▲ 摘要：在许多星系团的中心，炽热（大约107开尔文）星系团内介质可变得足够致密，以至于其本应在短时间内冷却。然而，在大质量中心星系中测量到的恒星形成率很低，且冷却气体中没有软X射线，这表明大多数气体从未冷却过。这就是所谓的冷却流问题。

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