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The FourStar galaxy evolution survey (ZFOURGE) is a 45 night legacy programwith the FourStar near-infrared camera on Magellan and one of the mostsensitive surveys to date. ZFOURGE covers a total of $400\ \mathrm{arcmin}^2$in cosmic fields CDFS, COSMOS and UDS, overlapping CANDELS. We presentphotometric catalogs comprising $>70,000$ galaxies, selected from ultradeep$K_s$-band detection images ($25.5-26.5$ AB mag, $5\sigma$, total), and $>80\%$complete to $K_s<25.3-25.9$ AB. We use 5 near-IR medium-bandwidth filters($J_1,J_2,J_3,H_s,H_l$) as well as broad-band $K_s$ at $1.05\ - 2.16\ \mu m$ to$25-26$ AB at a seeing of $\sim0.5$". Each field has ancillary imaging in$26-40$ filters at $0.3-8\ \mu m$. We derive photometric redshifts and stellarpopulation properties. Comparing with spectroscopic redshifts indicates aphotometric redshift uncertainty $\sigma_z={0.010,0.009}$, and 0.011 in CDFS,COSMOS, and UDS. As spectroscopic samples are often biased towards bright andblue sources, we also inspect the photometric redshift differences betweenclose pairs of galaxies, finding $\sigma_{z,pairs}= 0.01-0.02$ at $1<z<2.5$. Wequantify how $\sigma_{z,pairs}$ depends on redshift, magnitude, SED type, andthe inclusion of FourStar medium bands. $\sigma_{z,pairs}$ is smallest forbright, blue star-forming samples, while red star-forming galaxies have theworst $\sigma_{z,pairs}$. Including FourStar medium bands reduces$\sigma_{z,pairs}$ by 50\% at $1.5<z<2.5$. We calculate SFRs based onultraviolet and ultradeep far-IR $Spitzer$/MIPS and Herschel/PACS data. Wederive rest-frame $U-V$ and $V-J$ colors, and illustrate how these correlatewith specific SFR and dust emission to $z=3.5$. We confirm the existence ofquiescent galaxies at $z\sim3$, demonstrating their SFRs are suppressed by$>\times15$.

astrophysical journal/the astrophysical journal

The FourStar Galaxy Evolution Survey (ZFOURGE): ultraviolet to  far-infrared catalogs, medium-bandwidth photometric redshifts with improved  accuracy, stellar masses, and confirmation of quiescent galaxies to z~3.5