螺旋星系旋转曲线的最小二乘非线性回归分解

IF 1.6 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Indian Journal of Physics Pub Date : 2023-05-25 DOI:10.1007/s12648-023-02655-6

Prateek Boga, Adhitya Shreyas Sripennem, Amaria Navis Bonsi

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引用次数: 0

摘要

利用螺旋星系暗物质(DM)的navarro - frank - white密度曲线研究了冷暗物质宇宙中的暗物质质量分布。将凸出体、圆盘和DM光晕的完全旋转曲线方程结合起来，得到了完全旋转曲线方程。在MATLAB中利用最小二乘非线性算法对34个螺旋星系的RCs进行拟合和分解。记录自由参数值，计算各部件的\(\chi ^2\)值和质量。34个星系中有32个的\(\chi ^2\)值介于1和2之间，验证了RC分解的算法，并讨论了例外情况。我们还提供了所有星系的凸起、圆盘和DM光晕的旋转速度数据集(https://adhitya-spas.github.io/Database/)。

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Rotational curves decomposition of spiral galaxies using least square non-linear regression

Dark Matter mass distribution is studied in a Cold Dark Matter Universe using Navarro–Frenk–White density profile for Dark Matter (DM) in spiral galaxies. An equation for a complete rotation curve (RC) is obtained by combining the individual RC equations for the bulge, disk and DM halo. The equation is further used for fitting and decomposition of the RCs of 34 spiral galaxies using a Least Square non-linear algorithm in MATLAB. The free parameters’ values are recorded, \(\chi ^2\) values and masses of each component are calculated. 32 of 34 galaxies yield a \(\chi ^2\) value between 1 and 2 validating the algorithm for the purpose of RC decomposition and the exceptions are discussed. We also present the rotational velocity dataset for the bulge, disk and DM halo for all galaxies (https://adhitya-spas.github.io/Database/).

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来源期刊

Indian Journal of Physics 物理-物理：综合

CiteScore

3.40

自引率

10.00%

发文量

275

审稿时长

3-8 weeks

期刊介绍： Indian Journal of Physics is a monthly research journal in English published by the Indian Association for the Cultivation of Sciences in collaboration with the Indian Physical Society. The journal publishes refereed papers covering current research in Physics in the following category: Astrophysics, Atmospheric and Space physics; Atomic & Molecular Physics; Biophysics; Condensed Matter & Materials Physics; General & Interdisciplinary Physics; Nonlinear dynamics & Complex Systems; Nuclear Physics; Optics and Spectroscopy; Particle Physics; Plasma Physics; Relativity & Cosmology; Statistical Physics.