超大黑洞被发现，质量超过400亿个太阳

Black holes can get pretty big, but there's a special class that is the biggest of the big, absolute yawning monster black holes.

黑洞可能会很大，但有一种特殊的黑洞，它是那些就像张着大嘴的怪物一般的黑洞中最大的。

And astronomers seem to have found an absolute specimen, clocking in at 40 billion times the mass of the Sun.

天文学家似乎发现了这样的一个黑洞，它达到了太阳质量的400亿倍大。

It's at the centre of a galaxy called Holmberg 15A, a supergiant elliptical galaxy around 700 million light-years away, which in turn sits at the centre of the Abell 85 galaxy cluster.

它位于一个被称为霍姆伯格15A的星系中心，这是一个（距地球）约7亿光年远的超大椭圆星系，它位于阿贝尔85星系群中心。

The object is one of the biggest black holes ever found, and the biggest found by tracking the movement of the stars around it.

该目标是迄今为止发现的最大的黑洞之一，也是通过追踪它周围的恒星运动所发现的最大的黑洞。

Previous calculations based on the dynamics of the galaxy and the cluster had resulted in Holm 15A* mass estimates of up to 310 billion times the mass of the Sun.

先前根据星系和星团动态得出的计算结果显示，霍姆15A*星系可能是太阳的3100亿倍大。

However, these were all indirect measurements of the black hole. This new research marks the first direct measurement; the paper has been submitted to The Astrophysical Journal, and awaits peer review.

然而，这都是对黑洞的非直接测量。这项新研究标志着第一次直接测量的实现；而且这篇论文已提交给《天体物理期刊》，目前在等待同行的评审。

"We use orbit-based, axisymmetric Schwarzschild models to analyse the stellar kinematics of Holm 15A from new high-resolution, wide-field spectral observations obtained with MUSE at the VLT. We find a supermassive black hole (SMBH) with a mass of (4.0 ± 0.80) × 1010 solar masses at the center of Holm 15A," the researchers wrote in their paper.

“根据用超大望远镜通过MUSE软件获取的新的高分辨率广角光谱观测结果，我们用基于轨道的轴对称施瓦西模型来分析霍姆15A星系的恒星运动学特性。我们发现了一个超级大的黑洞（SMBH），它位于霍姆15A星系的中心，是太阳的 (4.0 ± 0.80) × 1010倍大，”研究人员在论文中写道。

"This is the most massive black hole with a direct dynamical detection in the local Universe."

“这是在局部宇宙中通过直接动力检测发现的最大的黑洞。”