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arXiv 2408.03629astro-ph.GAastro-ph.CO
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AstroSat 紫外深场南——I. GOODS South 区域的远紫外与近紫外源表

AstroSat UV Deep Field South -- I. Far and Near-ultraviolet Source Catalog of the GOODS South region

Kanak Saha, Soumil Maulick, Pushpak Pandey, Souradeep Bhattacharya, Anshuman Borgohain, Chayan Mondal, Marc Rafelski, Manish Kataria, Harry I. Teplitz, Shyam N.… 展开作者

Kanak Saha, Soumil Maulick, Pushpak Pandey, Souradeep Bhattacharya, Anshuman Borgohain, Chayan Mondal, Marc Rafelski, Manish Kataria, Harry I. Teplitz, Shyam N. Tandon, Rogier A. Windhorst, Bruce G. Elmegreen, Edmund Christian Herenz, Michael Rutkowski

备注：
26 pages, 19 figures, 7 tables, accepted for publication in the Astrophysical Journal Supplement Series, comments are welcome
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AI总结：

本文介绍了 AstroSat 紫外深场南巡天，在 GOODS South 场获得最深且覆盖最大面积的远/近紫外图像，构建了 F154W 和 N242W 两个源表，为研究高红移电离光子星系、紫外光度函数和星系紫外形态等提供了关键数据。

摘要：

我们展示了 AstroSat 紫外深场南（AUDFs），这是一项使用 AstroSat 上搭载的宽视场紫外成像望远镜进行的成像巡天。AUDFs 覆盖约 236 平方角分的天空区域，包括大天文台起源深空巡天（GOODS）South 场，使用 F154W 和 N242W 滤光片。AUDFs 的深场和浅场部分在 F154W 滤光片中的曝光时间分别约为 62000 秒和 31000 秒，而在 N242W 滤光片中分别约为 64000 秒和 34000 秒。这些观测在 F154W 和 N242W 滤光片中分别达到了 27.2 和 27.7 AB 星等的 3σ 深度，50% 完备极限分别为 27 和 27.6 AB 星等。凭借所达到的深度，AUDFs 是迄今已知在 1.2 角秒至 1.6 角秒空间分辨率下覆盖最大面积的最深远紫外和近紫外成像数据。我们为 F154W 和 N242W 滤光片分别构建了两个主要源表，各包含 13495 个和 19374 个亮于 3σ 探测极限的源。我们在 N242W 滤光片中的星系计数幂律斜率约为 0.43 dex mag^{-1}，与 HST/WFC3/UVIS 的观测结果吻合良好。利用这一独特数据可以实现广泛的河外科学研究，例如提供在红移 z ~ 1 - 3 及更远范围内发射电离光子的星系样本；约束紫外光度函数；研究恒星形成星系周围的延展紫外（XUV）辐射以及 z < 1 的紫外形态。该紫外源表将提升 GOODS South 场上现有地面和空间望远镜光学/红外成像与光谱观测的遗产价值。

英文摘要：

We present the AstroSat UV Deep Field South (AUDFs), an imaging survey using the wide-field Ultraviolet Imaging Telescope on board AstroSat. AUDFs covers $\sim 236$ arcmin$^{2}$ of the sky area, including the Great Observatories Origins Deep Survey (GOODS) South field in F154W and N242W filters. The deep and shallow parts of AUDFs have exposure time $\sim 62000$ and $\sim31000$ sec respectively, in the F154W filter, while in the N242W filter, they are $\sim 64000$ and $\sim34000$ sec. These observations reached a $3σ$ depth of 27.2 and 27.7 AB mag with a $50\%$ completeness limit of 27 and 27.6 AB mag in the F154W and N242W filters, respectively. With the acquired depth, AUDFs is the deepest far and near-UV imaging data covering the largest area known to date at 1.2" - 1.6" spatial resolution. Two primary catalogs were constructed for the F154W and N242W filters, each containing 13495 and 19374 sources brighter than the 3$σ$ detection limit, respectively. Our galaxy counts power-law slope $\sim0.43$~dex~mag$^{-1}$ in the N242W filter matches well with HST/WFC3/UVIS observations. A wide range of extra-galactic science can be achieved with this unique data, such as providing a sample of galaxies emitting ionizing photons in the redshift range $z \sim 1 - 3$ and beyond; constraining the UV luminosity function, investigating the extended-UV (XUV) emission around star-forming galaxies and UV morphologies for $z < 1$. The UV catalog will enhance the legacy value of the existing optical/IR imaging and spectroscopic observations from ground and space-based telescopes on the GOODS South field.

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