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The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays

  • P. R. den HartogEmail author
  • L. Kuiper
  • W. Hermsen
  • N. Rea
  • M. Durant
  • B. Stappers
  • V. M. Kaspi
  • R. Dib
Conference paper

Abstract

For the first time a quasi-simultaneous multi-wavelength campaign has been performed on an Anomalous X-ray Pulsar from the radio to the hard X-ray band. 4U 0142+61 was an INTEGRAL target for 1 Ms in July 2005. During these observations it was also observed in the X-ray band with Swift and RXTE, in the optical and NIR with Gemini North and in the radio with the WSRT. In this paper we present the source-energy distribution. The spectral results obtained in the individual wave bands do not connect smoothly; apparently components of different origin contribute to the total spectrum. Remarkable is that the INTEGRAL hard X-ray spectrum (power-law index 0.79±0.10) is now measured up to an energy of ∼230 keV with no indication of a spectral break. Extrapolation of the INTEGRAL power-law spectrum to lower energies passes orders of magnitude underneath the NIR and optical fluxes, as well as the low ∼30 μJy (2σ) upper limit in the radio band.

Keywords

Neutron stars Magnetars Anomalous X-ray pulsars 

PACS

97.60.Jd 97.60.Gb 95.85.Pw 95.85.Nv 95.85.Kr 95.85.Jq 95.85.Bh 

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Copyright information

© Springer 2007

Authors and Affiliations

  • P. R. den Hartog
    • 1
    Email author
  • L. Kuiper
    • 1
  • W. Hermsen
    • 1
    • 2
  • N. Rea
    • 1
  • M. Durant
    • 3
  • B. Stappers
    • 2
    • 4
  • V. M. Kaspi
    • 5
  • R. Dib
    • 5
  1. 1.SRON Netherlands Institute for Space ResearchUtrechtThe Netherlands
  2. 2.Astronomical InstituteUniversity of AmsterdamAmsterdamThe Netherlands
  3. 3.Department of Astronomy & AstrophysicsUniversity of TorontoTorontoCanada
  4. 4.ASTRON, The Netherlands Foundation for Research in AstronomyDwingelooThe Netherlands
  5. 5.Physics DepartmentMcGill UniversityMontrealCanada

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