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Proposal Identication No.: P1481 Date Received: 2000-Sep-30 20:41:33
Technical Page
Proposal Type: Long-term
General Category: Pulsars
Observation Category: Galactic
Total Time Requested: 605 Hours
Proposal Title: Probing the NanoHertz Gravitational Wave Background with a Pulsar Timing
Array
ABSTRACT:
Precision timing of an array of millisecond pulsars provides the only method for direct detection of gravitational
radiation at nanoHertz frequencies. Detection is possible owing to the fact that space-time between the pulsar
and the Earth is ` exed' by gravitational radiation, and periodic pulsar signals provide sensors similar to the
operation of laser interferometers. The stochastic background we seek to measure may be the relic of global
processes before the recombination epoch, or may result from the coalescence of Massive Black Holes following
galaxy mergers. Since the upgrade, we monitored monthly a number of millisecond pulsars at Arecibo for
gravitational radiation background measurement and other pulsar astrophysics. We have made good progress with
establishing a Pulsar Timing Array experiment and wish to continue toward our goal of a rms strain measurement
level of  10 15 at 10 nHz, an order of magnitude improvement on existing measurements.
Name Institution E-mail Phone Student
Donald C Backer University of Califor-
nia, Berkeley
dbacker@astro.berkeley.edu 510-642-5128 no
I want to do remote observing.
Instrument Setup
430 G L-wide 430 CH receiver S-low
Atmospheric Optical Instruments:
Description of Observer Equipment: Arecibo-Berkeley Pulsar Processor (ABPP)
BACSPIN
Princeton Mark IV recorder
Special Equipment or setup: Assistance with maintenance of ABPP/BACSPIN is
currently under development.
Maintenance of integrity of receivers and cable
paths is crucial for this long term experiment.
This includes GPS monitoring of time.
Development of ux and polarization calibration
through the pulsar backend is also critical.
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RFI Considerations
Frequency Ranges Planned
420-440
605-615
1200-1500
2250 2500
2