• P. M. McCulloch

      Articles written in Journal of Astrophysics and Astronomy

    • Application of ‘CLEAN’ in the power spectral analysis of non-uniformly sampled pulsar timing data

      A. A. Deshpande F. D’Alessandro P. M. McCulloch

      More Details Abstract Fulltext PDF

      Spectral analysis of the residual pulsearrival times of pulsars is a useful tool in understanding the nature of the underlying processes that may be responsible for the timing noise observed from pulsars. Power spectra of pulsar timing residuals may be described by one or a combination of powerlaws. As these spectra are expected to be very steep, it is important to ensure a high dynamic range in the estimation of the spectrum. This is difficult in practice since one is, in general, dealing with timing measurements made at unevenly placed epochs. In this paper, we present a technique based on, ‘CLEAN’ to obtain high dynamic range spectra from unevenly sampled data. We compare the performance of this technique with other techniques including some that were used earlier for estimation of power spectra of pulsar timing residuals.

    • Power spectrum analysis of the timing noise in 18 southern pulsars

      F. D’Alessandro A. A. Deshpande P. M. McCulloch

      More Details Abstract Fulltext PDF

      Power spectra of the timing noise observed in 18 southern pulsars have been derived using a novel technique, based on the CLEAN algorithm. Most of the spectra are well described by a single- or double-component power-law model. Some of these spectra can be interpreted in the context of one or more of the current timing noise models. The results combined with those obtained from the time-domain analyses of the timing activity in these pulsars are used to assess the viability of the various theoretical models of pulsar timing noise.

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      Posted on January 27, 2016

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