ROSAT discovery of bright X-ray sources in globular cluster TER 6 and NGC 6652

Astronomy and Astrophysics – Astronomy

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Globular Clusters, Rosat Mission, Stellar Luminosity, X Ray Binaries, X Ray Sources, Proportional Counters, Spaceborne Astronomy, X Ray Telescopes

Scientific paper

Two previously unknown X-ray sources in the globular clusters Ter 6 and NGC 6652 have been detected by Rosat. The source in Ter 6 has a luminosity between 0.5 and 2.0 keV of about 2.9 x 10 to the 36th erg/s. The source in NGC 6652 has a luminosity about 7.6 x 10 to the 35th erg/s. Both sources are brighter than previous detection limits. These discoveries add two to the small number of known bright X-ray sources in globular clusters. The presence of bright X-ray sources in Ter 6 and NGC 6652 is compatible with the idea that such sources are formed via 2-body tidal capture.

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