FourStar星系演化巡天（ZFOURGE）：紫外到远红外星表、中带宽光度红移（精度提高）、恒星质量和静止星系z~3.5的确认
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
摘要：
FourStar星系演化巡天（ZFOURGE）是一个45晚的遗产计划，使用麦哲伦号上的FourStar近红外相机，是迄今为止最敏感的巡天之一。ZFOURGE涵盖了宇宙领域CDFS、COSMOS和UDS的全部$400\ \mathrm{arcmin}^2$，与CANDELS重叠。我们目前的光度计目录包括$>70,000$星系，从超深$K_s$波段探测图像（$25.5-26.5$ AB马格，$5σ$，总），$>80\%$完成$K_s<25.3-25.9$ AB。我们使用5个近红外中等带宽滤波器（$J_1,J_2,J_3,H_s,H_l$）以及在$1.05\ - 2.16\ μm$处的宽带$K_s$到在$\sim0.5$“处的$25-26$ AB。每个字段在$0.3-8\ μm$的$26-40$过滤器中都有辅助成像。我们得到光度红移和恒星的人口性质。与光谱红移的比较表明，光红移的不确定度为$σ_z={0.010,0.009}$，CDFS、COSMOS和UDS的不确定度为0.011。由于光谱样品往往偏向明亮和蓝色的来源，我们还检查了近距离星系对之间的光度红移差异，在$1<z<2.5$发现了$σ_{z,pairs}= 0.01-0.02$。我们量化了$σ_{z,pairs}$如何依赖于红移、星等、SED类型和FourStar介质带的包含。明亮的蓝色恒星形成星系的$σ_{z,pairs}$最小，而红色恒星形成星系的$σ_{z,pairs}$最差。在$1.5<z<2.5$处，包括FourStar中等波段可将$σ_{z,pairs}$降低50\%。我们计算SFR的紫外和超深远红外$Spitzer$ /MIPS和赫歇尔/PACS数据的基础上。我们推导出休息帧$U-V$和$V-J$颜色，并说明这些如何与特定的SFR和灰尘排放$z=3.5$。我们证实了$z\sim3$的静止星系的存在，证明它们的SFR被$>\times15$抑制。
英文摘要：
The FourStar galaxy evolution survey (ZFOURGE) is a 45 night legacy program with the FourStar near-infrared camera on Magellan and one of the most sensitive surveys to date. ZFOURGE covers a total of $400\ \mathrm{arcmin}^2$ in cosmic fields CDFS, COSMOS and UDS, overlapping CANDELS. We present photometric catalogs comprising $>70,000$ galaxies, selected from ultradeep $K_s$-band detection images ($25.5-26.5$ AB mag, $5σ$, 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 $1.05\ - 2.16\ μm$ to $25-26$ AB at a seeing of $\sim0.5$". Each field has ancillary imaging in $26-40$ filters at $0.3-8\ μm$. We derive photometric redshifts and stellar population properties. Comparing with spectroscopic redshifts indicates a photometric redshift uncertainty $σ_z={0.010,0.009}$, and 0.011 in CDFS, COSMOS, and UDS. As spectroscopic samples are often biased towards bright and blue sources, we also inspect the photometric redshift differences between close pairs of galaxies, finding $σ_{z,pairs}= 0.01-0.02$ at $1<z<2.5$. We quantify how $σ_{z,pairs}$ depends on redshift, magnitude, SED type, and the inclusion of FourStar medium bands. $σ_{z,pairs}$ is smallest for bright, blue star-forming samples, while red star-forming galaxies have the worst $σ_{z,pairs}$. Including FourStar medium bands reduces $σ_{z,pairs}$ by 50\% at $1.5<z<2.5$. We calculate SFRs based on ultraviolet and ultradeep far-IR $Spitzer$/MIPS and Herschel/PACS data. We derive rest-frame $U-V$ and $V-J$ colors, and illustrate how these correlate with specific SFR and dust emission to $z=3.5$. We confirm the existence of quiescent galaxies at $z\sim3$, demonstrating their SFRs are suppressed by $>\times15$.
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