On the fate of processed matter in dwarf galaxies
On the fate of processed matter in dwarf galaxies
复制标题
关于矮星系中经过处理的物质的命运
DOI：
10.1046/j.1365-8711.1998.01765.x
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发表时间：
1998
影响因子：
4.8
通讯作者：
G. Tenorio
中科院分区：
文献类型：
--
作者：
S. Silich;G. Tenorio
本文对矮星系（M_（109-1010）M_（109-1010）M_（109-1010））中星团强机械能沉积产生的残余物演化进行了二维计算。演化的时间比井喷时间和假定的能量注入跨度都要长，这是由一个同时代的大质量恒星团产生的。这些残余物最终会缠绕在宿主星系的中心区域，同时会增长到千秒差距尺度。剩余物的性质，如光度，大小，扫起的质量和膨胀速度作为时间的函数给出所有计算的情况下。 最终的命运席卷了银河系气体和中央星暴处理的物质被证明是高度依赖于低密度星系晕的属性。由星星团提供动力的超级气泡具有与从观察中推断的性质相似的性质，在存在扩展晕的情况下会减慢至小于宿主星系逃逸速度的膨胀速度。通过解析和数值计算得到了超气泡以与逃逸速度相当的速度到达星系边缘所需的临界光度值。临界光度比探测到的源大，因此无定形矮星系中的超级气泡必须已经经历了井喷，目前正在演变成一个扩展的低密度晕。这将抑制星系中被扫起和处理过的物质的损失。
Two-dimensional calculations of the evolution of remnants generated by the strong mechanical energy deposited by stellar clusters in dwarf galaxies (M ∼ 109–1010 M⊙) are presented. The evolution is followed for times longer than both the blowout time and the presumed span of energy injection generated by a coeval massive stellar cluster. The remnants are shown to end up wrapping around the central region of the host galaxy, while growing to kiloparsec-scale dimensions. Properties of the remnants such as luminosity, size, swept-up mass and expansion speed are given as functions of time for all calculated cases. The final fate of the swept-up galactic gas and of the matter processed by the central starburst is shown to be highly dependent on the properties of the low-density galactic halo. Superbubbles powered by star clusters, with properties similar to those inferred from the observations, slow down in the presence of an extended halo to expansion speeds smaller than the host galaxy escape velocity. Values of the critical luminosity required for the superbubbles to reach the edge of the galaxies with a speed comparable to the escape speed are derived analytically and numerically. The critical luminosities are larger than those in the detected sources, and thus the superbubbles in amorphous dwarf galaxies must have already undergone blowout and are presently evolving into an extended low-density halo. This will inhibit the loss of the swept-up and processed matter from the galaxy.