The SDSS-IV Mapping Nearby Galaxies at APO (MaNGA) program has been operating from 2014-2020, and has now observed a sample of 9,269 galaxies in the low redshift universe (z ~ 0.05) with integral-field spectroscopy. With rest-optical (\lambda\lambda 0.36 - 1.0 um) spectral resolution R ~ 2000 the instrumental spectral line-spread function (LSF) typically has 1sigma width of about 70 km/s, which poses a challenge for the study of the typically 20-30 km/s velocity dispersion of the ionized gas in present-day disk galaxies. In this contribution, we present a major revision of the MaNGA data pipeline architecture, focusing particularly on a variety of factors impacting the effective LSF (e.g., undersampling, spectral rectification, and data cube construction). Through comparison with external assessments of the MaNGA data provided by substantially higher-resolution R ~ 10,000 instruments we demonstrate that the revised MPL-10 pipeline measures the instrumental line spread function sufficiently accurately ( 50. Velocity dispersions derived from [O II], Hbeta, [O III], [N II], and [S II] are consistent with those derived from Halpha to within about 2% at sigma_Halpha > 30 km/s. Although the impact of these changes to the estimated LSF will be minimal at velocity dispersions greater than about 100 km/s, scientific results from previous data releases that are based on dispersions far below the instrumental resolution should be reevaulated.

中文翻译：

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SDSS-IV MaNGA：将谱线扩展函数建模为亚百分比精度

APO (MaNGA) 计划的 SDSS-IV 附近星系测绘计划从 2014 年到 2020 年一直在运行，现在已经使用积分场光谱观测了低红移宇宙 (z ~ 0.05) 中的 9,269 个星系样本。其余光学 (λλ 0.36 - 1.0 um) 光谱分辨率 R ~ 2000 仪器光谱线扩展函数 (LSF) 通常具有约 70 km/s 的 1sigma 宽度，这对典型的研究提出了挑战现今盘状星系中电离气体的 20-30 km/s 速度弥散。在这篇文章中，我们提出了 MaNGA 数据管道架构的重大修订，特别关注影响有效 LSF 的各种因素（例如，欠采样、光谱校正和数据立方体构造）。源自 [O II]、Hbeta、[O III]、[N II] 和 [S II] 的速度色散与源自 Halpha 的速度色散一致，在 sigma_Halpha > 30 km/s 时约为 2%。尽管这些变化对估计的 LSF 的影响在速度弥散大于 100 公里/秒时将是最小的，但应重新评估先前基于远低于仪器分辨率的弥散的数据发布的科学结果。源自 [O II]、Hbeta、[O III]、[N II] 和 [S II] 的速度色散与源自 Halpha 的速度色散一致，在 sigma_Halpha > 30 km/s 时约为 2%。尽管这些变化对估计的 LSF 的影响在速度弥散大于 100 公里/秒时将是最小的，但应重新评估先前基于远低于仪器分辨率的弥散的数据发布的科学结果。