VizieR Online Data Catalog: Ultraluminous X-ray sources in local Universe (Kovlakas+, 2020)

We use the Heraklion Extragalactic Catalogue (HECATE), a compilation of all galaxies within 200Mpc, from the HyperLEDA (Makarov et al. 2014A&A...570A..13M), arguably the most complete compilation of galaxies with homogenized parameters. The HECATE adopts positions, sizes, morphological classifications, and redshifts from the HyperLEDA. These are complemented with size and redshift information from other catalogues when not available in the HyperLEDA. It also provides robust estimates of distances, along with SFRs, stellar masses, metallicities and nuclear activity classifications.

To identify ULX candidates, we use the CSC 2.0 (https://cxc.harvard.edu/csc2/), which is a publicly available catalogue of all the sources detected in Chandra observations performed up to the end of 2014. It contains 317167 X-ray sources, an improvement of more than a factor of 3 compared to the previous version.

An X-ray source is associated with a HECATE galaxy if it is located within its D₂₅ region. The positional uncertainties of the sources are not considered, since they are negligible with respect to the dimensions of the galaxies. Out of the 317167 sources in the CSC 2.0, we associate 23043 sources to 2218 galaxies within a distance of 200Mpc. The parameters of the host galaxies are listed in Table 1, while the properties of the selected X-ray sources are given in Table 2.

(2 data files).