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26 April 2024 |
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Evolution of cross-correlation and time lag of 4U 1735-44 along the branches | | Ya-Juan Lei
; Hao-Tong Zhang
; Cheng-Min Zhang
; Jin-Lu Qu
; Hai-Long Yuan
; Yi-Qiao Dong
; Yong-Heng Zhao
; De-Hua Wang
; Hong-Xing Yin
; Li-Ming Song
; | | Date: |
24 Jan 2013 | | Abstract: | We analyze the cross-correlation function between the soft and hard X-rays of
atoll source 4U 1735-44 with RXTE data, and find the anti-correlated soft and
hard time lags of about hecto-second. On the island state, the observations do
not show any obvious correlations, and most observations of banana branch show
positive correlation. However, the anti-correlations are detected on the upper
banana branch. These results are different from those of Z sources (Cyg X-2, GX
5-1), where the anti-correlation is detected in the low luminosity states, then
the lag timescales of both this atoll and Z sources are found to be similar, at
the magnitude of several tens to hundreds of seconds. As a comparison, it is
noted that the anti-correlated lags of thousand-second have been reported from
the several black hole candidates in their intermediate states. Finally, we
compare the correspondent results of atoll source 4U 1735-44 with those
observed in black hole candidates and Z sources, and the possible origins of
the anti-correlated time lags are discussed. | | Source: | arXiv, 1301.5725 | | Services: | Forum | Review | PDF | Favorites | |
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