Dispersion measure variations observed in the direction of the millisecond pulsar PSR B1821-24. - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 1997

Dispersion measure variations observed in the direction of the millisecond pulsar PSR B1821-24.

(1) , (2, 3)
1
2
3

Abstract

High-precision timing observations of the millisecond pulsar PSR B1821-24 have been conducted at the Nancay radiotelescope between 1.37GHz and 1.7GHz since January 22, 1992 until January 10, 1996. This dense and precise multi-frequency timing series has allowed secular variations of the dispersion measure as high as 0.005pc/cm^3^/year in the direction of this pulsar to be determined. The index β of the power-law spatial spectrum of the electron density fluctuations has been determined for the first time in the direction of this pulsar and is 3.727+/-0.211, a result consistent with a Kolmogorov turbulent medium. The diffractive time scale τ_d_ is also determined to be 50+/-_ 40_^183^ s and is relatively consistent with the determination based on the space velocity of PSR B1821-24. We also provide a new proper motion for this pulsar for which the declination component is for the first time inconsistent with zero.
Fichier principal
Vignette du fichier
1997A+A___323__211C.pdf (193.11 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

insu-02612447 , version 1 (19-05-2020)

Identifiers

Cite

Ismaël Cognard, Jean-Francois Lestrade. Dispersion measure variations observed in the direction of the millisecond pulsar PSR B1821-24.. Astronomy and Astrophysics - A&A, 1997, 323 (1), pp.211-216. ⟨insu-02612447⟩
40 View
23 Download

Share

Gmail Facebook Twitter LinkedIn More