English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present an analysis of X-ray spectra of the high mass X-ray binary 4U0115+634 as observed with Suzaku and RXTE in 2011 July, during the fading phaseof a giant X-ray outburst. We used a continuum model consisting of an absorbedcutoff power-law and an ad-hoc Gaussian emission feature centered around 8.5keV, which we discuss to be due to cyclotron emission. Our results areconsistent with a fundamental cyclotron absorption line centered at${\sim}10.2$ keV for all observed flux ranges. At the same time we rule outsignificant influence of the 8.5 kev Gaussian on the CRSF parameters, which arenot consistent with the cyclotron line energies and depths of previouslyreported flux-dependent descriptions. We also show that some continuum modelscan lead to artificial line-like residuals in the analyzed spectra, which arethen misinterpreted as unphysically strong cyclotron lines. Specifically, ourresults do not support the existence of a previously claimed additionalcyclotron feature at ${\sim}15$ keV. Apart from these features, we find for thefirst time evidence for a He-like Fe XXV emission line at ${\sim}6.7$ keV andweak H-like Fe XXVI emission close to ${\sim}7.0$ keV.

The giant outburst of 4U 0115+634 in 2011 with Suzaku and RXTE