Titre du document

Arrival-time analysis for a millisecond pulsar

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Nom du Corpus

AstroConcepts

Auteur(s)
  • Roger Blandford 1
  • Ramesh Narayan 1
  • Roger W. Romani 1
Affiliation(s)
  • Theoretical Astrophysics, California Institute of Technology, 91125, Pasadena, CA, USA
Résumé

Arrival times from a fast, quiet pulsar can be used to obtain accurate determinations of pulsar parameters. In the case of the millisecond pulsar, PSR 1937 + 214, the remarkably small rms residual to the timing fit indicates that precise measurements of position, proper motion and perhaps even trigonometric parallax will be possible (Backer 1984). The variances in these parameters, however, will depend strongly on the nature of the underlying noise spectrum. We demonstrate that for very red spectrai.e. those dominated by low-frequency noise, the uncertainties can be larger than the present estimates (based on a white-noise model) and can even grow with the observation period. The possibility of improved parameter estimation through prewhitening’ the data and the application of these results to other pulsar observations are briefly discussed. The post-fit rms residual of PSR 1937 + 214 may be used to limit the energy density of a gravitational radiation background at periods of a few months to years. However, fitting the pulsar position and pulse-emission times filters out significant amounts of residual power, especially for observation periods of less than three years. Consequently the present upper bound on the energy density of gravitational waves ?g <3 × 10-4 R ?s 2 , though already more stringent than any other available, is not as restrictive as had been previously estimated. The present limit is insufficient to exclude scenarios which use primordial cosmic strings for galaxy formation, but should improve rapidly with time.

Langue(s) du document
Anglais
Année de publication
1984
Revue

Journal of Astrophysics and Astronomy

Éditeur
Springer (journals)
Type de publication
journal
Type de document
research-article
Présence de XML structuré
Non
Version de PDF
1.3
Score de qualité du texte
9.916
Nom du concept
  • Asteroseismology
Mots-clés d’auteur
  • millisecond pulsar
  • arrival times
  • gravitational background radiation
Catégories Science-Metrix
  • 1 - natural sciences ; 2 - physics & astronomy ; 3 - astronomy & astrophysics
Catégories Inist
  • 1 - sciences appliquees, technologies et medecines ; 2 - sciences biologiques et medicales ; 3 - sciences biologiques fondamentales et appliquees. psychologie ; 4 - vertebres: anatomie et physiologie, organisme dans son ensemble ou etude de plusieurs organes ou systemes
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Space and Planetary Science
  • 1 - Physical Sciences ; 2 - Physics and Astronomy ; 3 - Astronomy and Astrophysics
Catégories WoS
  • 1 - science ; 2 - astronomy & astrophysics
Identifiant ISTEX
A3B5BA001091F831A4F52FA46F794663F39966E3
ark:/67375/1BB-X1PD04NF-Z
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