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The Variable Source Content of the 2XMM Catalogue

This article provides an overview of the variable sources in the 2XMM Catalogue, the largest X-ray catalogue ever produced. It discusses the process of determining the nature of variable sources, statistical breakdown, preliminary population studies, and highlights from the catalogue.

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The Variable Source Content of the 2XMM Catalogue

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  1. The Variable Source Content of the 2XMM Catalogue The Variable Source Content of the 2XMM Catalogue Sean Farrell Natalie Webb, Didier Barret, David Villa-Pascual, Joana Rodrigues Centre d’Etude Spatiale des Rayonnements Toulouse, France Andrew Gosling University of Oulu Oulu, Finland

  2. Overview • Overview • The 2XMM catalogue – a brief introduction • Determining the nature of the variable sources • Statistical breakdown • Preliminary population studies • Some highlights • Conclusions

  3. The 2XMM Catalogue • The 2XMM Serendipitous Source Catalogue • Largest X-ray catalogue ever produced, containing: • 246,897 source detections • 38,320 detections with light curves / spectra • 2,307 detections flagged as variable • 191,870 unique sources • 2,001 unique variable sources

  4. Optical loading OOT event Wings of bright src Determining the Nature • Determining the nature of the variable sources • Manually inspected images, lightcurves & spectra for all 2,001 discrete variable sources • Spurious sources identified from images • Performed a search in SIMBAD around coordinates of real sources • Attempted to determine nature of previously identified sources through SIMBAD and literature search

  5. Statistics

  6. Statistics Breakdown of spurious sources • All spurious sources flagged as “good” due to optical loading from a very bright star in the field • Remaining spurious sources picked up by pipeline

  7. LMC SMC Gal cluster Taurus MC Orion Neb Population Studies All 2XMM Sources

  8. LMC SMC Gal cluster Taurus MC Orion Neb Population Studies Variable 2XMM Sources

  9. Population Studies

  10. Population Studies AGN Unknown XRBs Stars CVs SSS

  11. Compact Objects Compact Objects Population Studies

  12. Highlights • 2.2 hr period • Pow / brem spectrum • Faint XRB or CV? • 3.9 hr period • BB / nsatmos spectrum • Quiescent NS XRB? • 2.1 hr period • Pow / brem spectrum • AM Her CV?

  13. Highlights • 1.2 hr period • Brem spectrum • CV? • 1.6 hr period • Pow / brem spectrum • XRB or CV? • 627 s period • Cut-off pow spectrum • Long-period pulsar

  14. Highlights • 237 s period • Power law spectrum • >8 NIR counterparts, 1 very blue • Another long-period pulsar? 237 s

  15. Conclusions • Conclusions • ~41% variable sources spurious, vast majority picked up by pipeline • ~38% real sources unknown, ~37% stars, remaining sources mostly compact objects (AGN, CVs, XRBs) • New populations of faint sources emerging, providing insight into X-ray emission over wider range of luminosities • 2XMM catalogue is a powerful resource for population studies of all kinds of objects

  16. Questions? Thanks for your attention Gratuitous poster plug… Soft X-ray Sources in the 2XMM Catalogue Rodrigues, Farrell, Webb & Barret Poster D.10

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