Nearby galaxies within 50Mpc from NSA, LVG & Leda

This catalog is widely applicable for studies of nearby galaxies and for placing these studies in the context of more distant galaxies. We present one application here: a preliminary analysis of the nuclear X-ray activity of galaxies. Out of 1506 galaxies within the sample that have available Chandra X-ray observations, we find that 291 have detected nuclear sources.

Of the 291 existing Chandra detections, 249 have log(LX)>38.3 and available stellar mass estimates. We find that the X-ray active fractions in early-type galaxies are higher than in late-type galaxies, especially for galaxy stellar masses between 10^9^ and 10^10.5^M_{sun}_. We show that these differences may be due at least in part to the increased astrometric uncertainties in late-type galaxies relative to early types.