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- W2237643022 abstract "Long-term X-ray variability of the black hole binary, Cygnus X-1, was studied with five years of MAXI data from 2009 to 2014, which include substantial periods of the high/soft state, as well as the low/hard state. In each state, Normalized Power Spectrum densities (NPSDs) were calculated in three energy bands of 2-4 keV, 4-10 keV and 10-20 keV. The NPSDs in a frequency from 1e-7 Hz to 1e-4 Hz are all approximated by a power-law function with an index -1.35 ~ -1.29. The fractional RMS variation ($eta$), calculated in the above frequency range, was found to show the following three properties; (1) $eta$ slightly decreases with energy in the low/hard state; (2) $eta$ increases towards higher energies in the high/soft state; and (3) in the 10-20 keV band, $eta$ is 3 times higher in the high/soft state than in the low/hard state. These properties were confirmed through studies of intensity-correlated changes of the MAXI spectra. Of these three findings, the first one is consistent with that seen in the short-term variability during the LHS. The latter two can be understood as a result of high variability of the hard-tail component seen in the high/soft state with the above very low frequency range, although the origin of the variability remains inconclusive." @default.
- W2237643022 created "2016-06-24" @default.
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- W2237643022 date "2016-03-04" @default.
- W2237643022 modified "2023-10-16" @default.
- W2237643022 title "MAXI observations of long-term variations of Cygnus X-1 in the low/hard and the high/soft states" @default.
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- W2237643022 doi "https://doi.org/10.1093/pasj/psw004" @default.
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