@Article{HirschPSBBGHKKLNRSTW:2020:XrSpFl,
               author = "Hirsch, Maria and Pottschmidt, Katja and Smith, David M. and 
                         Bodaghee, Arash and Bel, Marion Cadolle and Grinberg, Victoria and 
                         Hell, Natalie and KraulB, Felicia and Kreykenbohm, Ingo and 
                         Lohfink, Anne and Nowak, Michael A. and Rodrigues, B{\'a}rbara 
                         Heliodora Gon{\c{c}}alves and Soria, Roberto and Tomsick, John A. 
                         and Wilms, J{\"o}rn",
          affiliation = "{Universit{\"a}t Erlangen-N{\"u}rnberg} and {NASA Goddard Space 
                         Flight Center} and {University of California} and {Georgia College 
                         and State University} and {Max Planck Computing and Data Facility} 
                         and {Universit{\"a}t T{\"u}bingen} and {Lawrence Livermore 
                         National Laboratory} and {University of Amsterdam} and 
                         {Universit{\"a}t Erlangen-N{\"u}rnberg} and {Montana State 
                         University} and {Washington University} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Chinese Academy of Sciences} and 
                         {University of California} and {Universit{\"a}t 
                         Erlangen-N{\"u}rnberg}",
                title = "X-ray spectral and flux variability of the microquasar GRS 
                         1758-258 on timescales from weeks to years",
              journal = "Astronomy \& Astrophysics",
                 year = "2020",
               volume = "636",
                pages = "e1834647",
                month = "Apr.",
             abstract = "We present the spectral and timing evolution of the persistent 
                         black hole X-ray binary GRS 1758-258 based on almost 12 years of 
                         observations using the Rossi X-ray Timing Explorer Proportional 
                         Counter Array. While the source was predominantly found in the 
                         hard state during this time, it entered the thermally dominated 
                         soft state seven times. In the soft state GRS 1758-258 shows a 
                         strong decline in flux above 3 keV rather than the pivoting flux 
                         around 10 keV more commonly shown by black hole transients. In its 
                         3-20 keV hardness intensity diagram, GRS 1758-258 shows a 
                         hysteresis of hard and soft state fluxes typical for transient 
                         sources in outburst. The RXTE-PCA and RXTE-ASM long-term light 
                         curves do not show any orbital modulations in the range of 2-30 d. 
                         However, in the dynamic power spectra significant peaks drift 
                         between 18.47 and 18.04 d for the PCA data, while less significant 
                         signatures between 19 d and 20 d are seen for the ASM data as well 
                         as for the Swift/BAT data. We discuss different models for the 
                         hysteresis behavior during state transitions as well as 
                         possibilities for the origin of the long term variation in the 
                         context of a warped accretion disk.",
                  doi = "10.1051/0004-6361/201834647",
                  url = "http://dx.doi.org/10.1051/0004-6361/201834647",
                 issn = "0004-6361 and 1432-0746",
             language = "en",
           targetfile = "hirsch_xray.pdf",
        urlaccessdate = "27 abr. 2024"
}