Ram-Pressure Stripping of Galaxies in High-Redshift Clusters and the Influence of Intracluster Medium Heating
Ram-Pressure Stripping of Galaxies in High-Redshift Clusters and the Influence of Intracluster Medium Heating
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高红移星团中星系的冲压压力剥离及星团内介质加热的影响
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发表时间：
2000
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通讯作者：
Y. Fujita
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作者：
Y. Fujita
我们已经调查了在不同的红移和在集群的祖先星系团盘星系的冲压压力剥离，集群是通过一个层次聚类的情况下形成的。我们考虑一个径向下落的星系，其初始位置和速度由结构形成的球形坍缩模型给出。此外，由于观测结果表明，附近星系团的团内介质（ICM）是非引力加热的，我们研究了非引力加热对冲压压力剥离的影响。对于给定的红移，我们发现在质量较大的星系团中，冲压压力剥离对星系的影响更大。另一方面，对于一个给定的质量，它有更多的影响星系团在高红移。特别是，我们预测，在丰富的星系团在z = 1，大多数星系的影响，冲压压力剥离。虽然非引力加热显著降低了质量小于× 1013 M的星系团中的冲压压力剥离的影响，但它不会影响更丰富的星系团的影响。如果ICM在z = 1时被非重力加热，那么在z = 1-2时，在0 ° z = 0.5时观察到的团簇的祖细胞中不会发生冲压压力剥离，因为热量使团簇祖细胞中的ICM部分变小。另一方面，如果ICM在z ~ 0处第一次非重力加热，则即使在z ~ 3处也会发生冲压压力剥离。我们比较的结果与星系团在不同的红移观测。
We have investigated the ram-pressure stripping of disk galaxies in clusters at various redshifts and in cluster progenitors; the clusters are formed via a hierarchical clustering scenario. We consider a radially infalling galaxy whose initial position and velocity are given by a spherical collapse model of structure formation. Moreover, since observations show that the intracluster medium (ICM) of nearby clusters is nongravitationally heated, we study the effect of the nongravitational heating on the ram-pressure stripping. For a given redshift, we find that ram-pressure stripping has more influence on galaxies in more massive clusters. On the other hand, for a given mass, it has more influence on galaxies in clusters at higher redshifts. In particular, we predict that in rich clusters at z ≳ 1, most of the galaxies are affected by ram-pressure stripping. While the nongravitational heating significantly reduces the influence of ram-pressure stripping on galaxies in clusters with a mass smaller than × 1013 M ☉, it does not affect the influence in richer clusters. If the ICM is heated nongravitationally at z ≫ 1, ram-pressure stripping does not occur at z ~ 1-2 in the progenitors of clusters observed at 0 ≲ z ≲ 0.5 because the heat makes the ICM fraction of the cluster progenitors small. On the other hand, if the ICM is heated nongravitationally at z ~ 0 for the first time, the ram-pressure stripping occurs even at z ~ 3. We compare the results with the observations of galaxies in clusters at various redshifts.