Wind from a starburst galaxy nucleus
Wind from a starburst galaxy nucleus
复制标题
来自星爆星系核的风
作者：
R. Chevalier;A. Clegg
具有高度活跃的恒星形成区的星系(星爆星系)被推断为在活动区具有高超新星速率1，2。如果大部分超新星能量输入被热化，则大风被赶出活动区。风可能是如此之快，以至于没有牵涉到引力。我们在这里给出了风的解析解，风是由均匀质量和能量沉积的区域驱动的。该解被应用于M82--观测到的最好的星暴星系。该模型可以直接与M82的气压和由射电频谱推算的风速进行比较。银河系确实有围绕盘外运行的云层。风与云的相互作用可能会引起流动运动和X射线发射。风预计会在银河系所在的任何漫射气体中形成一个洞。风可能在恒星爆发星系的演化中起着重要作用，因为它将气体从星系的中心区域转移到外部，这些气体可能是重元素丰富的。
Galaxies with highly active star formation regions (starburst galaxies) are inferred to have high supernova rates in the region of activity1,2. If most of the supernova energy input is thermalized, a strong wind is driven out of the active region. The wind is probably so fast that gravitational forces are not involved. We present here an analytical solution for the wind which is driven from a region of uniform mass and energy deposition. The solution is applied to M82—the best observed case of a starbust galaxy. The model can be directly compared with the gas pressure in M82 and with a wind velocity deduced from radio spectra. The galaxy does have clouds orbiting out of the disk. The interaction of the wind with the clouds can give rise to streaming motions and to X-ray emission. The wind is expected to create a hole in any diffuse gas in which the galaxy is embedded. The wind may have a significant role in the evolution of a starburst galaxy in that it transfers gas, which is probably heavy-element enriched, from the central regions to the outer parts of the galaxy.