T. W. Cole’s research while affiliated with University of Cambridge and other places

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Publications (4)

Long Term Variations of Pulsar Intensities
  • Article

March 1970

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6 Reads

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49 Citations

Nature

T W Cole

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H K Hesse

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PULSAR intensity variations may be divided roughly into three classes. There are rapid variations on a time-scale of seconds to minutes which occur simultaneously over a wide range of frequency and must therefore be intrinsic to the source1. On a somewhat longer time-scale there are variations typically over a few minutes to a few hours which correlate only over limited bandwidths. There is strong evidence that they are caused by irregular diffraction in the interstellar medium2,3. Finally, there are variations on a time-scale of days to months4 about which little is known because extended regular observations are required. In this report we present some new results obtained during timing observations carried out on a routine basis over 11 months.

Citations (4)

... In this work, we focus on PSR B0329+54 (discovered by Cole & Pilkington 1968), which is one of the brightest (∼1.5 Jy at 400 MHz; ATNF pulsar catalog 8 ; Manchester et al. 2005) and the closest pulsars (∼1.2 kpc; Yao et al. 2019). It has been reported to show frequencydependent DMs by Ahuja et al. (2007). ...

Reference:

Retracing the Cold Plasma Dispersion Law in Pulsar B0329+54: New Insights into Frequency-Dependent Dispersion Measures
Search for Pulsating Radio Sources in the Declination Range + 44° < δ < + 90°
  • Citing Article

  • August 1968

Nature

T. W. Cole

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J. D. H. Pilkington

... The spin-down of pulsars is one of the most prominent features of their rotation (Davies et al. 1969, Cole 1969. Considering the magnetic field of a neutron star in a vacuum to have dipolar configuration and assuming that the magnetic axis is misaligned with the rotation axis, it must radiate and lose energy, which contributes to the observed slow down (Gunn & Ostriker 1969). ...

Reference:

Timing of young radio pulsars II. Braking indices and their interpretation
Pulsar slowdown rates for CP 0328 and HP 1506
  • Citing Article

  • July 1969

Nature

T. W. Cole

... The longer time-scales involved make studies of refractive scintillation more challenging and involve multiyear campaigns. The long-term variations of pulsar flux densities were first studied by Cole, Hesse & Page ( 1970 ) with the theoretical frame work being de veloped by Scheuer ( 1968 ), Rickett, Coles & Bourgois ( 1984 ), and Cordes et al. ( 1986 ). In a 43 consecutive day mean flux density campaign on 25 pulsars with the NRAO 91 m telescope, Stinebring & Condon ( 1990 ) demonstrated for the first time that potentially all of the non-nulling 'normal' slow pulsars with high dispersion measures had remarkably consistent mean flux densities and that their intrinsic luminosities are probably constant. ...

Reference:

Flux density monitoring of 89 millisecond pulsars with MeerKAT
Long Term Variations of Pulsar Intensities
  • Citing Article

  • March 1970

Nature

T W Cole

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H K Hesse

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