Ring Galaxies Through Off-center Minor Collisions by Tuning Bulge-to-disk Mass Ratio of Progenitors

Ring Galaxies Through Off-center Minor Collisions by Tuning Bulge-to-disk Mass Ratio of Progenitors
复制标题

通过调整祖细胞核球与盘的质量比通过偏心小碰撞形成环形星系

DOI:
10.3847/1538-4357/aad4b2
复制
发表时间:
2018-07
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
4 more
4 more
中科院分区:
其他
文献类型:
--
作者:
Chen Guangwen;4 more

文献摘要

参考文献

相似文献

碰撞环星系(CRG)是由一个目标星系和一个入侵的矮星系之间的偏心碰撞形成的。我们通过调整前体的凸起与圆盘的质量比(B/D)来研究CRG的质量分布和运动学;即,目标星系我们发现,环的寿命与垂直于盘平面的初始撞击速度(即,v z0)。选取碰撞星系对的三个轨道,在不同的B/D值下,对碰撞星系对进行了N体模拟。研究发现,当B/D值较小时,CRG的环状结构最强.碰撞后,目标星系中心残骸的Sérsic指数n变大。此外,中心残体的Sérsic指数与祖先的B/D的初始值密切相关。一个没有膨胀的祖先会在环状星系的中心产生一个晚型的天体,而一个膨胀主导的祖先会导致一个早型的中央遗迹。具有B/D ∈ [0.1,0.3]的祖细胞(即,小凸起)留下中央残余与n.这些结果提供了一个可能的解释,最近观察到的CRG与早期型中央核,SDSS J1634+2049的形成。此外,我们还发现环星系的径向速度和方位角速度分布对B/D比原始星系的初始相对速度更敏感。
Collisional ring galaxies (CRGs) are formed through off-center collisions between a target galaxy and an intruder dwarf galaxy. We study the mass distribution and kinematics of CRGs by tuning the bulge-to-disk mass ratio (B/D) for the progenitor; i.e., the target galaxy. We find that the lifetime of the ring correlates with the initial impact velocity vertical to the disk plane (i.e., v z0). Three orbits for the collisional galaxy pair, on which clear and asymmetric rings form after collisions, are selected to perform the N-body simulations at different values of B/D for the progenitor. It is found that the ring structures are the strongest for CRGs with small values of B/D. The Sérsic index, n, of the central remnant in the target galaxy becomes larger after collision. Moreover, the Sérsic index of a central remnant strongly correlates with the initial value of B/D for the progenitor. A bulge-less progenitor results in a late-type object in the center of the ring galaxy, whereas a bulge-dominated progenitor leads to an early-type central remnant. Progenitors with B/D ∈ [0.1, 0.3] (i.e., minor bulges) leave central remnants with n ≈ 4. These results provide a possible explanation for the formation of a recently observed CRG with an early-type central nucleus, SDSS J1634+2049. In addition, we find that the radial and azimuthal velocity profiles for a ring galaxy are more sensitive to the B/D than the initial relative velocity of the progenitor.
DOI: 10.1111/j.1365-2966.2005.09976.x
发表时间: 2005-06
影响因子: 4.8
作者:
A. Macciò;B. Moore;J. Stadel;J. B. U. O. Zurich;University of California at Santa Cruz
通讯作者: A. Macciò;B. Moore;J. Stadel;J. B. U. O. Zurich;University of California at Santa Cruz
DOI: 10.1086/112324
发表时间: 1978-11
期刊: The Astronomical Journal
影响因子: --
作者:
P. Schechter;J. Gunn
通讯作者: P. Schechter;J. Gunn
DOI: 10.1086/174672
发表时间: 1994-10
期刊: The Astrophysical Journal
影响因子: --
作者:
J. Wallin;C. Struck-Marcell
通讯作者: J. Wallin;C. Struck-Marcell
DOI: 10.1086/154730
发表时间: 1976-10
期刊: The Astrophysical Journal
影响因子: --
作者:
R. Lynds;A. Toomre
通讯作者: R. Lynds;A. Toomre
DOI: --
发表时间: 2002
期刊: --
影响因子: --
作者:
通讯作者: --