标题： 基于高分辨率银河光谱的最大后验恒星含量和动力学特性 显示英文标题

标题： STEllar Content and Kinematics from high resolution galactic spectra via Maximum A Posteriori

摘要： 我们引入了 STECKMAP（通过最大后验概率推断恒星内容和运动学），这是一种从积分光谱同时恢复星系运动学特性和恒星构成的方法。 它是 STECMAP（astro-ph/0505209）的扩展，适用于一般情况，即底层恒星的速度分布也是未知的。 %可以作为分析大量数据集的工具直接使用。 恒星年龄分布、年龄-金属丰度关系以及视线速度分布（LOSVD）的重建都是非参数化的，即没有假设特定的形状。 我们使用的唯一先验条件是正定性和解足够光滑的要求。 平滑参数可以通过广义交叉验证（GCV）根据数据中的噪声水平来设置，以避免过度解读。 我们使用来自 PEGASE-HR 的单星族（SSP）模型（R=10000，波长范围 4000-6800 Å，Le Borgne 等人，2004年）通过现实模拟测试该方法。 LOSVD 中的非高斯性可以用信噪比低至每 0.2 Å 像素 20 的数据可靠地恢复。 结果表明，同时恢复运动学分布不会降低恒星构成的恢复质量，因此 Ocvirk 等人（2005年）在 STECKMAP 中提供的年龄分辨率和误差估计仍然适用。 我们还探讨了与年龄相关的运动学情况（即每个恒星组分有自己的 LOSVD）。 我们从高质量伪数据（每像素 SNR=100，R=10000）中分离理想化简化螺旋星系的核球和盘面成分，并约束两个成分的运动学（平均投影速度、投影速度弥散）和年龄。 显示英文摘要

摘要： We introduce STECKMAP (STEllar Content and Kinematics via Maximum A Posteriori), a method to recover the kinematical properties of a galaxy simultaneously with its stellar content from integrated light spectra. It is an extension of STECMAP (astro-ph/0505209) to the general case where the velocity distribution of the underlying stars is also unknown. %and can be used as is for the analysis of large sets of data. The reconstructions of the stellar age distribution, the age-metallicity relation, and the Line-Of-Sight Velocity Distribution (LOSVD) are all non-parametric, i.e. no specific shape is assumed. The only a propri we use are positivity and the requirement that the solution is smooth enough. The smoothness parameter can be set by GCV according to the level of noise in the data in order to avoid overinterpretation. We use single stellar populations (SSP) from PEGASE-HR (R=10000, lambda lambda = 4000-6800 Angstrom, Le Borgne et al. 2004) to test the method through realistic simulations. Non-Gaussianities in LOSVDs are reliably recovered with SNR as low as 20 per 0.2 Angstrom pixel. It turns out that the recovery of the stellar content is not degraded by the simultaneous recovery of the kinematic distribution, so that the resolution in age and error estimates given in Ocvirk et al. 2005 remain appropriate when used with STECKMAP. We also explore the case of age-dependent kinematics (i.e. when each stellar component has its own LOSVD). We separate the bulge and disk components of an idealized simplified spiral galaxy in integrated light from high quality pseudo data (SNR=100 per pixel, R=10000), and constrain the kinematics (mean projected velocity, projected velocity dispersion) and age of both components.