تقرير
Halo Radius (Splashback Radius) of Groups and Clusters of Galaxies on small scales
العنوان: | Halo Radius (Splashback Radius) of Groups and Clusters of Galaxies on small scales |
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المؤلفون: | Kopylova, Flera G., Kopylov, Alexander I. |
المصدر: | Astrophysical Bulletin, 77, 22, 2022 |
سنة النشر: | 2024 |
المجموعة: | Astrophysics |
مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies |
الوصف: | We report the results of a study of the distribution of galaxies in the projection along the radius ($R \leq 3R_{200c}$) for 157~groups and clusters of galaxies in the local Universe (0.01 < $z$ < 0.10) with line-of-sight velocity dispersions~200~km~s$^{-1}$ < $ \sigma$ < 1100~km~s$^{-1}$. We introduce a new observed boundary for the halos of clusters of galaxies, which we identify with the splashback radius $R_{\rm{sp}}$. We also identified the core of groups/clusters of galaxies with the radius$R_c$. These radii are determined by the observed integrated distribution of the number of galaxies as a function of squared angular radius from the center of the group/cluster, which (usually) coincides with the brightest galaxy. We found for the entire sample that the boundary of dark matter $R_{\rm{sp}}$ for groups/clusters of galaxies is proportional to the radius $R_{\rm{200c}}$ of the virialized region. We measured the mean radius $\langle R_{\rm{sp}} \rangle = 1.14\pm0.02$~Mpc for groups of galaxies ($\sigma \leq 400$~km~s$^{-1}$) and $\langle R_{\rm{sp}} \rangle = 2.00\pm0.07$~Mpc for clusters of galaxies ($\sigma > 400$~km~s$^{-1}$). The mean ratio of radii is $\langle R_{\rm{sp}}/R_{\rm{200c}} \rangle = 1.40\pm0.02$}, or $\langle R_{\rm{sp}}/R_{\rm{200m}} \rangle = 0.88\pm0.02$. Comment: 15 pages, 7 figures, 2 tables. The article provides references to the X-ray luminosity of galaxy clusters and clarifies the descriptions of the columns |
نوع الوثيقة: | Working Paper |
URL الوصول: | http://arxiv.org/abs/2406.09806 |
رقم الأكسشن: | edsarx.2406.09806 |
قاعدة البيانات: | arXiv |
الوصف غير متاح. |