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Proposal Identification No.:

P2445

Date Received:

2008-Oct-01 00:18:28

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: Regular Pulsars Galactic 50 Hours 2:30

Assessing the Impact of the ISM in Precision Pulsar Timing: A Case Study of

PSR J1713+0747
ABSTRACT:
The detection of gravitational waves using a pulsar timing array requires the ability to determine pulsar times-of-arrival (TOAs) to unprecedented timing precision. One unexplored source of uncertainty in pulsar TOAs is associated with the propagation of the radio emission through the warm electrons of the interstellar medium (ISM). As a pilot pro ject, we request 50 hours to conduct a systematic study of propagation effects and timing for the millisecond pulsar J1713+0747. We will use established techniques to characterize the ISM in the direction of this pulsar. To assess the strength of the effects, we will correlate the properties of the scattering with simultaneously-obtained TOAs. This study is the first part of a larger program to identify and mitigate propagation effects in pulsar TOAs.

Name Ryan M Shannon

Institution Cornell University

E-mail ryans@astro.cornell.edu

Phone 607 255 6420

Student G

Remote Observing Request

X

Observer will travel to AO Remote Observing In Absentia (instructions to operator)

Instrument Setup
430 G L-wide S-low 327

Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations
1


Frequency Ranges Planned
302-352 422-442 1150-1750 1800-3100 This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz.. This proposal requires coordination with GPS L3 at 1381 MHz.

2