论文标题
结构生长的组装一致性：化石与正常星系的组合
Assembly Conformity of Structure Growth: Fossil versus Normal Groups of Galaxies
论文作者
论文摘要
使用半分析方法校准了全球恒星形成历史记录和$ z = 0 $的恒星质量功能，我们试图了解最出色的缺陷星系组。我们认为这样的群体是一种化石组（FGS） - 与正常星系相比，它们较早地组装了光环和恒星质量。我们发现这些FG和正常群体之间存在一个中央的星系和卫星一致性：以前形式的中心和卫星比后者的同行更为明显。我们称这种效果为“黑物质光环”的“组装合规性”。这种效果约占FG和正常组之间出色含量差异的70％。当一组恒星形成速率被峰值红移拆分时，发现峰红移两侧的卫星光环的质量功能在FGS和正常组之间是无法区分的，表明光环组装的自相似性相对于峰值而言。由于冲压压力和气体加热引起的“重型环境”效应约占恒星含量差异的30％。尽管FG的总恒星质量低于正常组的总质量，但我们预测，FGS最亮的中央星系的质量平均高于正常组的质量。我们还预测，在FGS的中央星系中，从中心向外有负恒星年龄梯度，而正常组的人则预期相反。
Using a semi-analytic method calibrated to the global star formation history and the stellar mass function at $z=0$, we attempt to understand the most stellar deficient galaxy groups. We argue such groups are a kind of fossil group (FGs) -- in comparison to the normal groups of galaxies, they assemble both halo and stellar mass earlier. We find there is a central galaxy and satellite conformity between these FGs and normal groups: centrals and satellites in the former form earlier and more stellar deficient than their counterparts of the latter. We term this effect "Assembly Conformity" of dark matter halos. This effect accounts for about 70 percent of the difference in stellar content between FGs and normal groups. When split by the peak redshift for the star formation rate of a group, the mass functions of satellite halos on either side of the peak redshift are found to be indistinguishable between FGs and normal groups, indicating a self-similarity of halo assembly with respect to the peak. The "baryonic environmental" effect due to ram-pressure and gas heating accounts for about 30 percent of the difference in stellar content. While the total stellar mass of FGs is lower than that of normal groups, we predict that the mass of the brightest central galaxy of FGs is, on average, higher than that of normal groups. We also predict that in the central galaxies of FGs, there is a negative stellar age gradient from the center outward, where the opposite is expected for those in normal groups.
