Suzaku wide-band observations of black-hole binaries and AGNs: Continuum and Fe-K lines

Shin'ya Yamada, K. Makishima, K. Nakazawa, H. Noda, H. Takahashi, T. Dotani, A. Kubota, K. Ebisawa, Y. Ueda, C. Done

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Suzaku has enabled us to study wide-band spectral and timing properties of black-hole binaries and AGNs more accurately than ever, and revealed how the continuum definition can affect Fe-Kline profiles. We have reproduced 0.5-300 keV spectra of Cyg X-1 and GRO J1655-40 in terms of thermal Comptonization in highly inhomogeneous coronae. In both objects, Rin was constrained by the Fe-K line profile and soft excess as ∼10 Rg, as opposed to the relativistic Fe-K line reported in the literature. We also re-analyzed the 0.7-300 keV Suzaku spectra of GX 339-4, and found that a careful modeling of the continuum leads to Rin>Rg(Yamada et al. 2009), again in disagreement with Miller et al. (2008). Furthermore, through a systematic analysis of AGNs, we discovered a hard spectral component in the HXD-PIN band, which varies independently of the powerlaw. Taking this into account, the time-averaged spectra of MCG-6-30-15 have been explained by invoking neither a large refection fraction, nor an extreme broad Fe-K line. The essence here is that the hard X-ray (20-40 keV) bump may be partially explained as an additional Comptonization component. Our results indicate that the extremely relativistic Fe-K line reported for some objects is not a unique solution, and depends in many cases on the continuum modeling.

Original languageEnglish
Title of host publicationX-ray Astronomy-2009
Subtitle of host publicationPresent Status, Multi-Wavelength Approach and Future Perspectives - Proceedings of the International Conference
Pages317-320
Number of pages4
DOIs
Publication statusPublished - 2010 Aug 26
EventInternational Conference on X-ray Astronomy-2009: Present Status, Multi-Wavelength Approach and Future Perspectives - Bologna, Italy
Duration: 2009 Sep 72009 Sep 11

Publication series

NameAIP Conference Proceedings
Volume1248
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Conference on X-ray Astronomy-2009: Present Status, Multi-Wavelength Approach and Future Perspectives
CountryItaly
CityBologna
Period09/9/709/9/11

Keywords

  • Cyg X-1
  • GX 339-4
  • MCG-6-30-15
  • X-ray binaries

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Yamada, S., Makishima, K., Nakazawa, K., Noda, H., Takahashi, H., Dotani, T., Kubota, A., Ebisawa, K., Ueda, Y., & Done, C. (2010). Suzaku wide-band observations of black-hole binaries and AGNs: Continuum and Fe-K lines. In X-ray Astronomy-2009: Present Status, Multi-Wavelength Approach and Future Perspectives - Proceedings of the International Conference (pp. 317-320). (AIP Conference Proceedings; Vol. 1248). https://doi.org/10.1063/1.3475246