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The complete Z-diagram of LMC X-2 | | A.P. Smale
; J. Homan
; E. Kuulkers
; | | Date: |
6 Mar 2003 | | Journal: | Astrophys.J. 590 (2003) 1035-1040 | | Subject: | astro-ph | | Affiliation: | 1,2), J. Homan , E. Kuulkers ( NASA/GSFC, USRA, Brera Observatory, Italy, ESA/ESTEC | | Abstract: | We present results from four Rossi X-ray Timing Explorer (RXTE) observations of the bright low mass X-ray binary LMC X-2. During these observations, which span a year and include over 160 hrs of data, the source exhibits clear evolution through three branches on its hardness-intensity and color-color diagrams, consistent with the flaring, normal, and horizontal branches (FB, NB, HB) of a Z-source, and remarkably similar to Z-tracks derived for GX 17+2, Sco X-1 and GX 349+2. LMC X-2 was observed in the FB, NB, and HB for roughly 30%, 40%, and 30% respectively of the total time covered. The source traces out the full extent of the Z in ~1 day, and the Z-track shows evidence for secular shifts on a timescale in excess of a few days. Although the count rate of LMC X-2 is low compared with the other known Z-sources due to its greater distance, the power density spectra selected by branch show very-low-frequency noise characteristics at least consistent with those from other Z-sources. We thus confirm the identification of LMC X-2 as a Z-source, the first identified outside our Galaxy. | | Source: | arXiv, astro-ph/0303133 | | Services: | Forum | Review | PDF | Favorites | |
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