2011 Pulsar Search Collaboratory Data

Team LyneDelaney Jeanine Pigott

Elizabeth Leigh SchmitzMariah Francine GnegyZachary Filmore Ramey

Dana Marie DawleyThomas Eugene Hillenbrand

Team Mentor: Caitlin Joannah Ahrens

ObjectiveSearch through fifteen data sets to detect

possible pulsarsIdentify RFI sourcesIdentify noiseFollow up possible pulsars with observations

from GBT

ProcedureSearch through plots and differentiate

between RFI, noise, and possible pulsarsObserve FFT (double pulse) plots and single

pulse plots, Analyze patterns from the time domain,

frequency domain, and the dispersion measure plots

Compare follow up data from GBT with previous data

Noise Plot•Reduced chi-squared is less than 1•P(noise) < 1•No distinguishable signal from pulse profile•DM plot is not bell shaped

RFI Plot•Snake bite on frequency domain plot•DM Plot peaks at zero•No vertical bins on time domain plot

Single Pulse RFI Plot•All plots peak at a DM signal of zero•Possibly not at the right frequency to pick up other signals

Pulsar Candidates•Clear peaks in pulse profile•Clear vertical bins on time domain plot and frequency domain plots•P(noise) is near zero

Pulsar Candidates (cont)•Relatively small error bar•Clear and sharp peaks in pulse profile•Visible lines in time domain and sub-band plots•Bell-curved DM plot

Pulsar Candidates (cont)•Small error bar•Two clear distinguishable peaks on pulse profile•Visible vertical bins on time domain plot•DM plot has a clear distinct bell shape•Reduced chi-squared is 5.2•P(noise) ~ zero

Follow Up•Known pulsar in drift scan survey•Interrupted by RFI•DM plot has a peak at zero•Snake bites are apparent in frequency domain plot and it is white•Reduced chi-squared is 93•P(noise) ~ zero

DiscussionLack of sufficient follow up data from GBTUnable to draw conclusionsRemaining Questions:

Has there been any changes to J1736-0241 since the last follow up?