All Tables

• Table 1: Optical and X-ray properties of ULXs. 1-2. main and alternative identification of the ULX candidates analyzed in this work (LM and LB stand for Liu & Mirabel 2005 and Liu & Bregman 2005, respectively); 3-4. X-ray RA (J2000) and Dec (2000) coordinates; 5. Log of the Luminosity in the 2-10 keV band (for object SW78 the quoted luminosity is in the 0.5-8 keV band) assuming that the X-ray sources were at the distance of the parent galaxy; 6-8. identification, morphological type and distance of the parent galaxy; 9. difference in arcsec between X-ray and nominal optical coordinates.
• Table 2: Observations. 1. identification of the ULXs. 2. telescope and instrument used. 3. epoch of observations. 4. exposure time.
• Table 3: Main features in the optical spectra. 1. identification of the ULXs; 2. observed wavelength; 3. spectral line identification; 4. redshift.