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@INPROCEEDINGS{Stiele:1020359,
      author       = {Stiele, Holger and Kong, Albert},
      title        = {{F}rom hard to soft: {F}ollowing the evolution of {QPO}s},
      reportid     = {FZJ-2024-00092},
      year         = {2023},
      abstract     = {In 2021, the Neutron star Interior Composition Explorer
                      (NICER) onboard the International Space Station closely
                      monitored an outburst of GX 339-4, the prime example of a
                      low-mass black hole X-ray binary. The dense coverage of this
                      outburst and the increased sensitivity of NICER compared to
                      previous missions allowed us to study in detail the
                      evolution of quasi-periodic oscillations (QPOs) and noise
                      components in the intermediate states as the source
                      transitions from the hard to the soft state. The evolution
                      between these states is a somewhat erratic process with
                      multiple transitions. In our study, we were able to follow
                      the emergence and disappearance of the different types of
                      QPOs in more detail and gain further insight into their
                      evolution. In addition to the power-density spectra, we also
                      investigated the evolution of spectral parameters, but found
                      only a strong correlation between the hardness ratio and the
                      type of QPO observed. We present the results of our study
                      and discuss implications of our findings for the occurrence
                      and coherence of type-B QPOs and their relation to changes
                      in the accretion geometry of the system. We will also
                      consider them in light of the Comptonisation models for
                      type-C and type-B QPOs.},
      month         = {Jun},
      date          = {2023-06-13},
      organization  = {The X-ray Universe 2023, Athens
                       (Greece), 13 Jun 2023 - 16 Jun 2023},
      subtyp        = {After Call},
      cin          = {JSC},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511) / Big Bang to Big Data
                      - B3D [NRW-Cluster für datenintensive Radioastronomie]
                      (PROFILNRW-2020-038B)},
      pid          = {G:(DE-HGF)POF4-5111 / G:(DE-Juel-1)PROFILNRW-2020-038B},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/1020359},
}