论文标题
在$ m _ {\ rm bh} $ - $ m _ {\ rm *，sph} $和$ m _ {\ rm bh} $ - $ r _ {\ rm e，sph e，sph>
Reading the tea leaves in the $M_{\rm bh}$-$M_{\rm *,sph}$ and $M_{\rm bh}$-$R_{\rm e,sph}$ diagrams: dry and gaseous mergers with remnant angular momentum
论文作者
论文摘要
我们最近透露，凸起和椭圆星系在$ m _ {\ rm bh} $ - $ m _ {\ rm *，sph} $图中广泛定义了独特的超级线性关系，并具有较低级别的$ m _ {\ rm bh}/m _ {\ rm bh}/m _ { （破坏盘状，椭圆建造）干燥的合并。在这里，我们提出了更细微的图片。净轨道角动量无法取消的星系合并可能导致具有旋转盘的系统。涉及一个或两个螺旋星系的湿（富含气体）合并可能会发生这种情况，例如NGC〜5128，或干燥（相对较高的气体）碰撞，涉及一个或两个宽性星系，例如NGC〜5813。祖先星系和合并残余的球体和圆盘质量决定了$ m _ {\ rm bh} $ - $ m _ {\ rm *，sph} $和$ m _ {\ rm bh} $ - 我们展示了这是如何解释椭圆序列底部附近（以前排除的合并残留）刻有S0星系，以及凸起序列顶部的核心s s0星系，这两个星系都不是褪色的螺旋星系。讨论了缩放图中的不同进化途径。我们还介绍了两种椭圆形的星系类型，探索最明亮的聚类星系的位置，并在$ m _ {\ rm bh} $ - $ m _ {\ rm *，sph}，sph} $ dubram中剥离的“紧凑型椭圆形”星系，并呈现新的Merger-Built $ m _ = MM _ \ MM { *，SPH} $关系可能对研究纳米赫兹引力波有用。这项工作有效地将许多先前考虑过的离群值带入了折叠，相对于接近线性的$ m _ {\ rm bh} $ - $ m _ {\ rm *，sph} $`红色序列'与精选的凸起和椭圆形的星系修补在一起。
We recently revealed that bulges and elliptical galaxies broadly define distinct, super-linear relations in the $M_{\rm bh}$-$M_{\rm *,sph}$ diagram, with the order-of-magnitude lower $M_{\rm bh}/M_{\rm *,sph}$ ratios in the elliptical galaxies due to major (disc-destroying, elliptical-building) dry mergers. Here we present a more nuanced picture. Galaxy mergers, in which the net orbital angular momentum does not cancel, can lead to systems with a rotating disc. This situation can occur with either wet (gas-rich) mergers involving one or two spiral galaxies, e.g., NGC~5128, or dry (relatively gas-poor) collisions involving one or two lenticular galaxies, e.g., NGC~5813. The spheroid and disc masses of the progenitor galaxies and merger remnant dictate the shift in the $M_{\rm bh}$-$M_{\rm *,sph}$ and $M_{\rm bh}$-$R_{\rm e,sph}$ diagrams. We show how this explains the (previously excluded merger remnant) Sersic S0 galaxies near the bottom of the elliptical sequence and core-Sersic S0 galaxies at the top of the bulge sequence, neither of which are faded spiral galaxies. Different evolutionary pathways in the scaling diagrams are discussed. We also introduce two ellicular (ES) galaxy types, explore the location of brightest cluster galaxies and stripped `compact elliptical' galaxies in the $M_{\rm bh}$-$M_{\rm *,sph}$ diagram, and present a new merger-built $M_{\rm bh}$-$M_{\rm *,sph}$ relation which may prove helpful for studies of nanohertz gravitational waves. This work effectively brings into the fold many systems previously considered outliers with either overly massive or undermassive black holes relative to the near-linear $M_{\rm bh}$-$M_{\rm *,sph}$ `red sequence' patched together with select bulges and elliptical galaxies.
