Temporal variation of pulsar dispersion measure
نویسندگان
چکیده
منابع مشابه
Dispersion Measure Variations and their Effect on Precision Pulsar Timing
We present an analysis of the variations seen in the dispersion measures (DMs) of 20 millisecond pulsars observed as part of the Parkes Pulsar Timing Array project. We carry out a statistically rigorous structure function analysis for each pulsar and show that the variations seen for most pulsars are consistent with those expected for an interstellar medium characterised by a Kolmogorov turbule...
متن کاملDispersion measure variations observed in the direction of the millisecond pulsar PSRB1821-24
High-precision timing observations of the millisecond pulsar PSR B1821-24 have been conducted at the Nançay radiotelescope between 1.37 GHz and 1.7 GHz since January 22, 1992 until January 10, 1996. This dense and precise multifrequency timing series has allowed secular variations of the dispersion measure as high as 0.005 pc.cm−3/year in the direction of this pulsar to be determined. The index...
متن کاملWave dispersion in gyrotropic relativistic pulsar plasmas.
Wave dispersion in a gyrotropic relativistic pulsar plasma is discussed. A pulsar plasma in general contains electrons, positrons, and possibly ions. Although electron-positron pairs are dominant in number density, charge neutrality is generally not satisfied and the gyrotropic terms need to be considered. These gyrotropic terms can lead to elliptical polarization that may be relevant for the o...
متن کاملTemporal dispersion of a spectrometer.
The temporal dispersion of an optical spectrometer has been characterized for a variety of conditions related to optical diagnostics to be fielded at the National Ignition Facility (e.g., full-aperture backscatter station, Thomson scattering). Significant time smear is introduced into these systems by the path length difference through the spectrometer. The temporal resolution is shown to depen...
متن کاملWave dispersion near cyclotron resonance in pulsar plasmas.
In a standard pulsar model, the radio emission is produced in the relativistic, strongly magnetized electron-positron plasma in the polar-cap region of the magnetosphere. Waves are generated well below the cyclotron frequency and must propagate through the cyclotron resonance region where they are affected by the resonance. Wave dispersion near the cyclotron resonance is discussed in the formal...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1995
ISSN: 0004-637X,1538-4357
DOI: 10.1086/175521