论文标题

凸耳星系的当今球状星系学来自电子模拟及其与星系组装历史的关系

The present-day globular cluster kinematics of lenticular galaxies from the E-MOSAICS simulations and their relation to the galaxy assembly histories

论文作者

Dolfi, Arianna, Pfeffer, Joel, Forbes, Duncan A., Couch, Warrick J., Bekki, Kenji, Brodie, Jean P., Romanowsky, Aaron J., Kruijssen, J. M. Diederik

论文摘要

我们研究了来自E-Mosaics Galaxy形成模拟的50个凸线(S0)星系的样本中,研究了球状簇(GC)系统的当今旋转速度($ V_ {ROT} $)和球状集群(GC)系统的速度分散液($σ$)。我们发现82%的星系具有GC沿着星系的光度主要轴($对齐$)旋转的GC,而其余的18%的星系没有($未对准$)。这通常与Sluggs调查的观察结果一致。对于$对齐的$ $ agalaxies,根据$ v_ {rot}/σ$ profiles to to to to to to Proge v_ progiles,我们找不到这些明确的相关性,我们找不到这些明确的相关性,我们找不到这些当前日$ v _}/et pifiels of v _} $ v _}/c,$ v _} $ v_}/cgery nistion clage $ v _ S0星系,与先前对星系星的模拟不同。 For just over half of the $misaligned$ galaxies, we find that the GC misalignment is the result of a major merger within the last 10 Gyr so that the $ex$-$situ$ GCs are misaligned by an angle between 0° (co-rotation) to 180° (counter-rotation) with respect to the $in$-$situ$ GCs, depending on the orbital configuration of the merging galaxies.对于剩余的$未对准的$星系,我们建议在早期形成的$ $ $ situ $ situ $ situ $ situ $金属罚款GC经历了比$ - $ - $ $ $金属富含GCS的$ $ themation Kinematic扰动。我们还发现,从3D相位图中的星系中心,GCS提早积聚,$ $ - $ situ $ gcs主要位于0.2病毒半径($ r_ {200} $)之内。

We study the present-day rotational velocity ($V_{rot}$) and velocity dispersion ($σ$) profiles of the globular cluster (GC) systems in a sample of 50 lenticular (S0) galaxies from the E-MOSAICS galaxy formation simulations. We find that 82% of the galaxies have GCs that are rotating along the photometric major axis of the galaxy ($aligned$), while the remaining 18% of the galaxies do not ($misaligned$). This is generally consistent with the observations from the SLUGGS survey. For the $aligned$ galaxies, classified as $peaked$ $and$ $outwardly$ $decreasing$ (49%), $flat$ (24%) and $increasing$ (27%) based on the $V_{rot}/σ$ profiles out to large radii, we do not find any clear correlation between these present-day $V_{rot}/σ$ profiles of the GCs and the past merger histories of the S0 galaxies, unlike in previous simulations of galaxy stars. For just over half of the $misaligned$ galaxies, we find that the GC misalignment is the result of a major merger within the last 10 Gyr so that the $ex$-$situ$ GCs are misaligned by an angle between 0° (co-rotation) to 180° (counter-rotation) with respect to the $in$-$situ$ GCs, depending on the orbital configuration of the merging galaxies. For the remaining $misaligned$ galaxies, we suggest that the $in$-$situ$ metal-poor GCs, formed at early times, have undergone more frequent kinematic perturbations than the $in$-$situ$ metal-rich GCs. We also find that the GCs accreted early and the $in$-$situ$ GCs are predominantly located within 0.2 virial radii ($R_{200}$) from the centre of galaxies in 3D phase-space diagrams.

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