un:spiral-and-irregular-galaxies
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| un:spiral-and-irregular-galaxies [2026/02/10 00:14] – [0.4 Surface Brightness Profile] shuvo | un:spiral-and-irregular-galaxies [2026/02/10 00:14] (current) – [0.4 Surface Brightness Profile] shuvo | ||
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| In this versatile model: (1) $n = 1$ yields the exponential disk profile, (2) $n = 4$ recovers the standard de Vaucouleurs law. | In this versatile model: (1) $n = 1$ yields the exponential disk profile, (2) $n = 4$ recovers the standard de Vaucouleurs law. | ||
| - | Finally, the **Holmberg radius** ($r_H$) and the isophotal radius $R_{25}$ (where the surface brightness reaches $25 \ mag arcsec^{-2}$ provide standardized benchmarks for comparing the physical extents of different galaxies regardless of their Hubble type. | + | Finally, the **Holmberg radius** ($r_H$) and the isophotal radius $R_{25}$ (where the surface brightness reaches $25 \ mag \ arcsec^{-2}$ provide standardized benchmarks for comparing the physical extents of different galaxies regardless of their Hubble type. |
un/spiral-and-irregular-galaxies.1770707647.txt.gz · Last modified: by shuvo