标题： 通过光谱光度测量法识别的PEARS-N和PEARS-S区域中的恒星 显示英文标题

标题： Spectrophotometrically Identified stars in the PEARS-N and PEARS-S fields

摘要： 在大天文台起源深度巡天（GOODS）北场和南场的深ACS狭缝光谱仪光栅观测以及恒星源的识别被展示出来，这些数据来源于“进化与再电离探测计划”（PEARS）。研究表明，即使低分辨率光谱也可以是非常强大的工具来识别场中的恒星，尤其是具有M0及更晚型的低质量恒星。 PEARS区域位于更大的GOODS区域内，我们利用新的更深图像进一步优化了PEARS区域内的恒星选择，使用新开发的恒星性参数直至mz = 25的星等。 可靠光谱和形态学识别的恒星总数分别为北场95颗和南场108颗。 这个光谱识别恒星样本允许我们限制银河薄盘厚度以及厚盘和晕的贡献。 我们通过追踪M4到M9矮星种群沿着两个独立视线得出的薄盘标高为h_thin = 370 +60/-65 pc。 当包括更大量的M0到M4矮星时，我们得出h_thin = 300 ± 70 pc。 在这两种情况下，我们观察到为了说明观测到的微弱矮星数量，我们必须在模型中包含厚盘和晕的组合成分。 所需的厚盘标高通常为h_thick=1000 pc，并且薄盘相对于厚盘和薄盘相对于晕的相对恒星密度在0.00025<f_halo<0.0005和0.05<f_thick<0.08范围内，这在一定程度上取决于是否将更重的M0到M4矮星纳入我们的样本中。 显示英文摘要

摘要： Deep ACS slitless grism observations and identification of stellar sources are presented within the Great Observatories Origins Deep Survey (GOODS) North and South fields which were obtained in the Probing Evolution And Reionization Spectroscopically (PEARS) program. It is demonstrated that even low resolution spectra can be a very powerful means to identify stars in the field, especially low mass stars with stellar types M0 and later. The PEARS fields lay within the larger GOODS fields, and we used new, deeper images to further refine the selection of stars in the PEARS field, down to a magnitude of mz = 25 using a newly developed stellarity parameter. The total number of stars with reliable spectroscopic and morphological identification was 95 and 108 in the north and south fields respectively. The sample of spectroscopically identified stars allows constraints to be set on the thickness of the Galactic thin disk as well as contributions from a thick disk and a halo component. We derive a thin disk scale height, as traced by the population of M4 to M9 dwarfs along two independent lines of sight, of h_thin = 370 +60/-65 pc. When including the more massive M0 to M4 dwarf population, we derive h_thin = 300 +/- 70pc. In both cases, we observe that we must include a combination of thick and halo components in our models in order to account for the observed numbers of faint dwarfs. The required thick disk scale height is typically h_thick=1000 pc and the acceptable relative stellar densities of the thin disk to thick disk and the thin disk to halo components are in the range of 0.00025<f_halo<0.0005 and 0.05<f_thick<0.08 and are somewhat dependent on whether the more massive M0 to M4 dwarfs are included in our sample.