SBF：多波长数据和模型
SBF: multi-wavelength data and models
摘要：
最近的应用已经证明，表面亮度波动（SBF）技术是一个可靠的距离指标，在很宽的距离范围内，和一个有前途的工具来分析未解决的恒星系统的物理和化学性质，在他们的金属丰度和年龄。本文介绍了利用SBF方法研究星系外恒星星族演化特征和距离的初步结果。在观测方面，我们已经成功地在六个明亮的椭圆星系中探测到了I波段的SBF梯度，对于这些相同的物体，我们现在也提供了B波段的SBF数据。这些B波段的数据是第一个超过10兆秒差距的星系波动幅度测量。为了从观测数据中分析恒星星族的性质，精确的SBF模型是必不可少的。作为这个项目的一部分，我们已经评估了简单的恒星星族（SSP）模型的SBF星等专门为此目的优化。广泛的化学成分和年龄，以及不同的光度系统的选择进行了研究。所有模型都可以在Teramo-恒星星族工具网站上找到：www.oa-teramo.inaf.it/SPoT。
英文摘要：
Recent applications have proved that the Surface Brightness Fluctuations (SBF) technique is a reliable distance indicator in a wide range of distances, and a promising tool to analyze the physical and chemical properties of unresolved stellar systems, in terms of their metallicity and age. We present the preliminary results of a project aimed at studying the evolutionary properties and distance of the stellar populations in external galaxies based on the SBF method. On the observational side, we have succeeded in detecting I-band SBF gradients in six bright ellipticals imaged with the ACS, for these same objects we are now presenting also B-band SBF data. These B-band data are the first fluctuations magnitude measurements for galaxies beyond 10 Mpc. To analyze the properties of stellar populations from the data, accurate SBF models are essential. As a part of this project, we have evaluated SBF magnitudes from Simple Stellar Population (SSP) models specifically optimized for the purpose. A wide range of chemical compositions and ages, as well as different choices of the photometric system have been investigated. All models are available at the Teramo-Stellar Populations Tools web site: www.oa-teramo.inaf.it/SPoT.
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