X-ray observation of AM Herculis in a very low state with Suzaku - Astrophysics > High Energy Astrophysical PhenomenaReport as inadecuate




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Abstract: The X-ray observation of AM Her in a very low state was performed with {\itSuzaku} in October 2008. One flare event with a time scale of $\sim$ 3700 secwas detected at the X-ray luminosity of $6.0 \times 10^{29} { m ~erg~sec}^{-1}$ in the 0.5 - 10 keV band assuming at a distance of 91 pc. TheX-ray spectrum is represented by a thermal plasma emission model with atemperature of $8.67 {-1.14}^{+1.31}$ keV. During the quiescence out of theflare interval, {\it Suzaku} also detected significant X-rays at a luminosityof $1.7 \times 10^{29} { m ~erg ~sec}^{-1}$ in the 0.5 - 10 keV band, showinga clear spin modulation at a period of 0.12892732 days at BJD 2454771.581.The X-ray spectra in the quiescence were represented by a MEKAL + Power LawPL model or a single CEMEKL model, which are also supported by phase-resolvedanalyses. A correlation between the temperature and the volume emission measurewas found together with historical X-ray measurements of AM Her in variousstates. In order to account for a possible non-thermal emission from AM Her,particle acceleration mechanisms in the AM Her system are also discussed,including a new proposal of a shock acceleration process on the top of theaccretion column.



Author: Y.Terada 1, M.Ishida 2,3, A.Bamba 2,4, K.Mukai 5, T.Hayashi 2,3, A.Harayama 1 1 Saitama University Japan, 2 ISAS-JAXA Japan, 3 To

Source: https://arxiv.org/



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