Galapagos-2/Galfitm/GAMA -星系结构的多波长测量：在现代巡天中区分球体和盘组成部分的性质
Galapagos-2/Galfitm/GAMA -- multi-wavelength measurement of galaxy structure: separating the properties of spheroid and disk components in modern surveys
摘要：
我们目前的能力Galapagos-2和Galfitm的背景下，拟合2-分量配置文件的星系，在未来的调查中提供完整的多波段，多分量拟合大样本的星系。我们发布的代码和拟合结果来自伽马调查的DR 3的234，239个对象，这是一个比以前的作品更深入的样本。我们对模拟和真实数据进行了严格的测试，并与公共目录进行了比较，以评估使用多波段数据优于单波段数据的优势。我们表明，多波段拟合使用Galfitm提供了显着的优势，当试图将星系分解成他们各自的组成部分，因为更多的数据正在使用，通过有效地能够使用的颜色信息埋在个人曝光的优势。使用模拟数据，我们发现，多波段拟合显着减少了从真正的参数值的偏差，允许组件的大小和Sérsic指数被更准确地恢复，并通过设计，约束这些参数的频带到频带的变化，以更多的物理值。在模拟和真实数据上，我们证实，与使用单波段拟合相比，2个主要组成部分的SED可以恢复到更微弱的幅度，单波段拟合倾向于恢复磁盘和凸起-平均而言-当星系变得太暗时具有相同的SED，而不是它们真正具有的不同SED。通过将我们的结果与其他拟合代码提供的结果进行比较，我们确认它们在一般情况下一致，但通过使用MegaMorph项目开发的多波段工具可以显着减少测量误差。我们的结论是，Galapagos-2和Galfitm采用的多波段拟合显着提高了星系结构参数的准确性，并使更大的样本被用于科学分析。
英文摘要：
We present the capabilities of Galapagos--2 and Galfitm in the context of fitting 2-component profiles to galaxies, on the way to providing complete multi-band, multi-component fitting of large samples of galaxies in future surveys. We release both the code and the fit results to 234,239 objects from the DR3 of the Gama survey, a sample significantly deeper than previous works. We use stringent tests on both simulated and real data, as well as comparison to public catalogues to evaluate the advantages of using multi-band over single-band data. We show that multi-band fitting using Galfitm provides significant advantages when trying to decompose galaxies into their individual constituents, as more data are being used, by effectively being able to use the colour information buried in the individual exposures to its advantage. Using simulated data, we find that multi-band fitting significantly reduces the deviations from real parameter values, allows component sizes and Sérsic indices to be recovered more accurately, and, by design, constrains the band-to-band variations of these parameters to more physical values. On both simulated and real data, we confirm that the SEDs of the 2 main components can be recovered to fainter magnitudes compared to using single-band fitting, which tends to recover disks and bulges to - on average - have identical SEDs when the galaxies become too faint, instead of the different SEDs they truly have. By comparing our results to those provided by other fitting codes, we confirm that they agree in general, but measurement errors can be significantly reduced by using the multi-band tools developed by the MegaMorph project. We conclude that the multi-band fitting employed by Galapagos-2 and Galfitm significantly improves the accuracy of structural galaxy parameters and enables much larger samples to be be used in a scientific analysis.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
