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

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 microJy (2 sigma) upper limit in the radio band.

arXiv comment6 pages, 1 figure. To be published in the proceedings of the conference "Isolated Neutron Stars: from the Interior to the Surface" (April 24-28, 2006, London, UK), eds. S. Zane, R. Turolla and D. Page

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Cited by in corpus (9)

• The McGill Magnetar Catalog
• Detailed high-energy characteristics of AXP 4U 0142+61 - Multi-year observations with INTEGRAL, RXTE, XMM-Newton and ASCA
• Broad-band study with Suzaku of the magnetar class
• Search for gamma-ray emission from magnetars with the Fermi Large Area Telescope
• Soft and Hard X-Ray Emissions from the Anomalous X-ray Pulsar 4U 0142+61 Observed with Suzaku
• Long-term X-ray changes in the emission from the anomalous X-ray pulsar 4U 0142+61
• Physical Properties of the AXP 4U 0142+61 from X-ray Spectral Analysis
• Constraining Radio Emission from Magnetars
• The featureless and non-variable optical spectral energy distribution of AXP 4U 0142+61