Faint X-ray Sources in the Globular Cluster Terzan 5

Details Faint X-ray Sources in the Globular Cluster Terzan 5 Faint X-ray Sources in the Globular Cluster Terzan 5

2006-06-11

arxiv.org/abs/astro-ph/0606253v2

Astrophys.J.651:1098-1111,2006

Astronomy and Astrophysics

Astrophysics

15 pages, 10 figures (3 color). Resubmitted to ApJ after incorporating referee comments. v2: Added references to introduction

Scientific paper

10.1086/507884

We report our analysis of a Chandra X-ray observation of the rich globular cluster Terzan 5, in which we detect 50 sources to a limiting 1.0-6 keV X-ray luminosity of 3*10^{31} ergs/s within the half-mass radius of the cluster. Thirty-three of these have L_X>10^{32} ergs/s, the largest number yet seen in any globular cluster. In addition to the quiescent low-mass X-ray binary (LMXB, identified by Wijnands et al.), another 12 relatively soft sources may be quiescent LMXBs. We compare the X-ray colors of the harder sources in Terzan 5 to the Galactic Center sources studied by Muno and collaborators, and find the Galactic Center sources to have harder X-ray colors, indicating a possible difference in the populations. We cannot clearly identify a metallicity dependence in the production of low-luminosity X-ray binaries in Galactic globular clusters, but a metallicity dependence of the form suggested by Jordan et al. for extragalactic LMXBs is consistent with our data.

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