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We present new stellar mass functions at $z\sim6$, $z\sim7$, $z\sim8$,$z\sim9$ and, for the first time, $z\sim10$, constructed from $\sim800$Lyman-Break galaxies previously identified over the XDF/UDF, parallels and thefive CANDELS fields. Our study is distinctive due to (1) the much deeper($\sim200$ hour) wide-area Spitzer/IRAC imaging at $3.6\mu$m and $4.5\mu$m fromthe GOODS Re-ionization Era wide Area Treasury from Spitzer (GREATS) programand (2) consideration of $z\sim6-10$ sources over a $3\times$ larger area thanprevious HST+Spitzer studies. The Spitzer/IRAC data enable $\ge2\sigma$rest-frame optical detections for an unprecedented $50\%$ of galaxies down to astellar mass limit of $\sim10^{8}\mathcal{M}_\odot$ across all redshifts.Schechter fits to our volume densities suggest a combined evolution incharacteristic mass $\mathcal{M}^*$ and normalization factor $\phi^*$ between$z\sim6$ and $z\sim8$. The stellar mass density (SMD) increases by$\sim1000\times$ in the $\sim500$ Myr between $z\sim10$ and $z\sim6$, withindications of a steeper evolution between $z\sim10$ and $z\sim8$, similar tothe previously-reported trend of the star-formation rate density. Strikingly,abundance matching to the Bolshoi-Planck simulation indicates halo massdensities evolving at approximately the same rate as the SMD between $z\sim10$and $z\sim4$. Our results show that the stellar-to-halo mass ratios, a proxyfor the star-formation efficiency, do not change significantly over the hugestellar mass build-up occurred from $z\sim10$ to $z\sim6$, indicating that theassembly of stellar mass closely mirrors the build-up in halo mass in the first$\sim1$ Gyr of cosmic history. JWST is poised to extend these results into the"first galaxy" epoch at $z\gtrsim10$.

astrophysical journal/the astrophysical journal

Galaxy Stellar Mass Functions from z~10 to z~6 using the Deepest  Spitzer/IRAC Data: No Significant Evolution in the Stellar-to-Halo Mass Ratio  of Galaxies in the First Gyr of Cosmic Time