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Proposal Identication No.: P1877 Date Received: 2004-Oct-01 23:28:48
Technical Page
Proposal Type: Regular
General Category: Pulsars
Observation Category:
Total Time Requested: 9 Hours
Proposal Title: ow-frequency millisecond pulsar polarimetry
ABSTRACT:
We request 9 hrs of observing time to investigate the emission properties (spectral behavior, intensity-prole
complexity and polarization) of a small sample of millisecond pulsars (MSPs) at 327 MHz. Results from our
high-frequency polarimetric study indicated that the properties of the MSP pulse components do not t easily into
successful classication schemes proposed for slower pulsars. A critical role to the formulation of classication
schemes is played by a wide frequency coverage of the emission properties. The newly commissioned receiver in
combination with the large collecting area of Arecibo, provides a unique instrument to study some MSPs at low
frequencies. Our expectation is that since pulsars in general are stronger sources at lower frequencies and the
radioemission inherently strongly polarized, the polarization properties will appear more pronounced allowing
higher quality data to be obtained. In particular the polarization position-angle (PPA) swing might be better
dened and across a wider range of longitudes at lower frequencies. Knowledge of the PPA can potentially lead to
reliable estimates of the viewing geometry of MSPs (magnetic inclination). Such data can then be used to search
for a tendency of the magnetic axis to align with the rotation axis. Also, well dened PPA swings can be used to
estimate the location of the emission region in the MSP magneto-spheres
Name Institution E-mail Phone Student
Kiriaki Xilouris University of Vir-
ginia
kx8u@virginia.edu 434 924-7470 no
Service Observing Request Remot e Observing Request
None X No
All of the observing run. Maybe
X Part of the observing run. Yes
Queue Observing
Instrument Setup
327
Atmospheric Observation Instruments:
1

Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
312-342MHz
2