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 the result of a systematic study of pileup phenomena seen in theX-ray Imaging Spectrometer, an X-ray CCD instrument, onboard the Suzakuobservatory. Using a data set of observed sources in a wide range of brightnessand spectral hardness, we characterized the pileup fraction, spectralhardening, and grade migration as a function of observed count rate in a frameper pixel. Using the pileup fraction as a measure of the degree of pileup, wefound that the relative spectral hardening (the hardness ratio normalized tothe intrinsic spectral hardness), branching ratio of split events, and that ofdetached events increase monotonically as the pileup fraction increases,despite the variety of brightness and hardness of the sample sources. Wederived the pileup fraction as a function of radius used for event extraction.Upon practical considerations, we found that events outside of the radius witha pileup fraction of 1% or 3% are useful for spectral analysis. We presentrelevant figures, tables, and software for the convenience of users who wish toapply our method for their data reduction of piled-up sources.

Data-oriented Diagnostics of Pileup Effects on the Suzaku XIS