标题： NTT苏西深场 显示英文标题

标题： The NTT Susi Deep Field

摘要： 我们给出了一个包含高红移（z=4.7）类星体BR 1202-0725以南80弧秒的5.62平方角分区域内星系的深BVrI多色星表，该星表来源于使用ESO NTT上的SUSI直接CCD相机的观测。 形式上的5$\sigma$星等限制值（在2倍FWHM孔径内）分别为B、V、r和I波段的26.9、26.5、25.9和25.3。 讨论了恒星和星系样本的计数和颜色，并与I波段的HST深图像进行了比较。 估计在SUSI数据中达到此星等极限的合并或混合星系的比例不超过1%。 在同一银道纬度但指向银河中心的区域，发现该场域中的恒星密度约为3倍，约有20%的对象具有V-I > 3.0。 对于选至r = 26的星系，已可靠测量其颜色。 光学滤光片的选择已被优化，以定义一个稳健的3.8 <= z <= 4.4区间内的星系多色选择。 在此区间内，该场域中r < 26的星系候选者的面密度为2.7 +/- 0.4 弧分^-2，对应于3.8 <= z <= 4.4区间内的共动恒星形成率密度为10^{-2.00} - 10^{-1.82} h^3 Mo /yr/Mpc^3。 显示英文摘要

摘要： We present a deep BVrI multicolor catalog of galaxies in a 5.62 sq.arcmin field 80 arcsec south of the high redshift (z=4.7) quasar BR 1202-0725, derived from observations with the direct CCD camera SUSI at the ESO NTT. The formal 5$\sigma$ magnitude limits (in 2 x FWHM apertures) are 26.9, 26.5, 25.9 and 25.3 in B, V, r and I respectively. Counts, colors for the star and galaxy samples are discussed and a comparison with a deep HST image in the I band is presented. The percentage of merged or blended galaxies in the SUSI data to this magnitude limit is estimated to be not higher than 1%. At the same galactic latitude of the HDF but pointing toward the galactic center, the star density in this field is found to be ~3 times higher, with ~20% of the objects with V-I > 3.0. Reliable colors have been measured for galaxies selected down to r = 26. The choice of the optical filters has been optimized to define a robust multicolor selection of galaxies at 3.8 <= z <= 4.4. Within this interval the surface density of galaxy candidates with r < 26 in this field is 2.7 +/- 0.4 arcmin^-2 corresponding to a comoving density of Star Formation Rate at 3.8 <= z <= 4.4 of 10^{-2.00} - 10^{-1.82} h^3 Mo /yr/ Mpc^3.