THROUGH THE LOOKING GLASS: HST SPECTROSCOPY OF FAINT GALAXIES LENSED BY THE FRONTIER FIELDS CLUSTER MACSJ0717.5+3745
THROUGH THE LOOKING GLASS: HST SPECTROSCOPY OF FAINT GALAXIES LENSED BY THE FRONTIER FIELDS CLUSTER MACSJ0717.5+3745
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透过望远镜：由前沿场星团 MACSJ0717.5 3745 透镜透镜观测的微弱星系的 HST 光谱
DOI：
10.1088/2041-8205/782/2/l36
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
B. Vulcani
中科院分区：
文献类型：
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作者：
K. Schmidt;T. Treu;G. Brammer;M. Bradač;X. Wang;M. Dijkstra;A. Dressler;A. Fontana;R. Gavazzi;A. Henry;A. Hoag;T. Jones;P. Kelly;M. Malkan;C. Mason;L. Pentericci;B. Poggianti;M. Stiavelli;M. Trenti;A. von der Linden;B. Vulcani
空间棱镜透镜放大巡天（GLASS）是哈勃太空望远镜（HST）的一个大型计划，它将获得10个星系团核心和下落区域的140个轨道的棱镜光谱，被选为最好的宇宙望远镜之一。广泛的HST成像可从许多来源获得，包括CLASH和Frontier Fields计划。我们通过分析从14个轨道中的前7个轨道获得的微弱的多重成像星系和z 106星系候选者的光谱来介绍这一调查，这些轨道针对前沿场星系团MACSJ0717.5+3745的核心。我们用G102和G141光栅覆盖0.8-1.7 μm波长范围，通过检测每个图像中的发射线，确认了四个强透镜系统。对于没有污染的9 z 6候选星系，我们没有探测到任何低至1.5 × 10−18 erg s−1 cm−2的7轨道1σ噪声水平的发射谱线。考虑到透镜放大率，我们的通量灵敏度达到10.2 -5 × 10−18 erg s−1cm−2。这些在不间断波长范围内的限制排除了高z星系候选者是较低红移的强线发射体的可能性。这些结果表明，通过仔细建模的背景，并与透镜放大的协助下，有趣的通量限制，可以达到大量的对象，避免预先选择和固有的地基多缝光谱的波长限制。这些观测结果证实了无狭缝HST光谱的能力，即使在拥挤的集群核心领域。
The Grism Lens-Amplified Survey from Space (GLASS) is a Hubble Space Telescope (HST) Large Program, which will obtain 140 orbits of grism spectroscopy of the core and infall regions of 10 galaxy clusters, selected to be among the very best cosmic telescopes. Extensive HST imaging is available from many sources including the CLASH and Frontier Fields programs. We introduce the survey by analyzing spectra of faint multiply-imaged galaxies and z ≳ 6 galaxy candidates obtained from the first 7 orbits out of 14 targeting the core of the Frontier Fields cluster MACSJ0717.5+3745. Using the G102 and G141 grisms to cover the wavelength range 0.8–1.7 μm, we confirm four strongly lensed systems by detecting emission lines in each of the images. For the 9 z ≳ 6 galaxy candidates clear from contamination, we do not detect any emission lines down to a 7 orbit 1σ noise level of ∼5 × 10−18 erg s−1 cm−2. Taking lensing magnification into account, our flux sensitivity reaches ∼0.2–5 × 10−18 erg s−1cm−2. These limits over an uninterrupted wavelength range rule out the possibility that the high-z galaxy candidates are instead strong line emitters at lower redshift. These results show that by means of careful modeling of the background—and with the assistance of lensing magnification—interesting flux limits can be reached for large numbers of objects, avoiding pre-selection and the wavelength restrictions inherent to ground-based multi-slit spectroscopy. These observations confirm the power of slitless HST spectroscopy even in fields as crowded as a cluster core.
WFC3 红外光谱平行 (WISP) 调查
DOI：
10.1088/0004-637x/723/1/104
发表时间：
2010
期刊：
The Astrophysical Journal
影响因子：
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作者：
Atek H
通讯作者：
Atek H