arXiv 1407.52372014-07astro-ph.IMastro-ph.GA

SAMI星系巡天：立体主义和协方差，把圆钉放进方孔

The SAMI Galaxy Survey: Cubism and covariance, putting round pegs into square holes

R. Sharp, J. T. Allen, L. M. R. Fogarty, S. M. Croom, L. Cortese, A. W. Green, J. Nielsen, S. N. Richards, N. Scott, E. N. Taylor, L. A. Barnes, A. E. Bauer, M.… 展开作者

R. Sharp, J. T. Allen, L. M. R. Fogarty, S. M. Croom, L. Cortese, A. W. Green, J. Nielsen, S. N. Richards, N. Scott, E. N. Taylor, L. A. Barnes, A. E. Bauer, M. Birchall, J. Bland-Hawthorn, J. V. Bloom, S. Brough, J. J. Bryant, G. N. Cecil, M. Colless, W. J. Couch, M. J. Drinkwater, S. Driver, C. Foster, M. Goodwin, M. L. P. Gunawardhana, I. -T. Ho, E. J. Hampton, A. M. Hopkins, H. Jones, I. S. Konstantopoulos, J. S. Lawrence, S. K. Leslie, G. F. Lewis, J. Liske, A. R. Lopez-Sanchez, N. P. F. Lorente, R. McElroy, A. M. Medling, S. Mahajan, J. Mould, Q. Parker, M. B. Pracy, D. Obreschkow, M. S. Owers, A. L. Schaefer, S. M Sweet, A. Thomas, C. Tonini, C. J. Walcher

备注：: 17 pages, 10 figures, Accepted MNRAS September 2014
DOI：: 10.1093/mnras/stu2055

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摘要：

我们提出了一种方法，稀疏采样和不规则网格化的光纤多目标积分场光谱观测的正则化和组合。该方法最大限度地减少插值，并保持图像分辨率的亚像素抖动数据相结合。我们讨论的背景下，悉尼-AAO多目标积分场摄谱仪（SAMI）银河系正在进行的英澳望远镜的方法。SAMI仪器使用13个光纤束在1度直径的视场内执行高度复用积分场光谱。SAMI星系巡天计划的目标是从所有星系环境中选取3000个星系。我们证明了亚临界采样的看到和不完整的填充因子的积分场束的结果在最终的图像分辨率恢复只有10%的退化。我们还实施了一种新的方法，用于跟踪所得到的数据立方体的元素之间的协方差，保留90%的协方差信息，而只会引起调查数据量的适度增加。

英文摘要：

We present a methodology for the regularisation and combination of sparse sampled and irregularly gridded observations from fibre-optic multi-object integral-field spectroscopy. The approach minimises interpolation and retains image resolution on combining sub-pixel dithered data. We discuss the methodology in the context of the Sydney-AAO Multi-object Integral-field spectrograph (SAMI) Galaxy Survey underway at the Anglo-Australian Telescope. The SAMI instrument uses 13 fibre bundles to perform high-multiplex integral-field spectroscopy across a one degree diameter field of view. The SAMI Galaxy Survey is targeting 3000 galaxies drawn from the full range of galaxy environments. We demonstrate the subcritical sampling of the seeing and incomplete fill factor for the integral-field bundles results in only a 10% degradation in the final image resolution recovered. We also implement a new methodology for tracking covariance between elements of the resulting datacubes which retains 90% of the covariance information while incurring only a modest increase in the survey data volume.

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