Spectral-temporal Correlations in the X-ray Emission of Cygnus X-1 PDF Download
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Author: Moritz Böck
Publisher:
ISBN:
Category :
Languages : en
Pages : 89
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Author: Moritz Böck
Publisher:
ISBN:
Category :
Languages : en
Pages : 89
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Author: Chris Skipper
Publisher: Springer
ISBN: 3319095870
Category : Science
Languages : en
Pages : 176
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This thesis brings together the various techniques of X-ray spectral analysis in order to examine the properties of black holes that vary in mass by several orders of magnitude. In all these systems it is widely accepted that the X-ray emission is produced by Compton up-scattering of lower energy seed photons in a hot corona or accretion flow, and here these processes are examined through a study of the X-ray spectral variability of each source. A new technique is introduced, in which models are fitted to over 2 million X-ray spectra on time-scales as short as 16 ms, and subsequently it is shown that the nature of the correlation between intensity and spectral index is strongly dependent upon the spectral state of the black hole. Finally, the results of an extensive survey of nearby galactic nuclei using the Chandra X-ray telescope are presented in the form of images and spectra, and these results are used along with data from the literature to search for Compton-thick nuclei.
Author: Daniel V. Engovatov
Publisher: Stanford University
ISBN:
Category :
Languages : en
Pages : 126
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Much work has been done on trying to gain insight into the dynamics of accreting systems, such as black hole and neutron star binaries, by analyzing timing measurements from X-ray telescopes. In this thesis we present a novel approach to this problem using a kurtosis measure of the wavelet distribution obtained from the light curve to quantify the presence of intermittent activity. This method is applied to large RXTE data sets for GRS 1915+105, and Cygnus X-1. We demonstrate a new approach to reveal bursting modes. Negative correlation between the presence of a low frequency QPO in the Cygnus X-1 Fourier power spectrum and a wavelet kurtosis indicator of temporal intermittency is observed. A possible interpretation of this anti-correlation is developed using a "dripping handrail" transient chaos model.
Author: Steven Michael Kahn
Publisher:
ISBN:
Category : X-ray astronomy
Languages : en
Pages : 488
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Author: Daniel V. Engovatov
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Much work has been done on trying to gain insight into the dynamics of accreting systems, such as black hole and neutron star binaries, by analyzing timing measurements from X-ray telescopes. In this thesis we present a novel approach to this problem using a kurtosis measure of the wavelet distribution obtained from the light curve to quantify the presence of intermittent activity. This method is applied to large RXTE data sets for GRS 1915+105, and Cygnus X-1. We demonstrate a new approach to reveal bursting modes. Negative correlation between the presence of a low frequency QPO in the Cygnus X-1 Fourier power spectrum and a wavelet kurtosis indicator of temporal intermittency is observed. A possible interpretation of this anti-correlation is developed using a "dripping handrail" transient chaos model.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 892
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Author: Tariq Shahbaz
Publisher: Cambridge University Press
ISBN: 1107181097
Category : Science
Languages : en
Pages : 211
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"This is a basic introduction to the physics of compact objects in the context of High Time Resolution Astrophysics (HTRA)"--
Author: Brian Alexander Vaughan
Publisher:
ISBN:
Category :
Languages : en
Pages : 368
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Author: W. Neil Johnson
Publisher:
ISBN:
Category : Astrophysics
Languages : en
Pages : 764
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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 722
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