使用VST进行的天炉座深度测量（FDS）：IV。天炉座星系团区域矮星系的大小和星等限制目录
The Fornax Deep Survey (FDS) with the VST: IV. A size and magnitude limited catalog of dwarf galaxies in the area of the Fornax cluster
摘要：
Fornax Deep Survey（FDS）是一种u '、g'、r '和i'波段的成像调查，与以前的空间完整的Fornax Cluster Catalog（FCC）相比，具有最高的分辨率和图像深度。我们的新数据使我们能够研究r '波段星等m $_{r'}\approx$ 21等（M $_{r'}\approx$ -10.5等）的星系。这些数据为研究天炉座星系团提供了重要的遗留数据集。我们的目标是目前的天炉座深巡天（FDS）矮星系目录，重点是解释数据的减少和校准，评估数据的质量，并描述用于定义目录对象的集群成员的方法。作为第一步，我们使用SExtractor微调矮星系检测，从FDS数据中找到星系，覆盖主星系团的26度$^2$区域，以及天炉座A子结构周围的区域。我们使用GALFIT对识别出的星系进行了二维分解。利用色-星等、光度-半径和光度-浓度关系将星系团与背景星系分离。然后根据星系团的形态将其分为早型星系和晚型星系，并给出了一级形态分类。我们的最终目录包括14，095个星系。我们将590个星系归类为可能的天炉座星系团星系，其中564个是矮星（M $_{r'}$ > -18.5等），构成了我们的天炉座矮星目录。在这些星系团中，我们将470个归类为早期类型，94个归类为晚期类型。我们的最终星表在M等$_{r'}$ = -10.5等和表面亮度$\barμ_{e,r'}$ = 26等角秒-2时达到了50%的完整性极限，这比FCC深了大约3等。根据以前的工作和光谱确认的子样本的比较，我们估计我们最终的天炉座矮星系目录有< 10%的污染，从背景对象。
英文摘要：
The Fornax Deep Survey (FDS), an imaging survey in the u', g', r', and i'-bands, has a supreme resolution and image depth compared to the previous spatially complete Fornax Cluster Catalog (FCC). Our new data allows us to study the galaxies down to r'-band magnitude m$_{r'}\approx$21 mag (M$_{r'}\approx$-10.5 mag). These data provide an important legacy dataset to study the Fornax cluster. We aim to present the Fornax Deep Survey (FDS) dwarf galaxy catalog, focusing on explaining the data reduction and calibrations, assessing the quality of the data, and describing the methods used for defining the cluster memberships for the catalog objects. As a first step we used the SExtractor fine-tuned for dwarf galaxy detection, to find galaxies from the FDS data, covering a 26 deg$^2$ area of the main cluster, and the area around the Fornax A substructure. We made 2D-decompositions of the identified galaxies using GALFIT. We used color-magnitude, luminosity-radius and luminosity-concentration relations to separate the cluster galaxies from the background galaxies. We then divided the cluster galaxies into early- and late-type galaxies according to their morphology and gave first order morphological classifications. Our final catalog includes 14,095 galaxies. We classify 590 galaxies as being likely Fornax cluster galaxies, of which 564 are dwarfs (M$_{r'}$ > -18.5 mag) consisting our Fornax dwarf catalog. Of the cluster dwarfs we classify 470 as early-types, and 94 as late-type galaxies. Our final catalog reaches its 50% completeness limit at magnitude M$_{r'}$ = -10.5 mag and surface brightness $\barμ_{e,r'}$ = 26 mag arcsec-2, which is approximately three magnitudes deeper than the FCC. Based on previous works and comparison with a spectroscopically confirmed subsample, we estimate that our final Fornax dwarf galaxy catalog has < 10% contamination from the background objects.
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