The Number of Dwarf Satellites of Disk Galaxies versus their Bulge Mass in the Standard Model of Cosmology
The Number of Dwarf Satellites of Disk Galaxies versus their Bulge Mass in the Standard Model of Cosmology
复制标题
宇宙学标准模型中盘星系矮卫星数量与核球质量的关系
DOI：
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发表时间：
2018
影响因子：
4.9
通讯作者：
A. Molaeinezhad
中科院分区：
文献类型：
--
作者：
B. Javanmardi;Mojtaba Raouf;H. Khosroshahi;S. Tavasoli;O. Müller;A. Molaeinezhad
本星系群 (LG) 的三个主要星系 M31、银河系 (MW) 和 M33 的核球质量与其矮椭球星系的数量之间存在相关性。 LG 之外具有类似光度的螺旋星系也有类似的相关性。在标准的分层星系形成中，这些相关性似乎并不符合预期。在本文中，我们首次使用基于千年二号模拟的星系目录，对宇宙学标准模型对这种可能关系的期望进行了定量研究。我们的主要样本由晕中心的盘状星系组成，其维里质量范围类似于 M33、MW 和 M31。对于此样本，我们发现平均趋势（尽管分散程度非常大）与 LG 中观察到的趋势相似；较重晕中的盘状星系平均拥有较重的核球和更多数量的卫星。此外，我们研究了具有非常相似的恒星或晕质量（但核球质量跨越 2-3 个数量级）的盘状星系的子样本，发现卫星数量与核球质量之间没有明显的趋势。我们的结论是，虽然对于较宽的星系质量范围，存在一种关系（这似乎是卫星数量与晕质量相关性的体现），但对于较窄的范围，标准模型中的卫星数量和核球质量之间没有关系。需要进一步的研究来更好地理解标准模型对这种可能关系的期望。
There is a correlation between the bulge mass of the three main galaxies of the Local Group (LG), i.e., M31, Milky Way (MW), and M33, and the number of their dwarf spheroidal galaxies. A similar correlation has also been reported for spiral galaxies with comparable luminosities outside the LG. These correlations do not appear to be expected in standard hierarchical galaxy formation. In this paper, and for the first time, we present a quantitative investigation of the expectations of the standard model of cosmology for this possible relation using a galaxy catalog based on the Millennium-II simulation. Our main sample consists of disk galaxies at the centers of halos with a range of virial masses similar to M33, MW, and M31. For this sample, we find an average trend (though with very large scatter) similar to that observed in the LG; disk galaxies in heavier halos on average host heavier bulges and a larger number of satellites. In addition, we study sub-samples of disk galaxies with very similar stellar or halo masses (but spanning a range of 2–3 orders of magnitude in bulge mass) and find no obvious trend in the number of satellites versus bulge mass. We conclude that, while for a wide galaxy mass range a relation arises (which seems to be a manifestation of the satellite number–halo mass correlation), for a narrow range there is no relation between number of satellites and bulge mass in the standard model. Further studies are needed to better understand the expectations of the standard model for this possible relation.
影响因子：
4.8
作者：
E. Garaldi;E. Romano-D'iaz;M. Borzyszkowski;C. Porciani
通讯作者：
E. Garaldi;E. Romano-D'iaz;M. Borzyszkowski;C. Porciani
米拉赫妖精：仙女座星系背后的矮椭球星系的发现
影响因子：
6.5
作者：
Martínez-Delgado, David;Grebel, Eva K.;Javanmardi, Behnam;Boschin, Walter;Longeard, Nicolas;Carballo-Bello, Julio A.;Makarov, Dmitry;Beasley, Michael A.;Donatiello, Giuseppe;Haynes, Martha P.
通讯作者：
Haynes, Martha P.
影响因子：
64.8
作者：
M. Vogelsberger;S. Genel;V. Springel;P. Torrey;D. Sijacki;Da Xu;G. Snyder;Simeon Bird;D. Nelson;Lars Hernquist Mit;HarvardCfA;Hits;I. Cambridge;Stsci;Ias Princeton
通讯作者：
M. Vogelsberger;S. Genel;V. Springel;P. Torrey;D. Sijacki;Da Xu;G. Snyder;Simeon Bird;D. Nelson;Lars Hernquist Mit;HarvardCfA;Hits;I. Cambridge;Stsci;Ias Princeton