max response (us)
Characteristic strain (h)
Percent detected
0.7 3.3e-13 93
0.5 2.3e-13 40
0.3 1.4e-13 2
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Scaling that last slide
• Statistic scales as number of pulsars so e.g. measurable strains halve if number of pulsars doubles
• Response scales as burst length, so measurable strains halve if burst length doubles
• If 20 pulsars have 100 ns RMS, divide left two columns by 10
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Sensitivity to a 0.75 s 2-week burst, daily observing, 20 pulsars
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Sensitivity to a 0.75 s 2-week burst, daily observing, 20 pulsars
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Sensitivity to a 0.75 s 2-week burst, daily observing, 20 pulsars
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Sensitivity to a 0.75 s 2-week burst, daily observing, 20 pulsars + 3 more
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Wish-list
• Back to 20 observations per year• Wide-band multi-frequency
observations (800MHz + Lband + Sband)
• Clone of NRAO pulsar “dream” machine. 800 MHz coherent dedispersion with FPGAs
• Observing system stream-lined.
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Summary and Prospects
• Arecibo is needed for detection of GWs.• Arecibo is leading, and is poised to continue
to do so, but at one observing session every two months it will lose its edge.
• P-ALFA searches important for discovering new pulsars for the array.
• North American Pulsar Timing Array meeting next weekend
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Detectability of a Waveform
• “Recall”
€
R(t) =1
21+ cosμ( ) r+ t( )cos 2ψ( ) + r× t( )sin 2ψ( )[ ]
r+,× t( ) = r+,×e − r+,×
p
r+,×e = h+,×
e τ( )0
t
∫ dτ
r+,×p = h+,×
p τ −d
c1− cosμ( )
⎡ ⎣ ⎢
⎤ ⎦ ⎥
0
t
∫ dτ
(Jenet, Lommen, Larson and Wen 2004)