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arXiv 2403.02111astro-ph.COastro-ph.GA
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GASP巡天中星系团内冲压剥离星系的径向轨道

The radial orbits of ram-pressure-stripped galaxies in clusters from the GASP survey

A. Biviano, B. M. Poggianti, Y. Jaffé, A. C. C. Lourenço, L. Pizzuti, A. Moretti, B. Vulcani

AI总结:

该研究通过叠加GASP巡天62个近邻星系团样本,并用MAMPOSSt与Jeans反演求解Jeans方程,发现冲压剥离星系轨道从中心近各向同性变为维里半径处强径向。

摘要:

我们分析了62个近邻星系团维里半径内244个冲压剥离候选星系成员的样本,以测定其速度各向异性剖面β(r)。我们利用此前已确定的这62个星系团的质量剖面,通过在投影相空间中叠加62个星系团样本来构建一个集成星系团。我们采用MAMPOSSt和Jeans反演技术两种方法求解动力学平衡的Jeans方程,并分别以参数化和非参数化形式确定β(r)。两种方法一致表明,冲压剥离候选星系的轨道随着远离星系团中心而越来越趋于径向:在中心处几乎各向同性(β≈0),到维里半径处则非常径向(β≈0.7)。正在经历冲压剥离的星系团星系的轨道与旋涡星系团星系相似,但在大半径处更沿径向拉长。

英文摘要:

We analyse a sample of 244 ram-pressure-stripped candidate galaxy members within the virial radius of 62 nearby clusters, to determine their velocity anisotropy profile $β(r)$. We use previously determined mass profiles for the 62 clusters to build an ensemble cluster by stacking the 62 cluster samples in projected phase-space. We solve the Jeans equation for dynamical equilibrium by two methods, MAMPOSSt and the Jeans inversion technique, and determine $β(r)$ both in parametric form and non-parametrically. The two methods consistently indicate that the orbits of the ram-pressure-stripped candidates are increasingly radial with distance from the cluster center, from almost isotropic ($β\simeq 0$) at the center, to very radial at the virial radius ($β\simeq 0.7$). The orbits of cluster galaxies undergoing ram-pressure stripping are similar to those of spiral cluster galaxies, but more radially elongated at large radii.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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