ChandraObservations of the Faintest Low‐Mass X‐Ray Binaries | Zendy

C. A. Wilson | Zendy; S. Patel | Zendy; C. Kouveliotou | Zendy; P. G. Jonker | Zendy; M. van der Klis | Zendy; W. H. G. Lewin | Zendy; T. Belloni | Zendy; Mariano Méndez | Zendy

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ChandraObservations of the Faintest Low‐Mass X‐Ray Binaries

Author(s) -

C. A. Wilson,

S. Patel,

C. Kouveliotou,

P. G. Jonker,

M. van der Klis,

W. H. G. Lewin,

T. Belloni,

Mariano Méndez

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/377473

Subject(s) - physics , astrophysics , galaxy , low mass , spectral line , x ray , astronomy , stars , nuclear physics

There exists a group of persistently faint galactic X-ray sources that, basedon 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-raybinaries (LMXBs). We present results from Chandra observations for eight ofthese systems: 4U 1708-408, 2S 1711-339, KS 1739-304, SLX 1735-269, GRS1736-297, SLX 1746-331, 1E 1746.7-3224, and 4U 1812-12. Locations for allsources, excluding GRS 1736-297, SLX 1746-331, and KS 1739-304 (which were notdetected) were improved to 0.6" error circles (90% confidence). Ourobservations support earlier findings of transient behavior of GRS 1736-297, KS1739-304, SLX 1746-331, and 2S 1711-339 (which we detect in one of twoobservations). Energy spectra for 4U 1708-408, 2S 1711-339, SLX 1735-269, 1E1746.7-3224, and 4U 1812-12 are hard, with power law indices typically 1.4-2.1,which are consistent with typical faint LMXB spectra.

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