Refractive interstellar scintillation and millisecond pulsar timing

Details Refractive interstellar scintillation and millisecond pulsar timing Refractive interstellar scintillation and millisecond pulsar timing

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366l..33h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 366, Jan. 1, 1991, p. L33-L37. Research supported by Corning Glas

Statistics

Computation

7

Cosmology, Pulsars, Scintillation, Astronomical Spectroscopy, Gravitational Waves, Interstellar Matter, Power Spectra, Pulse Duration, Turbulence Effects

Scientific paper

Timing observations of the msec pulsar PSR 1937 + 21 now show significant LF noise. This noise is incompletely removed by a simple dispersion-correcting algorithm based on dual-frequency observations. A two-dimensional simulation of refractive interstellar scintillation propagation effects, with parameters appropriate to the pulsar timing experiment, is developed. These computations show good agreement with a power-law spectrum of interstellar turbulence. Moreover, a second roughly frequency-independent noise component is isolated from the data. This noise, with a very steep red spectrum, may be best explained as irregularities in the pulsar rotation or possibly as signature of a cosmological gravitational-wave background.

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