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Chandra Observations of the Faintest Low-Mass X-Ray BinariesA group of persistently faint Galactic X-ray sources exist that, based on their location in the Galaxy, high L(sub X)/L(sub 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 these sources, excluding GRS 1736-297, SLX 1746-331, and KS 1739-304 (which were not detected), were improved to 0.6 sec 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 is consistent with typical faint LMXB spectra.
Document ID
20030113141
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Wilson, Colleen A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Patel, Sandeep K.
(National Academy of Sciences - National Research Council Huntsville, AL, United States)
Kouveliotou, Chryssa
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Jonker, Peter G.
(Cambridge Univ. Cambridge, United Kingdom)
vanderKlis, Michiel
(Astronomical Inst. Amsterdam, Netherlands)
Lewin, Walter H. G.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Belloni, Tomaso
(Osservatorio Astronomico di Brera Merate, Italy)
Mendez, Mariano
(Space Research Organization Netherlands Utrecht, Netherlands)
Date Acquired
August 21, 2013
Publication Date
October 20, 2003
Publication Information
Publication: Astrophysical Journal
Publisher: American Astronomical Society
Volume: 596
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: GO0-1054A
CONTRACT_GRANT: GO2-3046B
Distribution Limits
Public
Copyright
Other

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