SIMBAD references

Since NGC300 is a bulgeless, isolated low-mass galaxy and it has not experienced radial migration during its evolution history, it can be treated as an ideal laboratory to test the simple galactic chemical evolution model. Our main aim is to investigate the main properties of the star formation history (SFH) of NGC300 and compare its SFH with that of M33 to explore the common properties and differences between these two nearby low-mass systems. We construct a simple chemical evolution model for NGC300, assuming its disk forms gradually from continuous accretion of primordial gas and including the gas-outflow process. The model allows us to build a bridge between the SFH and observed data of NGC300, in particular, the present-day radial profiles and global observed properties (e.g., cold gas mass, star formation rate, and metallicity). By means of comparing the model predictions with the corresponding observations, we adopt the classical χ² methodology to find out the best combination of free parameters a, b, and b_out. Our results show that by assuming an inside-out formation scenario and an appropriate outflow rate, our model reproduces well most of the present-day observational values. The model not only reproduces well the radial profiles, but also the global observational data for the NGC300 disk. Our results suggest that NGC300 may experience a rapid growth of its disk. Through comparing the best-fitting, model-predicted SFH of NGC300 with that of M33, we find that the mean stellar age of NGC300 is older than that of M33 and there is a recent lack of primordial gas infall onto the disk of NGC300. Our results also imply that the local environment may play a key role in the secular evolution of galaxy disks.