Dynamic Power Spectra: Searching for Compact Binary Pulsars

Details Dynamic Power Spectra: Searching for Compact Binary Pulsars Dynamic Power Spectra: Searching for Compact Binary Pulsars

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343613p&link_type=abstract

American Astronomical Society, AAS Meeting #213, #436.13; Bulletin of the American Astronomical Society, Vol. 41, p.308

Astronomy and Astrophysics

Astronomy

Scientific paper

Some of the most scientifically useful pulsars are those in compact binary orbits (Porb < 4-5 hours), which are often found in the dense stellar environments of globular clusters. Unfortunately, strong Doppler accelerations make finding these pulsars very difficult. One of the more promising techniques to find these objects utilizes Dynamic Power Spectra (DPS), which are sensitive to binary pulsars when the observation length is comparable to the orbital period. A DPS consists of Fourier powers spanning across a large data plane of Fourier frequency and time. A pulsar appears in the DPS as a curve tracing out the Doppler shifted spin frequency as a function of observation time across the plane. We have improved the method by which we create DPS by including a new harmonic summing routine and a constant frequency derivative acceleration search with interbinning in each DPS segment. We have developed a beta version of a DPS search algorithm that is tuned to find pulsars when the orbital period is approximately equal to the observation duration. We have many terabytes of globular cluster data from the Green Bank Telescope which likely contain unknown compact pulsar binaries, many of which are thought to be sought-after millisecond pulsars. A thorough search of this data in ongoing and if new pulsars are found we will then determine "instant" timing solutions using the archival data. Funding for this presentation is made possible by the NSF REU Program, AUI, the NRAO, and Columbia University.

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