Logo del repository
  1. Home
 
Opzioni

Fermi Large Area Telescope Observations Of The Vela Pulsar

A. A. Abdo
•
M. Ackermann
•
W. B. Atwood
altro
M. Ziegler
2009
  • journal article

Periodico
THE ASTROPHYSICAL JOURNAL
Abstract
The Vela pulsar is the brightest persistent source in the GeV sky and thus is the traditional first target for new gamma-ray observatories. We report here on initial Fermi Large Area Telescope observations during verification phase pointed exposure and early sky survey scanning. We have used the Vela signal to verify Fermi timing and angular resolution. The high-quality pulse profile, with some 32,400 pulsed photons at E >= 0.03 GeV, shows new features, including pulse structure as fine as 0.3 ms and a distinct third peak, which shifts in phase with energy. We examine the high-energy behavior of the pulsed emission; initial spectra suggest a phase-averaged power-law index of Gamma = 1.51(-0.04)(+0.05) with an exponential cutoff at E-c = 2.9 +/- 0.1 GeV. Spectral fits with generalized cutoffs of the form e(-(E/Ec)b) require b <= 1, which is inconsistent with magnetic pair attenuation, and thus favor outer-magnetosphere emission models. Finally, we report on upper limits to any unpulsed component, as might be associated with a surrounding pulsar wind nebula.
DOI
10.1088/0004-637X/696/2/1084
WOS
WOS:000265762700003
Archivio
http://hdl.handle.net/11368/2338271
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84863115445
Diritti
metadata only access
Soggetti
  • High Energy Gamma-ray...

  • Fermi satellite

  • Pulsars

Web of Science© citazioni
129
Data di acquisizione
Mar 23, 2024
Visualizzazioni
1
Data di acquisizione
Apr 19, 2024
Vedi dettagli
google-scholar
Get Involved!
  • Source Code
  • Documentation
  • Slack Channel
Make it your own

DSpace-CRIS can be extensively configured to meet your needs. Decide which information need to be collected and available with fine-grained security. Start updating the theme to match your nstitution's web identity.

Need professional help?

The original creators of DSpace-CRIS at 4Science can take your project to the next level, get in touch!

Realizzato con Software DSpace-CRIS - Estensione mantenuta e ottimizzata da 4Science

  • Impostazioni dei cookie
  • Informativa sulla privacy
  • Accordo con l'utente finale
  • Invia il tuo Feedback