天体之战：Centaurus A与M83作为本地群类比
Tango of Titans: Centaurus A and M83 as a Local Group Analog
AI总结：
研究通过定时论证发现CenA和M83在相互下落，其质量估计与独立测量一致，揭示其作为本地群类比的潜力。
摘要：
Centaurus A（CenA）和M83构成了宇宙附近最质量巨大的星系对之一。尽管它们的观测太阳系径向速度表明运动并非明显表明相互吸引，但本研究提供了证据表明CenA和M83实际上是在向彼此下落，表现出类似于银河系和仙女座在本地群（LG）中的二元运动的动力学相互作用。利用定时论证（TA），通过AbacusSummit模拟中的类比星系对进行校准，我们估计CenA/M83系统的总质量，假设视线速度主要由向系统质心的运动主导。这导致总质量为(6.36±1.30)×10¹² M☉。推导出的质量与基于virial质量测量和K波段亮度-质量比的独立估计结果一致。共同的束缚特征和稳健的质量确定突显了CenA/M83系统作为本地群附近类比的吸引力。此外，还讨论了NGC 4945作为CenA的主要扰动者（如同大麦哲伦星云）的进一步讨论。
英文摘要：
Centaurus A (CenA) and M83 form one of the most massive galaxy pairs in the nearby Universe. Although their observed heliocentric velocities suggest motion that is not obviously indicative of mutual attraction, this work presents evidence that CenA and M83 are in fact infalling toward each other, exhibiting a dynamical interaction analogous to the binary-like motion of the Milky Way and Andromeda in the Local Group (LG). Using the Timing Argument (TA), calibrated with analog galaxy pairs from the AbacusSummit simulation, we estimate the total mass of the CenA/M83 system under the assumption that the line-of-sight (LoS) velocity is dominated by motion toward the system's barycenter. This yields a total mass of $(6.36 \pm 1.30) \cdot 10^{12}\, M_\odot$. The inferred mass agrees well with independent estimates based on virial mass measurements and $K$-band luminosity--to-mass ratios. Together, the consistent bound signature and robust mass determination highlight the CenA/M83 system as a compelling nearby analog to the LG. Further discussion of NGC 4945 as a main perturber (as the Large Magellanic Could) for the CenA is also discussed.
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