IAC条纹82遗产项目：微弱表面亮度天文学的广域调查
The IAC Stripe 82 Legacy Project: a wide-area survey for faint surface brightness astronomy
摘要：
我们提出了新的深度共同增加的数据条纹82的斯隆数字巡天（SDSS），特别是堆叠，以达到最微弱的表面亮度极限的数据集。条纹82覆盖-50 < RA < +60和-1.25 <Dec.<+1.25内的275平方度。我们讨论了我们的减少的步骤，特别强调使用非侵略性的天空减法策略保留输入图像中的背景（天空+漫射光）的特性。在r波段，我们的还原达到了~28.5 mag/arcsec^2（3 sigma，10 × 10 arcsec^2）的极限。有效表面亮度极限（指数光分布的50%完整性）位于<mu_e（r）> ~ 25.5 mag/arcsec ^[2]。对于点源，我们达到了（24.2，25.2，24.7，24.3，23.0）mag在（u，g，r，i，z）的50%完整性极限（3 sigma水平）。这比单历元SDSS版本的深度在1.7到2.0等之间。共加显示了点扩散函数，其中值FWHM值在i和z中的1弧秒到u带中的1.3弧秒之间。成像数据可在http://www.iac.es/proyecto/stripe82上公开获得。该版本包括每个字段的深度共同添加和PSF表示。此外，我们提供的对象目录与恒星和星系的信心，直到g~23 mag. The IAC条纹82 coadds分离提供了一个相当独特的可能性，研究低表面亮度宇宙，例如发现恒星流周围的NGC 0426和NGC 0936。我们还讨论了进一步的科学案例，如恒星晕和盘截断，低表面亮度星系，在星系团和银河尘埃的弥漫发射的星系卷云的星系团内光。
英文摘要：
We present new deep co-adds of data taken within Stripe 82 of the Sloan Digital Sky Survey (SDSS), especially stacked to reach the faintest surface brightness limits of this data set. Stripe 82 covers 275 square degrees within -50 < RA < +60 and -1.25 < Dec. < +1.25. We discuss the steps of our reduction which puts special emphasis on preserving the characteristics of the background (sky + diffuse light) in the input images using a non-aggressive sky subtraction strategy. Our reduction reaches a limit of ~28.5 mag/arcsec^2 (3 sigma, 10x10 arcsec^2) in the r band. The effective surface brightness limit (50% completeness for exponential light distribution) lies at <mu_e(r)> ~ 25.5 mag/arcsec^2. For point sources, we reach 50% completeness limits (3 sigma level) of (24.2,25.2,24.7,24.3,23.0) mag in (u,g,r,i,z). This is between 1.7 and 2.0 mag deeper than the single epoch SDSS releases. The co-adds show point spread functions with median FWHM values ranging between 1 arcsec in i and z to 1.3 arcsec in the u band. The imaging data are made publicly available at http://www.iac.es/proyecto/stripe82. The release includes deep co-adds and representations of the PSF for each field. Additionally, we provide object catalogues with stars and galaxies confidently separated until g~23 mag. The IAC Stripe 82 coadds offer a rather unique possibility to study the low surface brightness universe, exemplified by the discovery of stellar streams around NGC0426 and NGC0936. We also discuss further science cases like stellar haloes and disc truncations, low surface brightness galaxies, the intra-cluster light in galaxy clusters and the diffuse emission of Galactic dust known as Galactic Cirrus.
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