The nucleation fraction of Local Volume galaxies
  Nuclear star clusters (NSCs) are a common phenomenon in galaxy centres and
are found in a vast majority of galaxies of intermediate stellar mass $10^{9}$
M$_{\odot}$. Recent investigations suggest that they are rarely found in the
least and most massive galaxies and that the nucleation fraction increases in
dense environments. It is unclear whether this trend holds true for field
galaxies due to the limited data currently available. Here we present our
results on the nucleation fraction for 601 galaxies in the Local Volume
($\lesssim 12$ Mpc). Covering more than eight orders of magnitude in stellar
mass, this is the largest sample of galaxies analysed in a low-density
environment. Within the Local Volume sample we find a strong dependence of the
nucleation fraction on galaxy stellar mass, in agreement with previous work. We
also find that for galaxies with $M_{\star} < 10^{9}$ M$_{\odot}$, early-type
galaxies have a higher nucleation fraction than late-types. The nucleation
fraction in the Local Volume correlates independently with stellar mass, Hubble
type, and local environmental density. We compare our data to those in galaxy
cluster environments (Coma, Fornax, and Virgo) by compiling previous results
and calculating stellar masses in a homogeneous way. We find significantly
lower nucleation fractions (up to 40$\%$) in galaxies with $M_{\star} \lesssim
10^{9.5}$ M$_{\odot}$, in agreement with previous work. Our results reinforce
the connection between globular clusters and NSCs, but it remains unclear if it
can explain the observed trends with Hubble type and local environment. We
speculate that correlation between the nucleation fraction and cluster
environment weakens for the densest clusters like Coma and Virgo.
