运动学波动随星系表面质量密度的变化而变化

IF 8.8 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Ze-Hao Zhong, Gang Zhao, Hans-Walter Rix, Luis C. Ho
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引用次数: 0

摘要

星系内部通常被认为是光学对称的,对于大多数大质量早型星系来说也是运动对称的。在质量较低的一端,许多星系的速度图中包含许多小斑块,导致它们的运动在小尺度上不光滑,远非对称。这些小斑块很容易被误认为是测量不确定度,并且没有得到很好的讨论。我们使用观测和数值模拟的比较来证明小斑块的存在超越了不确定性。我们首次发现涨落度与星系恒星表面质量密度有近似的逆对数关系。没有表现出明显的光学不对称性的星系之间的紧密关系表明,除了外部环境的影响外,星系中的恒星运动还具有固有的不对称性。动力学不对称的程度与宿主星系的内在性质密切相关并受其制约。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Kinematical Fluctuations Vary with Galaxy Surface Mass Density
Abstract The Galaxy inner parts are generally considered to be optically symmetric, as well as kinematically symmetric for most massive early-type galaxies. At the lower-mass end, many galaxies contain lots of small patches in their velocity maps, causing their kinematics to be nonsmooth in small scales and far from symmetry. These small patches can easily be mistaken for measurement uncertainties and have not been well discussed. We used the comparison of observations and numerical simulations to demonstrate the small patches existence beyond uncertainties. For the first time we have found that the fluctuation degrees have an approximate inverse loglinear relation with the galaxy stellar surface mass densities. This tight relation among galaxies that do not show obvious optical asymmetry that traces environmental perturbations indicates that stellar motion in galaxies has inherent asymmetry besides external environment influences. The degree of the kinetic asymmetry is closely related to and constrained by the intrinsic properties of the host galaxy.
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来源期刊
Astrophysical Journal Letters
Astrophysical Journal Letters ASTRONOMY & ASTROPHYSICS-
CiteScore
14.10
自引率
6.30%
发文量
513
审稿时长
2-3 weeks
期刊介绍: The Astrophysical Journal Letters (ApJL) is widely regarded as the foremost journal for swiftly disseminating groundbreaking astronomical research. It focuses on concise reports that highlight pivotal advancements in the field of astrophysics. By prioritizing timeliness and the generation of immediate interest among researchers, ApJL showcases articles featuring novel discoveries and critical findings that have a profound effect on the scientific community. Moreover, ApJL ensures that published articles are comprehensive in their scope, presenting context that can be readily comprehensible to scientists who may not possess expertise in the specific disciplines covered.
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