IRS13 是否需要一个中等质量黑洞？
Does IRS13 require an intermediate-mass black hole?
中文总结 AI 辅助
该研究通过N体计算和模拟发现，IRS13大小的星团即使存在4×10⁴M⊙的中等质量黑洞也会快速瓦解，其观测速度弥散可由Sgr A*潮汐场及下落事件自然产生，无需假设存在中心中等质量黑洞。
中文摘要 AI 辅助
我们研究银心星协IRS13是否需要一个中等质量黑洞（IMBH）来保持束缚。通过对绕银河系超大质量黑洞（SMBH）运行的类IRS13系统进行高精度N体计算，以及对更庞大的下落星团进行模拟，我们发现即使存在质量为4×10⁴M⊙的IMBH，一个IRS13大小的星团也会在极短时间内瓦解。观测到的速度弥散可自然源自Sgr A*的潮汐场及其下落事件本身，因此它不一定意味着存在中心IMBH。在下落星团的模拟中，潮汐剥离会产生瞬态盘、类螺旋结构和类环状 overdensity。这些特征表明更广泛的解释：IRS13最好被视为一个暂时的相空间 overdensity，其机制（尽管规模不同）类似于被破坏星系中的相位包裹壳和流。
英文摘要
We investigate whether the Galactic-centre association IRS13 requires an intermediate-mass black hole (IMBH) to remain bound. Using high-precision $N$-body calculations of IRS13-like systems orbiting the Milky Way supermassive black hole (SMBH), as well as simulations of more massive infalling clusters, we find that an IRS13-sized cluster dissolves on a very short timescale even when an IMBH of $4\times10^4\,M_\odot$ is present. The observed velocity dispersion can arise naturally from the tidal field of Sgr A* and the infall event itself; therefore, it need not imply a central IMBH. In the infalling-cluster runs, tidal stripping produces transient disks, spiral-like structures, and ring-like overdensities. These features suggest a broader interpretation: IRS13 is best viewed as a temporary phase-space overdensity, analogous in mechanism (though not in scale) to phase-wrapped shells and streams in disrupted galaxies.
