PMAS observing run at Calar Alto 3.5m Telescope: Spectroscopic surface brightness fluctuations: pilot study in M31

在 Calar Alto 3.5m 望远镜上运行 PMAS 观测：光谱表面亮度波动：M31 的试点研究

• 批准号: 247977503
• 负责人: Professor Dr. Martin Matthias Roth
• 金额: --
• 依托单位: Leibniz-Institut für Astrophysik Potsdam (AIP)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/247977503?language=en
• 关键词: PMAS; observing; run; Calar; Alto

The level of graininess in images of unresolved stellar populations in nearby galaxies can be quantified in terms of the power spectrum of spatial frequencies in direct images. The smoother the surface brightness, the more distant is, in principle, a given galaxy. This principle has been exploited successfully as an extragalactic distance estimator, known as the SBF method. We propose to revert the principle and explore the grainy appearance of surface brightness distributions in datacubes from galaxies at known distance as an innovative diagnostic tool for stellar populations.

根据直接图像中空间频率的功率谱，可以量化附近星系中未分解的恒星群图像中的颗粒级。表面亮度越平滑，原则上一个给定星系的距离就越远。这一原理已经被成功地用作河外距离估计器，被称为SBF方法。我们建议恢复这一原理，并探索已知距离的星系数据立方体中表面亮度分布的颗粒状外观，作为一种创新的恒星群诊断工具。