The rms-flux relations in different branches in Cyg X-2
High Energy Astrophysical Phenomena
2015-06-04 v1
Abstract
In this paper, the rms-flux (root mean square-flux) relation along the Z-track of the bright Z-Source Cyg X-2 is analyzed using the observational data of Rossi X-ray Timing Explorer (RXTE). Three types of rms-flux relations, i.e. positive, negative, and 'arch'-like correlations are found in different branches. The rms is positively correlated with flux in normal branch (NB), but anti-correlated in the vertical horizontal branch (VHB). The rms-flux relation shows an 'arch'-like shape in the horizontal branch (HB). We also try to explain this phenomenon using existing models.
Cite
@article{arxiv.1204.1849,
title = {The rms-flux relations in different branches in Cyg X-2},
author = {Z. B. Li and L. M. Song and J. L. Qu and Y. J. Lei and J. Y. Nie and C. M. Zhang},
journal= {arXiv preprint arXiv:1204.1849},
year = {2015}
}
Comments
Accepted for publication in Astrophysics & Space Science