论文标题
用像素颜色标记图测量恒星的形成历史，距离和金属性图II：应用于附近的椭圆星系
Measuring Star Formation Histories, Distances, and Metallicities with Pixel Color-Magnitude Diagrams II: Applications to Nearby Elliptical Galaxies
论文作者
论文摘要
我们介绍了恒星形成历史（SFHS），金属性和附近三个椭圆形星系中的距离以及使用像素颜色 - 磁性图（PCMD）技术得出的M31的距离的空间分辨测量。我们从Archival $ \ textit {Hst} $ M87，M49，NGC 3377和M31的PCMD计算PCMD，并使用新代码$ \ texttt {pcmdpy} $适合数据。我们测量到准确至$ \ sim 10 \％$的每个系统的距离。回收的非参数SFHS位置合理（$ \ pm 1 $ dex）对M31和NGC 3377中最近（<2 Gyr）的恒星形成的约束，这两者都显示了内而外增长的证据。 M87和M49中的SFH仅在最古老的年龄受到限制。 PCMD技术是研究附近宇宙的进化史的有希望的新途径，并且与现有的恒星种群建模技术高度互补。
We present spatially-resolved measurements of star formation histories (SFHs), metallicities, and distances in three nearby elliptical galaxies and the bulge of M31 derived using the pixel color-magnitude diagram (pCMD) technique. We compute pCMDs from archival $\textit{HST}$ photometry of M87, M49, NGC 3377 and M31, and fit the data using the new code $\texttt{PCMDPy}$. We measure distances to each system that are accurate to $\sim 10\%$. The recovered non-parametric SFHs place reasonable ($\pm 1$ dex) constraints on the recent (< 2 Gyr) star formation in M31 and NGC 3377, both of which show evidence of inside-out growth. The SFHs in M87 and M49 are constrained only at the oldest ages. The pCMD technique is a promising new avenue for studying the evolutionary history of the nearby universe, and is highly complementary to existing stellar population modeling techniques.
