2006/11/06 by P. R. den Hartog, L. Kuiper, W. Hermsen +5
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Cosmology #Earth Systems and Cosmic Evolution #Electromagnetic spectrum #Extrapolation #Limit (mathematics) #Neutron star #Pulsar #Radio spectrum #Radio wave #Spectral index #Spectral line #astro-ph
paper · pdf · doi:10.1007/s10509-007-9367-1
published as Astrophys.SpaceSci.308:647-653,2007 · 6 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
arxiv created 2006/11/06 · openalex publication_date 2007/03/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.