X-ray sources and their optical counterparts in the globular cluster M 22

NA Webb, D Serre, B Gendre, D Barret, JP Lasota, L Rizzi

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Using XMM-Newton EPIC imaging data, we have detected 50 low-luminosity X-ray sources in the field of view of M 22, where 5+/-3 of these sources are likely to be related to the cluster. Using differential optical photometry, we have identified probable counterparts to those sources belonging to the cluster. Using X-ray spectroscopic and timing studies, supported by the optical colours, we propose that the most central X-ray sources in the cluster are cataclysmic variables, millisecond pulsars, active binaries and a blue straggler. We also identify a cluster of galaxies behind this globular cluster.

Original languageEnglish
Pages (from-to)133-143
Number of pages11
JournalAstronomy & Astrophysics
Issue number1
Publication statusPublished - Sep 2004
Externally publishedYes

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