The SPIDERS-AGN targeting strategy, has been designed to collect about 40 000 spectra of X-ray AGN, and to bring population studies of accreting super-massive black holes to a new level of accuracy. First demonstrations of the SPIDERS science applications, based on the BOSS follow-up of X-ray selected AGN in the Northern XMM-XXL field, were presented by Menzel et al. (2016) and Liu et al. (2016). We present in this webpage the first phase of the SPIDERS-AGN programme (a.k.a. `Tier-0') which exploits existing (pre-eROSITA) all-sky X-ray source catalogues to explore the bright end of the X-ray AGN population. The detailed descriptions and discussion for these results are presented in Dwelly et al. 2017 .

Sky distribution of the X-ray source samples considered in this paper. Top panel: RASS source density map gridded with a HEALPix pixelisation and displayed with an Equatorial Hammer-Aitoff projection. The density variations (and holes) are primarily due to the variations in effective exposure time and background count rate during the ROSAT survey. Bottom panel: Same for the XMMSL sources, but shown with a coarser pixel scale. Note the differences in the greyscale ranges. The (solid blue) line indicates the perimeter of the BOSS imaging footprint.

  • Acknowledgements: please cite Clerc et al.2016 Dwelly et al., 2017, Salvato et al., 2018 and Comparat et al., 2020 if you use our data.
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