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A variable-frequency HFQPO in GRS 1915+105 as observed with Astrosat | | Tomaso M. Belloni
; Dipankar Bhattacharya
; Pietro Caccese
; Varun Bhalerao
; Santosh Vadawale
; J.S. Yadav
; | | Date: |
1 Aug 2019 | | Abstract: | From the analysis of more than 92 ks of data obtained with the laxpc
instrument on board Astrosat we have detected a clear high-frequency QPO whose
frequency varies between 67.4 and 72.3 Hz. In the classification of variability
classes of GRS 1915+105, at the start of the observation period the source was
in class omega and at the end the variability was that of class mu: both
classes are characterized by the absence of hard intervals and correspond to
disk-dominated spectra. After normalization to take into account time
variations of the spectral properties as measured by X-ray hardness, the QPO
centroid frequency is observed to vary along the hardness-intensity diagram,
increasing with hardness. We also measure phase lags that indicate that HFQPO
variability at high energies lags that at lower energies and detect systematic
variations with the position on the hardness-intensity diagram. This is the
first time that (small) variations of the HFQPO frequency and lags are observed
to correlate with other properties of the source. We discuss the results in the
framework of existing models, although the small (7%) variability observed is
too small to draw firm conclusions. | | Source: | arXiv, 1908.0437 | | Services: | Forum | Review | PDF | Favorites | |
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