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THE 31 DEG2 RELEASE OF THE STRIPE 82 X-RAY SURVEY: THE POINT SOURCE CATALOG

  • Authors: Stephanie M. LaMassa, C. Megan Urry, Nico Cappelluti, Hans Böhringer, Andrea Comastri, Eilat Glikman, Gordon Richards, Tonima Ananna, Marcella Brusa, Carie Cardamone, Gayoung Chon, Francesca Civano, Duncan Farrah, Marat Gilfanov, Paul Green, S. Komossa, Paulina Lira, Martin Makler, Stefano Marchesi, Robert Pecoraro, Piero Ranalli, Mara Salvato, Kevin Schawinski, Daniel Stern, Ezequiel Treister, and Marco Viero

2016 The Astrophysical Journal 817 172.

  • Provider: AAS Journals

Caption: Figure 4.

Cumulative distribution of the fraction of X-ray sources with an r-band counterpart above Rcrit as a function of distance between the X-ray and SDSS positions (﹩{r}_{{\rm{sep}}};﹩ red solid line) and between the randomized X-ray positions and SDSS sources (blue dashed line). The top panels are for the matches from single-epoch imaging (1852 X-ray/SDSS counterparts and 41 random matches) while the bottom panels show the matches to the coadded Jiang et al. (2014) catalog (1652 X-ray/coadded counterparts with 61 spurious associations). The number of spurious matches occurs at rsep distances similar to that as the un-shifted X-ray catalog, indicating that MLE helps to mitigate unassociated sources compared to nearest neighbor matching by using magnitude and astrometric precision information in the calculation.

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