论文标题
一个基于晕晕的自校准的小组查找器：SDS的应用
A Self-Calibrating Halo-Based Group Finder: Application to SDSS
论文作者
论文摘要
我们将新的Galaxy组发现器应用于SDSS的主要星系样品。该算法引入了新的自由，将光环分配给星系中，这些星系通过将目录与互补数据进行比较而自校准。这些包括来自深层成像数据的总卫星光度的星系聚类数据和测量。我们提出了有关星系式连接的限制，以进行星形和静止的种群。自校准的组目录的结果在几种关键方面有所不同，与以前的组目录和光晕占用分析不同。过渡光环质量尺度，其中一半的光晕含有静态中央星系，在M_H〜10^12.4 msol/h处，明显高于其他约束。此外，从主要的恒星光环到静态光环的宽度发生在光环质量的较窄范围内。低质量光环中的静置中央星系比同一光环质量的星形形成中心明显高得多，但这种差异逆转过渡光环质量。我们发现，在固定M_H处的LogM*中的散射对于大量晕圈的差异为〜0.2 DEX，与以前的估计相一致，但在较低的光环质量下急剧上升。组目录分配的光环质量与恒星形成和静止的中央星系的镜头估计较弱相吻合。我们讨论了对数据的第一个应用程序明确对算法的可能改进。该集团目录已公开可用。
We apply a new galaxy group finder to the Main Galaxy Sample of the SDSS. This algorithm introduces new freedom to assign halos to galaxies that is self-calibrated by comparing the catalog to complementary data. These include galaxy clustering data and measurements of the total satellite luminosity from deep imaging data. We present constraints on the galaxy-halo connection for star-forming and quiescent populations. The results of the self-calibrated group catalog differ in several key ways from previous group catalogs and halo occupation analyses. The transition halo mass scale, where half of halos contain quiescent central galaxies, is at M_h~10^12.4 Msol/h, significantly higher than other constraints. Additionally, the width of the transition from predominantly star-forming halos to quiescent halos occurs over a narrower range in halo mass. Quiescent central galaxies in low-mass halos are significantly more massive than star-forming centrals at the same halo mass, but this difference reverses above the transition halo mass. We find that the scatter in logM* at fixed M_h is ~0.2 dex for massive halos, in agreement with previous estimates, but rises sharply at lower halo masses. The halo masses assigned by the group catalog are in good agreement with weak lensing estimates for star-forming and quiescent central galaxies. We discuss possible improvements to the algorithm made clear by this first application to data. The group catalog is made publicly available.
