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

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dc.creatorHartog, P. R. den
dc.creatorKuiper, L.
dc.creatorHermsen, W.
dc.creatorRea, N.
dc.creatorDurant, M.
dc.creatorStappers, B.
dc.creatorKaspi, V. M.
dc.creatorDib, R.
dc.date2006-11-06
dc.date.accessioned2026-07-07T10:40:46Z
dc.date.available2026-07-07T10:40:46Z
dc.descriptionFor 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.
dc.description6 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
dc.identifierhttps://arxiv.org/abs/astro-ph/0611175
dc.identifierhttp://arxiv.org/abs/astro-ph/0611175
dc.identifierAstrophys.SpaceSci.308:647-653,2007
dc.identifierdoi:10.1007/s10509-007-9367-1
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181430
dc.subjectAstrophysics
dc.titleThe first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays
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