出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report on X-ray monitoring observations of the transient black hole candidate (BHC) XTE J1752-223 with the Rossi X-ray Timing Explorer (RXTE). The source was discovered on 2009 October 23 and during its low/hard state (LHS), which lasted for at least 25 days, all timing and spectral properties were similar to those of Cyg X-1 during its canonical hard state. The combined PCA/HEXTE spectra were well fitted by an absorbed broken power law with high energy cut off. When RXTE observations were resumed, after an observational gap due to solar constrains, the source was in the hard intermediate state (HIMS), showing type C QPOs. The source evolved through the soft intermediate state, characterized by a 5 – 10% rms variability and type B QPOs, into the high soft state. In the following it showed several transitions between these states. The combined PCA/HEXTE spectra were well fitted by an absorbed disk black body plus broken power law. After a further 59 days XTE J1752-223 passed through another HIMS at lower luminosity into the LHS. We discuss the different states, including a discussion of the variability diagram, and present the results of our combine spectral (PCA/HEXTE) and timing investigations. In addition, we will discuss the results of our spectral studies in which we combined RXTE and Swift data.
