THE GHOSTS SURVEY. I. HUBBLE SPACE TELESCOPE ADVANCED CAMERA FOR SURVEYS DATA

THE GHOSTS SURVEY. I. HUBBLE SPACE TELESCOPE ADVANCED CAMERA FOR SURVEYS DATA
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幽灵调查 I 哈勃太空望远镜先进相机用于调查数据

DOI:
10.1088/0067-0049/195/2/18
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发表时间:
2011
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
通讯作者:
Vlajić
Vlajić
中科院分区:
--
文献类型:
--
作者:
Radburn-Smith;de Jong;Bailin;Bullock;Courteau;Dalcanton;Ferguson;Goudfrooij;Holfeltz;Holwerda;Purcell;Streich;Vlajić

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我们对 GHOSTS 调查进行了概述,这是迄今为止对盘状星系外围已解决的恒星种群进行的最大研究。该样本由 17 Mpc 内的 14 个盘状星系组成,其外盘和光晕由哈勃太空望远镜高级巡天相机 (ACS) 成像。在本系列的第一篇论文中,我们描述了样本,探讨了使用已解析恒星群的好处,并讨论了我们的 ACS F606W 和 F814W 光度测定。我们使用人造星测试来评估完整性,并使用重叠区域来估计光度不确定性。完成度为 50% 时,勘测的中位深度为红巨星分支 (TRGB) 尖端以下 2.7 星等。我们利用高红移 ACS 观测的档案场全面探索和参数化来自未解决的背景星系和前景恒星的污染。如果不进行校正,这些将导致每弧秒 2 每磁力 10 次 0.65× F814W− 19.0 检测。因此,我们确定了几个通常可以去除 95% 污染物的选择标准。即使进行了这些剔除,背景星系仍然是表面亮度检测极限的一个重大限制,对于本次巡天来说,该极限通常为 V∼ 30 mag arcsec− 2。由此产生的光度目录是公开的,包含 76 个 ACS 场中的约 310 万颗恒星,主要是低消光恒星。这些区域中 TRGB 恒星的均匀星等使得星系距离估计的准确度达到 2%–7%。
We present an overview of the GHOSTS survey, the largest study to date of the resolved stellar populations in the outskirts of disk galaxies. The sample consists of 14 disk galaxies within 17 Mpc, whose outer disks and halos are imaged with the Hubble Space Telescope Advanced Camera for Surveys (ACS). In the first paper of this series, we describe the sample, explore the benefits of using resolved stellar populations, and discuss our ACS F606W and F814W photometry. We use artificial star tests to assess completeness and use overlapping regions to estimate photometric uncertainties. The median depth of the survey at 50% completeness is 2.7 mag below the tip of the red giant branch (TRGB). We comprehensively explore and parameterize contamination from unresolved background galaxies and foreground stars using archival fields of high-redshift ACS observations. Left uncorrected, these would account for 10 0.65× F814W− 19.0 detections per mag per arcsec 2. We therefore identify several selection criteria that typically remove 95% of the contaminants. Even with these culls, background galaxies are a significant limitation to the surface brightness detection limit which, for this survey, is typically V∼ 30 mag arcsec− 2. The resulting photometric catalogs are publicly available and contain some 3.1 million stars across 76 ACS fields, predominantly of low extinction. The uniform magnitudes of TRGB stars in these fields enable galaxy distance estimates with 2%–7% accuracy.
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影响因子: --
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发表时间: 2001
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