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Chandra Observations of the Faintest Low-Mass X-ray Binaries | | Colleen. A. Wilson
; Sandeep K. Patel
; Chryssa Kouveliotou
; Peter G. Jonker
; Michiel van der Klis
; Walter H.G Lewin
; Tomaso Belloni
; Mariano Mendez
; | | Date: |
2 Jul 2003 | | Journal: | Astrophys.J. 596 (2003) 1220-1228 | | Subject: | astro-ph | | Abstract: | There exists a group of persistently faint galactic X-ray sources that, based on their location in the galaxy, high L_x/L_opt, association with X-ray bursts, and absence of low frequency X-ray pulsations, are thought to be low-mass X-ray binaries (LMXBs). We present results from Chandra observations for eight of these systems: 4U 1708-408, 2S 1711-339, KS 1739-304, SLX 1735-269, GRS 1736-297, SLX 1746-331, 1E 1746.7-3224, and 4U 1812-12. Locations for all sources, excluding GRS 1736-297, SLX 1746-331, and KS 1739-304 (which were not detected) were improved to 0.6" error circles (90% confidence). Our observations support earlier findings of transient behavior of GRS 1736-297, KS 1739-304, SLX 1746-331, and 2S 1711-339 (which we detect in one of two observations). Energy spectra for 4U 1708-408, 2S 1711-339, SLX 1735-269, 1E 1746.7-3224, and 4U 1812-12 are hard, with power law indices typically 1.4-2.1, which are consistent with typical faint LMXB spectra. | | Source: | arXiv, astro-ph/0307045 | | Services: | Forum | Review | PDF | Favorites | |
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