Fermi detection of the pulsar wind nebula HESS J1640-465

P. Slane, D. Castro, S. Funk, Y. Uchiyama, A. Lemiere, J. D. Gelfand, M. Lemoine-Goumard

Research output: Contribution to journalArticlepeer-review


We present observations of HESS J1640-465 with the Fermi-Large Area Telescope. The source is detected with high confidence as an emitter of high-energy gamma-rays. The spectrum lacks any evidence for the characteristic cutoff associated with emission from pulsars, indicating that the emission arises primarily from the pulsar wind nebula (PWN). Broadband modeling implies an evolved nebula with a low magnetic field resulting in a high γ-ray to X-ray flux ratio. The Fermi emission exceeds predictions of the broadband model, and has a steeper spectrum, possibly resulting from a distinct excess of low energy electrons similar to what is inferred for both the Vela X and Crab PWNe.

Original languageEnglish (US)
Pages (from-to)266-271
Number of pages6
JournalAstrophysical Journal
Issue number1
StatePublished - Sep 1 2010


  • ISM: supernova remnants
  • Ism: individual objects (HESS J1640-465, FGL J1640.8-4634, 3EG J1639-4702, G338.3-0.0)
  • Pulsars: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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