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Title:
Timescale-Resolved Spectroscopy of Cyg X-1
Authors:
Wu, Y. X.; Li, T. P.; Belloni, T. M.; Wang, T. S.; Liu, H.
Affiliation:
AA(Department of Engineering Physics and Center for Astrophysics, Tsinghua University, Beijing, China ), AB(Department of Engineering Physics and Center for Astrophysics, Tsinghua University, Beijing, China ; Department of Physics and Center for Astrophysics, Tsinghua University, Beijing, China ; Particle Astrophysics Laboratory, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China ), AC(INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, I-23807 Merate, Italy), AD(Department of Physics and Center for Astrophysics, Tsinghua University, Beijing, China ), AE(Particle Astrophysics Laboratory, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China )
Publication:
The Astrophysical Journal, Volume 695, Issue 2, pp. 921-929 (2009). (ApJ Homepage)
Publication Date:
04/2009
Origin:
IOP
ApJ Keywords:
binaries: general, methods: data analysis, stars: individual: Cyg X-1, X-rays: general
DOI:
10.1088/0004-637X/695/2/921
Bibliographic Code:
2009ApJ...695..921W

Abstract

We propose the timescale-resolved spectroscopy (TRS) as a new method to combine the timing and spectral study. The TRS is based on the time domain power spectrum and reflects the variable amplitudes of spectral components on different timescales. We produce the TRS with the RXTE PCA data for Cyg X-1 and study the spectral parameters (the power-law photon index and the equivalent width of the iron fluorescent line) as a function of timescale. The results of TRS and frequency-resolved spectra have been compared, and similarities have been found for the two methods with the identical motivations. We also discover the correspondences between the evolution of photon index with timescale and the evolution of the equivalent width with timescale. The observations can be divided into three types according to the correspondences and different type is connected with different spectral state.
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