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Observations of The High Mass X-ray Binary A0535+26 in Quiescence | Richard Rothschild
; Alex Markowitz
; Paul Hemphill
; Isabel Caballero
; Katja Pottschmidt
; Matthias Kuehnel
; Joern Wilms
; Felix Fuerst
; Victor Doroshenko
; Ascension Camero-Arranz
; | Date: |
26 Apr 2013 | Abstract: | We have analyzed 3 observations of the High Mass X-ray Binary A0535+26
performed by the Rossi X-ray Timing Explorer (RXTE) 3, 5, and 6 months after
the last outburst in 2011 February. We detect pulsations only in the second
observation. The 3-20 keV spectra can be fit equally well with either an
absorbed power law or absorbed thermal bremsstrahlung model. Re-analysis of 2
earlier RXTE observations made 4 years after the 1994 outburst, original
BeppoSAX observations 2 years later, re-analysis of 4 EXOSAT observations made
2 years after the last 1984 outburst, and a recent XMM-Newton observation in
2012 reveal a stacked, quiescent flux level decreasing from ~2 to <1 x 10^{-11}
ergs/cm2/s over 6.5 years after outburst. Detection of pulsations during half
of the quiescent observations would imply that accretion onto the magnetic
poles of the neutron star continues despite the fact that the circumstellar
disk may no longer be present. The accretion could come from material built-up
at the corotation radius or from an isotropic stellar wind. | Source: | arXiv, 1304.7283 | Services: | Forum | Review | PDF | Favorites |
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