We make public our catalogue of X-ray selected AGN in the XMM-XXL north field as presented in Menzel et al. (2016) and Liu et al. (2016). The X-ray selected AGN sample is compiled from the wide-area and shallow XXL-North survey part of the XMM-XXL survey (Pierre et al., 2015), which covers a total area of about 50 deg² split into two nearly equal size fields with an exposure time of about 10 ks per XMM pointing.
We created a source catalogue of the equatorial subregion which overlaps with the W1 field in the Canada-France-Hawaii Legacy Survey> (CFHTLS) and extends to about 25 deg² the area covered by the original 11deg² XMM-LSS survey (Clerc et al. 2014). We detected 8445 point-like X-ray sources above a limiting flux of F_{0.5-10 keV} = 1⋅10^-15 erg cm^-2s^-1. The X-ray sources have been matched to optical (SDSS) and infrared (WISE) counterparts based on Likelihood-Ratio method as applied in Georgakakis & Nandra (2011). The SDSS-counterparts have been retrieved from SDSS-DR8 (Aihara et al., 2011), together with their probability to be QSO as defined in the XDQSO-catalogue by Bovy et al. (2011). The WISE-counterparts are taken from the allWISE data release.

In a ∼18 deg² area of the northern XMM-XXL field, by mean of two dedicate ancillary programmes described in DR12 (Alam et al., (2015), and Paris et al. (2015), submitted), we followed up 3042 X-ray sources brighter than r = 22.5 mag with the BOSS spectrograph (SDSS). The spectra have been visually inspected and yielded a reliable redshift measurement for 2578 AGN in the redshift range z = 0.02-5.0, with luminosities 10³⁹ erg s^-1 < L_{0.5-10 keV} < 10⁴⁶ erg s^-1. The spectroscopic catalog, presentend in Menzel et al. (2016), is currently the largest published spectroscopic sample of X-ray selected AGN in a contiguous area.

Through this website we provide:

• The detailed X-ray properties of the point-like X-ray sources, as described in Liu et al. 2016. In particular here you can find:
  • All the 8445 X-ray detected point-like sources (FITS file). The description for each column can be found in Liu et al. 2016.
  • Sources with reliable redshift measurements, optical classifications (as from Menzel et al 2016) and X-ray spectral fitting parameters. In this catalogue, the median value, as well as the 3rd, 16th, 84th and 97th percentiles, of the posterior distribution of each parameter (column density, photon index, normalization, normalizations of the reflection and scattering components, and hard X-ray luminosity) for each source are also given. The estimation of these parameters can be found in Liu et al. 2016.
  • The monochromatic luminosity, the BH mass as well as the Eddington ratio for the type 1 AGNs (table 3 in Liu et al. 2016).


• the Web interface linking each source to the SDSS Skyserver. The source list with the relative counterpart in SDSS, WISE, XDQSO and redshift information as presented in Menzel et al. (2016) are also available as a tar file here.

XMM-XXL north area with sky coordinates of XMM-Newton sources and associated BOSS observed targets: We extracted 8445 point-like X-ray sources (grey) over a ∼ 18 deg² area of the XMM-XXL north. At the time of our reduction (January 2012), the pointing of XMM-Newton in the XMM-XXL north area was not yet completed. The spectroscopic follow-up of the XMM-Newton sources with BOSS has been performed during two ancillary programmes (blue markers) and completed by former targets from BOSS-DR10 (purple markers).