Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277l..53c&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. L53-L56. NSF-supported resea
Astronomy and Astrophysics
Astronomy
43
Interstellar Extinction, Pulsars, Pulsed Radiation, Radio Astronomy, Stellar Radiation, Time Measurement, Gravitational Waves, Magnetospheres, Multipath Transmission, Plasma Turbulence, Stellar Gravitation, Time Lag
Scientific paper
Measurements at four radio frequencies show to high accuracy that interstellar dispersion and scattering produce the only frequency-dependent time delays in pulse arrival times. The dispersion measure is DM = 71.0440 + or - 0.0002 pc per cu cm. All frequencies are emitted from the same altitude to within + or - 2 km, but the variation of pulse width with frequency proportional to f exp -1.5 at low frequencies implies beaming is strongly frequency dependent. The interpulse to main pulse separation (174 deg) appears to be independent of frequency. Dual-frequency monitoring should allow intrinsic timing activity or timing variations due to gravity wave backgrounds to be distinguished from changes in dispersion measure.
Cordes James M.
Stinebring Daniel R.
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