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Down-bending Breaks in Galactic Disks Are an Intrinsic By-product of Inside-out Growth

  • Authors: Liufei Chen, 柳霏 陈, Min Du, 敏 杜, Shuai Lu, 帅 卢, Jing Li, 静 李, Luis C. Ho

Liufei Chen et al 2026 The Astrophysical Journal Letters 1003 .

  • Provider: AAS Journals

Caption: Figure 2.

Kinematic and structural properties of type I (circles), type II (triangles), and type III (crosses) galaxies in the hRM plane. From left to right, the data points are color-coded by the ratio of break radius to inner disk scale length Rbreak/hR, rotational support κrot, stellar halo mass fraction fhalo, and ex situ stellar mass fraction fex-situ. In each panel, the symbol size scales with the corresponding color-coded quantity. The gray dashed, gray dotted, and black solid lines represent the linear fits to the hRM relation for type I, type III, and the total disk sample, respectively; shaded regions denote the 1σ fitting uncertainties. The error bars indicate the standard deviation of the residuals from the global linear fit.

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