The Time-domain Spectroscopic Survey: Target Selection for Repeat Spectroscopy
The Time-domain Spectroscopic Survey: Target Selection for Repeat Spectroscopy
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DOI：
10.3847/1538-3881/aa99da
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
C. MacLeod;P. Green;S. Anderson;M. Eracleous;J. Ruan;J. Runnoe;W. Brandt;C. Badenes;J. Greene-J.
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文献类型：
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作者：
C. MacLeod;P. Green;S. Anderson;M. Eracleous;J. Ruan;J. Runnoe;W. Brandt;C. Badenes;J. Greene-J.
随着天文学家越来越多地利用时域中的信息，光谱变化特别开辟了广阔的新的研究渠道。在这里，我们描述的选择算法的所有目标的重复光谱在时域光谱调查（TDSS），扩展重子振荡光谱调查的斯隆数字巡天（SDSS）-IV的一部分。还讨论了导致这些目标选择的科学原理和技术限制。TDSS包括一个大型的“重复类星体光谱学”（RQS）计划，提供13,000个已确认的SDSS类星体的重复光谱，以及几个较小的“少历元光谱学”（FES）计划，针对特定类别的类星体以及恒星。RQS计划旨在提供一个大型而多样化的类星体数据集，用于研究类星体光谱在年时间尺度上的变化，为FES类星体计划提供比较样本，并为发现罕见的偶然事件提供机会。FES计划涵盖了类星体和恒星中的各种现象。类星体FES计划的目标是宽吸收线类星体、高信噪比的正常宽线类星体、具有双峰或非常不对称的宽发射线轮廓的类星体、双超大质量黑洞候选者和光度变化最大的类星体。强变星也是重复光谱的目标，包括许多类型的食双星系统和经典的双星，如天琴座RR。其他恒星FES计划允许光谱变化的研究活动的超冷矮星，矮碳星，和白色矮/M矮光谱双星。我们目前的例子TDSS光谱和描述预期的样本量和结果。
As astronomers increasingly exploit the information available in the time domain, spectroscopic variability in particular opens broad new channels of investigation. Here we describe the selection algorithms for all targets intended for repeat spectroscopy in the Time Domain Spectroscopic Survey (TDSS), part of the extended Baryon Oscillation Spectroscopic Survey within the Sloan Digital Sky Survey (SDSS)-IV. Also discussed are the scientific rationale and technical constraints leading to these target selections. The TDSS includes a large “repeat quasar spectroscopy” (RQS) program delivering ∼13,000 repeat spectra of confirmed SDSS quasars, and several smaller “few-epoch spectroscopy” (FES) programs targeting specific classes of quasars as well as stars. The RQS program aims to provide a large and diverse quasar data set for studying variations in quasar spectra on timescales of years, a comparison sample for the FES quasar programs, and an opportunity for discovering rare, serendipitous events. The FES programs cover a wide variety of phenomena in both quasars and stars. Quasar FES programs target broad absorption line quasars, high signal-to-noise ratio normal broad line quasars, quasars with double-peaked or very asymmetric broad emission line profiles, binary supermassive black hole candidates, and the most photometrically variable quasars. Strongly variable stars are also targeted for repeat spectroscopy, encompassing many types of eclipsing binary systems, and classical pulsators like RR Lyrae. Other stellar FES programs allow spectroscopic variability studies of active ultracool dwarf stars, dwarf carbon stars, and white dwarf/M dwarf spectroscopic binaries. We present example TDSS spectra and describe anticipated sample sizes and results.