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Stellar mass estimates of massive galaxies are susceptible to systematicerrors in their photometry, due to their extended light profiles. In this studywe use data from the Dragonfly Wide Field Survey (DWFS) to accurately measurethe total luminosities and colors of nearby massive galaxies. The low surfacebrightness limits of the survey ($\mu_g \approx $ 31 mag arcsec $^{-2}$ on aone arcmin scale) allows us to implement a method, based on integrating the 1-Dsurface brightness profile, that is minimally dependent on anyparameterization. We construct a sample of 1188 massive galaxies with $\logM_*/M_\odot > 10.75$ based on the Galaxy Mass and Assembly (GAMA) survey andmeasure their total luminosities and $g-r$ colors. We then compare ourmeasurements to various established methods applied to imaging from the SloanDigital Sky Survey (SDSS), focusing on those favored by the GAMA survey. Ingeneral, we find that galaxies are brighter in the $r$ band by an average of${\sim}0.05$ mag and bluer in $g-r$ colors by $\sim 0.06$ mag compared to theGAMA measurements. These two differences have opposite effects on the stellarmass estimates. The total luminosities are larger by $5\%$ but themass-to-light ratios are lower by $\sim 10\%$. The combined effect is that thestellar mass estimate of massive galaxies decreases by $7\%$. This, in turn,implies a small change in number density of massive galaxies: $\leq 30\%$ at$\log M_*/M_\odot \geq 11$.

astrophysical journal/the astrophysical journal

The Dragonfly Wide Field Survey. II. Accurate Total Luminosities and  Colors of Nearby Massive Galaxies and Implications for the Galaxy Stellar  Mass Function