Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343611e&link_type=abstract
American Astronomical Society, AAS Meeting #213, #436.11; Bulletin of the American Astronomical Society, Vol. 41, p.308
Astronomy and Astrophysics
Astronomy
Scientific paper
MIT/Lincoln Labs in Massachusetts are currently using the 140' telescope in Green Bank, WV to study the Earth's ionoshpere. However, they are not operating the telescope around the clock, so astronomers at WVU are working with the NRAO to develop a new pulsar data acquisition system to be used when there is telescope time. For eleven weeks in the summer of 2008, we worked to develop and test this system. In mid-June, we wrote a datataking control gui for the Parkes Spectrometer (Parspec), the new pulsar backend for the telescope. We later hooked up an artificial pulsar machine to the spectrometer to try and narrow down a problem we were having in our post-folded data. Though the results of the test seem to show that the cause of the problem is not occurring in the spectrometer, further investigation points to the most likely cause being an effect from the signal digitization process. Observations of known pulsars were also carried out over the course of the summer. Once enough observations had been made, we compared the measured versus expected S/N. Our results from this comparison were likely affected due to an overall reduction in signal caused by the digitization process. Eight pulsars, including two millisecond pulsars, were successfully timed suggesting that the Parspec machine is time-tagging the data in a consistent manner. Scintillation observations were also made of the known pulsar B0329+54 in an attempt to measure the pulsar's transverse speed. Because of a problem in calculating the auto-correlation function, rough estimates of the diffractive parameters had to be made. This may have been due to less-than-ideal observation lengths and center frequencies, and radio frequency interference. Because of this, the calculated values for the transverse speed were higher than previously stated values.
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