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arXiv 1708.04526astro-ph.COastro-ph.GA
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用于暗能量调查的OzDES多光纤光谱学：三年结果和首次数据发布

OzDES multifibre spectroscopy for the Dark Energy Survey: Three year results and first data release

M. J. Childress, C. Lidman, T. M. Davis, B. E. Tucker, J. Asorey, F. Yuan, T. M. C. Abbott, F. B. Abdalla, S. Allam, J. Annis, M. Banerji, A. Benoit-Levy, S. R.… 展开作者

M. J. Childress, C. Lidman, T. M. Davis, B. E. Tucker, J. Asorey, F. Yuan, T. M. C. Abbott, F. B. Abdalla, S. Allam, J. Annis, M. Banerji, A. Benoit-Levy, S. R. Bernard, E. Bertin, D. Brooks, E. Buckley-Geer, D. L. Burke, A. Carnero Rosell, D. Carollo, M. Carrasco Kind, J. Carretero, F. J. Castander, C. E. Cunha, L. N. da Costa, C. B. D'Andrea, P. Doel, T. F. Eifler, A. E. Evrard, B. Flaugher, R. J. Foley, P. Fosalba, J. Frieman, J. Garcia-Bellido, K. Glazebrook, D. A. Goldstein, D. Gruen, R. A. Gruendl, J. Gschwend, R. R. Gupta, G. Gutierrez, S. R. Hinton, J. K. Hoormann, D. J. James, R. Kessler, A. G. Kim, A. L. King, E. Kovacs, K. Kuehn, S. Kuhlmann, N. Kuropatkin, D. J. Lagattuta, G. F. Lewis, T. S. Li, M. Lima, H. Lin, E. Macaulay, M. A. G. Maia, J. Marriner, M. March, J. L. Marshall, P. Martini, R. G. McMahon, F. Menanteau, R. Miquel, A. Moller, E. Morganson, J. Mould, D. Mudd, D. Muthukrishna, R. C. Nichol, B. Nord, R. L. C. Ogando, F. Ostrovski, D. Parkinson, A. A. Plazas, S. L. Reed, K. Reil, A. K. Romer, E. S. Rykoff, M. Sako, E. Sanchez, V. Scarpine, R. Schindler, M. Schubnell, D. Scolnic, I. Sevilla-Noarbe, N. Seymour, R. Sharp, M. Smith, M. Soares-Santos, F. Sobreira, N. E. Sommer, H. Spinka, E. Suchyta, M. Sullivan, M. E. C. Swanson, G. Tarle, S. A. Uddin, A. R. Walker, W. Wester, B. R. Zhang

备注：
Accepted for publication in MNRAS. Redshift data release is available at http://www.mso.anu.edu.au/ozdes/DR1
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摘要：

我们目前的结果为前三年的OzDES，一个为期六年的计划，以获得红移的对象在暗能量调查（DES）超新星领域使用的2dF光纤定位器和AAOmega摄谱仪的英澳望远镜。OzDES是一种多目标光谱调查，在多年基线的多个时期针对多种类型的目标，是第一个多目标光谱调查，动态地将瞬变纳入目标列表后不久，他们的发现之一。在三年结束时，OzDES已经通过光谱确认了近100颗超新星，并测量了17，000个物体的红移，包括2，566个超新星宿主的红移。我们研究了我们测量各种类型的目标红移的能力如何取决于信噪比，幅度和曝光时间，发现我们的红移成功率在信噪比为2至3/1埃箱时显着增加。我们还发现，在信号噪声与曝光时间的变化密切匹配的泊松极限堆叠曝光长达10小时。我们使用这些结果来预测整个OzDES调查的红移产量，以及其他设施，如4米多目标光谱望远镜（4 MOST），斯巴鲁总理焦点光谱仪（PFS）和Maunakea光谱探测器（MSE）的未来调查的潜在产量。这项工作标志着第一个OzDES数据发布，包括14，693个红移。OzDES的目标是获得大约5,700个超新星宿主星系红移的产量。

英文摘要：

We present results for the first three years of OzDES, a six-year programme to obtain redshifts for objects in the Dark Energy Survey (DES) supernova fields using the 2dF fibre positioner and AAOmega spectrograph on the Anglo-Australian Telescope. OzDES is a multi-object spectroscopic survey targeting multiple types of targets at multiple epochs over a multi-year baseline, and is one of the first multi-object spectroscopic surveys to dynamically include transients into the target list soon after their discovery. At the end of three years, OzDES has spectroscopically confirmed almost 100 supernovae, and has measured redshifts for 17,000 objects, including the redshifts of 2,566 supernova hosts. We examine how our ability to measure redshifts for targets of various types depends on signal-to-noise, magnitude, and exposure time, finding that our redshift success rate increases significantly at a signal-to-noise of 2 to 3 per 1-Angstrom bin. We also find that the change in signal-to-noise with exposure time closely matches the Poisson limit for stacked exposures as long as 10 hours. We use these results to predict the redshift yield of the full OzDES survey, as well as the potential yields of future surveys on other facilities such as the 4m Multi-Object Spectroscopic Telescope (4MOST), the Subaru Prime Focus Spectrograph (PFS), and the Maunakea Spectroscopic Explorer (MSE). This work marks the first OzDES data release, comprising 14,693 redshifts. OzDES is on target to obtain over a yield of approximately 5,700 supernova host-galaxy redshifts.

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