The photon-index–time-lag correlation in black hole X-ray binaries
| Autor: | M. T. Costado, I. E. Papadakis, Pablo Reig, Nikolaos D. Kylafis |
|---|---|
| Přispěvatelé: | General Secretariat of Research and Technology (Greece) |
| Rok vydání: | 2017 |
| Předmět: |
Index (economics)
Astrophysics::High Energy Astrophysical Phenomena Lifelong learning FOS: Physical sciences Astrophysics 01 natural sciences X-rays: binaries General Relativity and Quantum Cosmology Binary black hole 0103 physical sciences Stars: black holes black holes [Stars] 010303 astronomy & astrophysics High Energy Astrophysical Phenomena (astro-ph.HE) Physics Spectral index 010308 nuclear & particles physics Astronomy and Astrophysics Black hole Work (electrical) Galaxies: jets Space and Planetary Science Intermediate-mass black hole jets [Galaxies] binaries [X-rays] Stellar black hole Astrophysics - High Energy Astrophysical Phenomena |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stx2683 |
| Popis: | We have performed a timing and spectral analysis of a set of black hole binaries to study the correlation between the photon index and the time lag of the hard photons with respect to the soft ones. We provide further evidence that the timing and spectral properties in black hole X-ray binaries are coupled. In particular, we find that the average time lag increases as the X-ray emission becomes softer. Although a correlation between the hardness of the X-ray spectrum and the time (or phase) lag has been reported in the past for a handful of systems, our study confirms that this correlated behaviour is a global property of black hole X-ray binaries. We also demonstrate that the photon-index-time-lag correlation can be explained as a result of inverse Comptonization in a jet. © 2018 The Author(s). NDK acknowledges a useful discussion with Emrah Kalemci regarding the correlation of time lag with spectral index in his PhD Thesis. This discussion sparked the research reported in this paper. This work was supported in part by the 'AGNQUEST' project, which is implemented under the 'Aristeia II' Action of the 'Education and Lifelong Learning' operational programme of the GSRT, Greece. |
| Databáze: | OpenAIRE |
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