Spectral Analysis of Timing Noise in NANOGrav Pulsars

Details Spectral Analysis of Timing Noise in NANOGrav Pulsars Spectral Analysis of Timing Noise in NANOGrav Pulsars

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011yera.confe..36p&link_type=abstract

The 41st Young European Radio Astronomers Conference, held at University of Manchester/Jodrell Bank Observatory, 18-20 July 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The NANOGrav collaboration seeks to detect gravitational waves from distant supermassive black hole sources using a pulsar timing array. In order to search for gravitational waves, it is necessary to have a good characterization of the timing noise for each pulsar of the pulsar timing array. Red noise is common in millisecond pulsars, and we need to quantify how much red noise is present for each pulsar. This can be done by looking at the power spectra of the pulsar timing residuals. However because the pulsar data are non-uniformly sampled, one cannot simply do a Fourier analysis. Also, commonly used least-square fitting methods such as the Lomb-Scargle analysis are not adequate for steep red spectra. Instead, we compute the power spectra of NANOGrav pulsar timing residuals using the Cholesky transformation, which eliminates spectral leakage. This is done with the help of the TEMPO2 "SpectralModel" plugin developed by William Coles and George Hobbs.

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