HST PEARS棱栅测量的发射线Galerkin I：南部场
Emission-Line Galaxies from the HST PEARS Grism Survey I: The South Fields
摘要：
我们目前的搜索结果的发射线星系在南部领域的哈勃太空望远镜PEARS（探测演化和再电离光谱）棱晶调查。PEARS南场由五个ACS点（包括哈勃超深场）和G800 L棱镜组成，共120个轨道，揭示了天空GOODS-South区域中数千个微弱的物体光谱。发射线星系（ELG）是棱镜光谱中普遍存在的天体的一个子集。使用二维检测和提取程序，我们发现320条发射线起源于192个星系内的226个星系“结”。线识别的结果在118个新的灰色光谱红移星系在GOODS南领域。我们使用标准高斯拟合技术测量发射线通量。在棱镜数据的分辨率下，H-β和[OIII]双峰混合。然而，通过将两个高斯分量拟合到H-β和[OIII]特征，我们发现许多PEARS ELG与其他具有可比光度的星系样本相比具有较高的[OIII]/H-β比率。本文给出了ELG的恒星形成率（SFR），以及在z~0.1-0.5范围内各个星系中不同的巨星形成区的样本。我们发现，这些HII区域的径向距离一般驻留在星系的光学连续半光半径附近，类似于本地星系中的巨型HII区域。
英文摘要：
We present results of a search for emission-line galaxies in the Southern Fields of the Hubble Space Telescope PEARS (Probing Evolution And Reionization Spectroscopically) grism survey. The PEARS South Fields consist of five ACS pointings (including the Hubble Ultra Deep Field) with the G800L grism for a total of 120 orbits, revealing thousands of faint object spectra in the GOODS-South region of the sky. Emission-line galaxies (ELGs) are one subset of objects that are prevalent among the grism spectra. Using a 2-dimensional detection and extraction procedure, we find 320 emission lines orginating from 226 galaxy "knots'' within 192 individual galaxies. Line identification results in 118 new grism-spectroscopic redshifts for galaxies in the GOODS-South Field. We measure emission line fluxes using standard Gaussian fitting techniques. At the resolution of the grism data, the H-beta and [OIII] doublet are blended. However, by fitting two Gaussian components to the H-beta and [OIII] features, we find that many of the PEARS ELGs have high [OIII]/H-beta ratios compared to other galaxy samples of comparable luminosities. The star-formation rates (SFRs) of the ELGs are presented, as well as a sample of distinct giant star-forming regions at z~0.1-0.5 across individual galaxies. We find that the radial distances of these HII regions in general reside near the galaxies' optical continuum half-light radii, similar to those of giant HII regions in local galaxies.
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